2008 Vol. 26, No. 3
Display Method:
2008, 26(3): 361-368.
Abstract:
Abstract Glutenite fans are the major sedimentary systems in the upper fourth member of Shahejie formation in Shengtuo area, and different turbiditic glutenites develop in the deep lacustrine environment. On the base of cores observation and description, combined with the numerous data of well logging, sedimentary characteristics are studied in the upper fourth member of Shahejie formation in Shengtuo area, and the hydrocarbon distribution is analysed. The results show that the prograded-type fan delta is the major sedimentary system in the downdropped block of contemporaneous fault in Shengtuo area. The gravity channel and slump develop simultaneously. The glutenite reservoirs successively distribute lithologic hydrocarbon reservoir,structural hydrocarbon reservoir,stratigraphic hydrocarbon reservoir from the central subsag to the marginal facies belt. The hydrocarbon distribution is controlled by sedimentary facies apparently. The variance of reservoir quality is obviously in different facies belt. The reservoir quality is the best in middle fans, and they are the favorable places for hydrocarbon accumulation. The slumps and gravity channels take second place. The oiliness quality of inner fans and outer fans are bad because of bad reservoir quality. In addition, the inherited deep subsag and the partition of lithology have effects on hydrocarbon distribution.
Abstract Glutenite fans are the major sedimentary systems in the upper fourth member of Shahejie formation in Shengtuo area, and different turbiditic glutenites develop in the deep lacustrine environment. On the base of cores observation and description, combined with the numerous data of well logging, sedimentary characteristics are studied in the upper fourth member of Shahejie formation in Shengtuo area, and the hydrocarbon distribution is analysed. The results show that the prograded-type fan delta is the major sedimentary system in the downdropped block of contemporaneous fault in Shengtuo area. The gravity channel and slump develop simultaneously. The glutenite reservoirs successively distribute lithologic hydrocarbon reservoir,structural hydrocarbon reservoir,stratigraphic hydrocarbon reservoir from the central subsag to the marginal facies belt. The hydrocarbon distribution is controlled by sedimentary facies apparently. The variance of reservoir quality is obviously in different facies belt. The reservoir quality is the best in middle fans, and they are the favorable places for hydrocarbon accumulation. The slumps and gravity channels take second place. The oiliness quality of inner fans and outer fans are bad because of bad reservoir quality. In addition, the inherited deep subsag and the partition of lithology have effects on hydrocarbon distribution.
2008, 26(3): 376-383.
Abstract:
Abstract On the base of the hypothesis of PAC which was presented by Goodwin and Anderson in 1985, considering the division of base-level cycles was extremely indefinite, this paper attached the autocyclicity and allocyclicity to the concepts of base-level cycle. The concept of the grain-size genetic unit and its research methods were put forward, and applied to establish high-resolution isochronous sequence framework of Loucaogou Formation of Middle Permian in Chaiwopu basin. There totally 2 long base-level cycle sequence, 6 middle-term grain-size genetic units, 5 members equal to 5 system tracts ,were distinguished from Loucaogou Formation of Middle Permian in Chaiwopu basin.
Abstract On the base of the hypothesis of PAC which was presented by Goodwin and Anderson in 1985, considering the division of base-level cycles was extremely indefinite, this paper attached the autocyclicity and allocyclicity to the concepts of base-level cycle. The concept of the grain-size genetic unit and its research methods were put forward, and applied to establish high-resolution isochronous sequence framework of Loucaogou Formation of Middle Permian in Chaiwopu basin. There totally 2 long base-level cycle sequence, 6 middle-term grain-size genetic units, 5 members equal to 5 system tracts ,were distinguished from Loucaogou Formation of Middle Permian in Chaiwopu basin.
2008, 26(3): 392-398.
Abstract:
Paleogene and Neogene in Southwest Qaidam Basin are the most important oil and gas exploration and development strata of the basin. Based on the detailed sequence stratigraphy study of 54 drilling and logging data, a first flooding surface and 6 maximum flooding surfaces were identified in Paleogene-Neogene Ganchaigou and Shizigou Formations, and these surfaces can be divided into 6 third-order sequences and 17 quasi-sequence groups. Sequence correlation was done in 10 well-to-well profiles. In corresponding to these well-to-well profiles, seismic profiles were sliced in 3D seismic data, and sequence boundaries were also identified in the seismic profiles. Then the identified sequences from well-to-well profiles were projected on seismic profiles, through correlation and adjustment, high-resolution Paleogene-Neogene drilling and seismic matching sequence stratigraphic framework was constructed in south-west Qaidam Basin. This work may give insights to explore lithologic oil and gas reservoirs in this area.
Paleogene and Neogene in Southwest Qaidam Basin are the most important oil and gas exploration and development strata of the basin. Based on the detailed sequence stratigraphy study of 54 drilling and logging data, a first flooding surface and 6 maximum flooding surfaces were identified in Paleogene-Neogene Ganchaigou and Shizigou Formations, and these surfaces can be divided into 6 third-order sequences and 17 quasi-sequence groups. Sequence correlation was done in 10 well-to-well profiles. In corresponding to these well-to-well profiles, seismic profiles were sliced in 3D seismic data, and sequence boundaries were also identified in the seismic profiles. Then the identified sequences from well-to-well profiles were projected on seismic profiles, through correlation and adjustment, high-resolution Paleogene-Neogene drilling and seismic matching sequence stratigraphic framework was constructed in south-west Qaidam Basin. This work may give insights to explore lithologic oil and gas reservoirs in this area.
2008, 26(3): 407-416.
Abstract:
2008, 26(3): 426-434.
Abstract:
The investigation on the coalbed methane system is a guide to the exploration and development of coalbed methane. Using the theory and method of unconventional petroleum system, the Sahai Formation coalbed methane system was studied. The source and reservoir rock is the third coal seams of Sahai Formation. The Sahai Formation coalbed methane is sealed by the roof comprising mudstone and lutite of the fourth Sahai Formation. The overburden is the fourth Sahai Formation and Fuxin Formation deposits. The dolerite intrusion during the Himalayan orogeny enhanced the coal maturity and caused a peak of hydrocarbon generation. In addition, the underwater brought many bacteria generating second biogenic methane. Then the coalbed methane is reserved and a critical moment of the coalbed methane system is at the end of the Late Tertiary. In summary, the Sahai Formation coal seams are favorable for coalbed methane exploration and the Dongliang district will to be a promising area for coalbed methane exploration.
The investigation on the coalbed methane system is a guide to the exploration and development of coalbed methane. Using the theory and method of unconventional petroleum system, the Sahai Formation coalbed methane system was studied. The source and reservoir rock is the third coal seams of Sahai Formation. The Sahai Formation coalbed methane is sealed by the roof comprising mudstone and lutite of the fourth Sahai Formation. The overburden is the fourth Sahai Formation and Fuxin Formation deposits. The dolerite intrusion during the Himalayan orogeny enhanced the coal maturity and caused a peak of hydrocarbon generation. In addition, the underwater brought many bacteria generating second biogenic methane. Then the coalbed methane is reserved and a critical moment of the coalbed methane system is at the end of the Late Tertiary. In summary, the Sahai Formation coal seams are favorable for coalbed methane exploration and the Dongliang district will to be a promising area for coalbed methane exploration.
2008, 26(3): 445-451.
Abstract:
The study of the characters and the influencing factors of the low permeable sandstone reservoirs relative permeability curve is not only the important approach to analyze and recognize the rule of oil and water fluid percolation, but also the base of proper development petroleum. By summarizing the futures of the relative permeability curve in low permeable reservoirs and study of the futures of relative permeability curve in lithic arenite which rock fragments are most come from tuff and lava, it is the reservoirs rock character, the type of detrital minerals, the degree of grains coarse and the lay out of clay mineral that are main influencing factors which influence the relative permeability curve. This conclusion has great significance in proper development in this kind of low permeable oil reservoirs.
The study of the characters and the influencing factors of the low permeable sandstone reservoirs relative permeability curve is not only the important approach to analyze and recognize the rule of oil and water fluid percolation, but also the base of proper development petroleum. By summarizing the futures of the relative permeability curve in low permeable reservoirs and study of the futures of relative permeability curve in lithic arenite which rock fragments are most come from tuff and lava, it is the reservoirs rock character, the type of detrital minerals, the degree of grains coarse and the lay out of clay mineral that are main influencing factors which influence the relative permeability curve. This conclusion has great significance in proper development in this kind of low permeable oil reservoirs.
2008, 26(3): 459-468.
Abstract:
The authigenic chlorite graincoatings or porelinings play an important role in preserving primary porosities effectively by resisting the compaction of the overlying rock and decreasing the number of nucleation of authigenic quartz on the surfaces of grains in reservoir sandstones of Xujiahe Formation, Sichuan basin, China. The early materials forming the graincoatings of chlorite are involving the solution of the syndepositional Fe rich sediments, flocculation of the soluble fluvial Fe and the intrusion of the compacting fluids in the adjacent shale bed. And moreover, the graincoatings mainly formed as news neomorphic precipitations between syngenesis and early eodiagenesis. Due to the Continuous intrusion of the Mgrich fluids through the fracture system ,the authigenic chlorites in Xujiahe Formation II are in possession of the enough materials to regrow in mesodiagenesis, furthermore, the contents of MgO are increasing with the increasing depths distinctly. However, in Xujiahe Formation IV sandstones, the regrowth of chlorite is not obvious. The impact of the chlorite graincoatings to the reservoir properties are well evaluated by the relation of the chlorite contents versus the porosity values and the porosity distribution figure in study area. As for the influence to reservoir quality, there is an "optimum thickness" for chlorite graincoatings to effectively preserve the porosities, but without radically decreasing permeability and increasing the microporosity in reservoirs. Within Xujiahe Formation sandstones, the optimum thickness of chlorite grims seems to between 5 μm and 10 μm.
The authigenic chlorite graincoatings or porelinings play an important role in preserving primary porosities effectively by resisting the compaction of the overlying rock and decreasing the number of nucleation of authigenic quartz on the surfaces of grains in reservoir sandstones of Xujiahe Formation, Sichuan basin, China. The early materials forming the graincoatings of chlorite are involving the solution of the syndepositional Fe rich sediments, flocculation of the soluble fluvial Fe and the intrusion of the compacting fluids in the adjacent shale bed. And moreover, the graincoatings mainly formed as news neomorphic precipitations between syngenesis and early eodiagenesis. Due to the Continuous intrusion of the Mgrich fluids through the fracture system ,the authigenic chlorites in Xujiahe Formation II are in possession of the enough materials to regrow in mesodiagenesis, furthermore, the contents of MgO are increasing with the increasing depths distinctly. However, in Xujiahe Formation IV sandstones, the regrowth of chlorite is not obvious. The impact of the chlorite graincoatings to the reservoir properties are well evaluated by the relation of the chlorite contents versus the porosity values and the porosity distribution figure in study area. As for the influence to reservoir quality, there is an "optimum thickness" for chlorite graincoatings to effectively preserve the porosities, but without radically decreasing permeability and increasing the microporosity in reservoirs. Within Xujiahe Formation sandstones, the optimum thickness of chlorite grims seems to between 5 μm and 10 μm.
2008, 26(3): 480-486.
Abstract:
Abstract Through systematic analysis of phytolith characteristics on the quaternary section at Sangda Village in Lhasa ,Tibet , such as morphological classification, combination character, warmth indexed, five assemblage zones can be distinguished as follows: the first combination of tooth model-smooth bar model ,chip model , muri block, reflecting a warm-cool climate; the second , rectangular model-smooth bar model and polyhedron model, reflecting the warmer climate; the third, rectangular model, tooth model-smooth and bar model , reflecting a drought climate; the fourth, rectangular model-dumbbell model, tooth model-smooth bar model and polyhedron model , indicating warm and damp climate ;and the fifth, tooth model, cap model- smooth bar model, polyhedron model and chip mode ,indicating a colder climate. The study of morphological classification and combination could be applied for probing into palaeoenvironment and paleo-vegetations of Quaternary in the Sangda village, Lhasa area
Abstract Through systematic analysis of phytolith characteristics on the quaternary section at Sangda Village in Lhasa ,Tibet , such as morphological classification, combination character, warmth indexed, five assemblage zones can be distinguished as follows: the first combination of tooth model-smooth bar model ,chip model , muri block, reflecting a warm-cool climate; the second , rectangular model-smooth bar model and polyhedron model, reflecting the warmer climate; the third, rectangular model, tooth model-smooth and bar model , reflecting a drought climate; the fourth, rectangular model-dumbbell model, tooth model-smooth bar model and polyhedron model , indicating warm and damp climate ;and the fifth, tooth model, cap model- smooth bar model, polyhedron model and chip mode ,indicating a colder climate. The study of morphological classification and combination could be applied for probing into palaeoenvironment and paleo-vegetations of Quaternary in the Sangda village, Lhasa area
2008, 26(3): 494-500.
Abstract:
The common pretreatment method has caused divergent results of grain size measurement of the fine loess samples. In order to understand effects of pretreated method on the fine-grain loess grain-size distribution, samples from three sits, which are located in Luochuan of central Chinese Loess Plateau, Lushi of southern margin of the Loess Plateau and Shangbaichuan of eastern Qingling Mountains in central China, were collected and pretreated under different ultrasonic dispersion conditions. The results indicate that time of ultrasonic disaggregating by the laser grain-size equipment just before measuring is very important for granulometry of the fine loess samples. On the basis of the different experiments, we recommend a new pretreatment method for the grain-size measurement for fine-grain loess samples: over 2 minutes are required for dispersing the samples by ultrasonic of the laser grain-size equipment just before measuring. This step is neglected in the previous measurement so that the divergent results are presented in granulometry of the fine loess samples. In addition, samples from a loess-paleosol section at Qiaojiayao of the southeast Loess Plateau are measured by the traditional and the new methods, respectively. The results show that our recommended pretreatment method is more reliable to obtain grain-size distribution of the fine-grain loess deposit than that of the older one.
The common pretreatment method has caused divergent results of grain size measurement of the fine loess samples. In order to understand effects of pretreated method on the fine-grain loess grain-size distribution, samples from three sits, which are located in Luochuan of central Chinese Loess Plateau, Lushi of southern margin of the Loess Plateau and Shangbaichuan of eastern Qingling Mountains in central China, were collected and pretreated under different ultrasonic dispersion conditions. The results indicate that time of ultrasonic disaggregating by the laser grain-size equipment just before measuring is very important for granulometry of the fine loess samples. On the basis of the different experiments, we recommend a new pretreatment method for the grain-size measurement for fine-grain loess samples: over 2 minutes are required for dispersing the samples by ultrasonic of the laser grain-size equipment just before measuring. This step is neglected in the previous measurement so that the divergent results are presented in granulometry of the fine loess samples. In addition, samples from a loess-paleosol section at Qiaojiayao of the southeast Loess Plateau are measured by the traditional and the new methods, respectively. The results show that our recommended pretreatment method is more reliable to obtain grain-size distribution of the fine-grain loess deposit than that of the older one.
2008, 26(3): 508-512.
Abstract:
The sediments hold information of, for example, phosphorus, which can be used to reconstruct the paleoecological and pollution history of the lakes and their drainage basins. In this paper, phosphorus forms in sediment cores from the Wuliangsuhai Lake and the Daihai Lake were extracted by a sequential extraction technique. The results indicate that the contents of AlP and ACaP in the Wuliangsuhai Lake are notably higher than those in the Daihai Lake. However, the contents of ExP, DeP and OrP in the Wuliangsuhai Lake are obviously lower than those in the Daihai Lake. The distribution of phosphorus forms can archive the information of eutrophication level and the palaeoenvironment and paleoclimate of the drainage basin of the two lakes located in different climatic regions. The contents of authigenic apatite, CaCO3bound P, and biogenic apatite (ACaP) and detrital apatite (DeP) can be used as effective parameters in the study of palaeoenvironment and paleoclimate.
The sediments hold information of, for example, phosphorus, which can be used to reconstruct the paleoecological and pollution history of the lakes and their drainage basins. In this paper, phosphorus forms in sediment cores from the Wuliangsuhai Lake and the Daihai Lake were extracted by a sequential extraction technique. The results indicate that the contents of AlP and ACaP in the Wuliangsuhai Lake are notably higher than those in the Daihai Lake. However, the contents of ExP, DeP and OrP in the Wuliangsuhai Lake are obviously lower than those in the Daihai Lake. The distribution of phosphorus forms can archive the information of eutrophication level and the palaeoenvironment and paleoclimate of the drainage basin of the two lakes located in different climatic regions. The contents of authigenic apatite, CaCO3bound P, and biogenic apatite (ACaP) and detrital apatite (DeP) can be used as effective parameters in the study of palaeoenvironment and paleoclimate.
2008, 26(3): 518-524.
Abstract:
The petroleum exploration degree of Tarim Basin is low, and the distinguished character and distribution of Lower Paleozoic source rock is still an important problem puzzling the geologist. By systematic analyses of drilled Cambrian source rock, geochemical character of Cambrian source rock was deeply studied.The result shows that owing to the difference of Cambrian depositional environment, the abundance of organic matter, the distribution of sterane and terpane and relative composition of dibenzothiophene, dibenzofuran, fluorine were varied apparently, and these parameters should be taken into account in oilsource correlation. As a whole, distinguished character of Cambrian source rock mainly include higher content of C28 in sterane, higher content of Gammacerane, and heavier carbon isotope ratios. The distribution of triaromatic hydrocarbon in Cambrian source rock is also different to Upper Ordovician source rock apparently.
The petroleum exploration degree of Tarim Basin is low, and the distinguished character and distribution of Lower Paleozoic source rock is still an important problem puzzling the geologist. By systematic analyses of drilled Cambrian source rock, geochemical character of Cambrian source rock was deeply studied.The result shows that owing to the difference of Cambrian depositional environment, the abundance of organic matter, the distribution of sterane and terpane and relative composition of dibenzothiophene, dibenzofuran, fluorine were varied apparently, and these parameters should be taken into account in oilsource correlation. As a whole, distinguished character of Cambrian source rock mainly include higher content of C28 in sterane, higher content of Gammacerane, and heavier carbon isotope ratios. The distribution of triaromatic hydrocarbon in Cambrian source rock is also different to Upper Ordovician source rock apparently.
Source and Accumulation Time of Condensates in Hongzhuang Oilfield, Qintong Sag, North Jiangsu Basin
2008, 26(3): 531-539.
Abstract:
Based on the characteristics of triaromatic steranes, alkyl triaromatic steranes and stable carbon isotopes, the sources of the condensates were analyzed in Paleogene in Hongzhuang Oilfield in Qintong Sag, Northern Jiangsu Basin. It shows that the condensates have not genetic affinity with Paleogene source rocks and were mainly sourced from the deep sources rock in Hongzhuang Oilfield. Based on the characterizations of hydrocarbon inclusions and homogenization temperatures, combining with the strata burial history, the time of hydrocarbon accumulation were confirmed in Ed1 reservoirs in Qintong Sag, North Jiangsu Basin. The result shows that cogenetic aqueous inclusions from quartz in sandstone in Well S245 show homogenization temperatures ranging from 80 to 110 ℃ and petroleum filling began Late Miocene, approximately 6 Ma ago.
Based on the characteristics of triaromatic steranes, alkyl triaromatic steranes and stable carbon isotopes, the sources of the condensates were analyzed in Paleogene in Hongzhuang Oilfield in Qintong Sag, Northern Jiangsu Basin. It shows that the condensates have not genetic affinity with Paleogene source rocks and were mainly sourced from the deep sources rock in Hongzhuang Oilfield. Based on the characterizations of hydrocarbon inclusions and homogenization temperatures, combining with the strata burial history, the time of hydrocarbon accumulation were confirmed in Ed1 reservoirs in Qintong Sag, North Jiangsu Basin. The result shows that cogenetic aqueous inclusions from quartz in sandstone in Well S245 show homogenization temperatures ranging from 80 to 110 ℃ and petroleum filling began Late Miocene, approximately 6 Ma ago.
2008, 26(3): 369-375.
Abstract:
Abstracts The Upper Devonian Xikuangshan Formation in Shilong, Liantang, Guiyang county, southeastern Hunan Province consists of limestones, dolomites, dolomitized limestones and lime dolomites of platform facies, in which typical tempestites develop. The criteria of storm deposits conclude bottom gutter casts，radial fabric of “wormkalk” calclrudite, hummocky or swaley cross bedding, parallel bedding, massive bedding and graded bedding. The tempestites consist of 4 types of lothofacies: A-“wormkalk” calclrudite with massive bedding and bottom gutter casts. B-“wormkalk” calclrudite with graded bedding. C-calcarenite with hummocky or swaley cross-bedding and parallel bedding. D- mudstone with homogeneous or horizontal bedding. These lithofacies constitute 4 types of depositional succession: A-D succession, A-C-D succession, B-C-D succession and B-D succession. The storm deposits indicate that southeastern Hunan locate in platform to shelf of low latitude zone（5º～20º）in the Late Devonian. The discovery of the storm deposits has important significance for the interpretation of the palaeoclimate of Devonian．
Abstracts The Upper Devonian Xikuangshan Formation in Shilong, Liantang, Guiyang county, southeastern Hunan Province consists of limestones, dolomites, dolomitized limestones and lime dolomites of platform facies, in which typical tempestites develop. The criteria of storm deposits conclude bottom gutter casts，radial fabric of “wormkalk” calclrudite, hummocky or swaley cross bedding, parallel bedding, massive bedding and graded bedding. The tempestites consist of 4 types of lothofacies: A-“wormkalk” calclrudite with massive bedding and bottom gutter casts. B-“wormkalk” calclrudite with graded bedding. C-calcarenite with hummocky or swaley cross-bedding and parallel bedding. D- mudstone with homogeneous or horizontal bedding. These lithofacies constitute 4 types of depositional succession: A-D succession, A-C-D succession, B-C-D succession and B-D succession. The storm deposits indicate that southeastern Hunan locate in platform to shelf of low latitude zone（5º～20º）in the Late Devonian. The discovery of the storm deposits has important significance for the interpretation of the palaeoclimate of Devonian．
2008, 26(3): 384-391.
Abstract:
Abstract The study about sequence stratigraphy in big sagged lacustrine basin have made a quiet great progress, but the study about sequence stratigraphy in Ordos big sagged lacustrine basin have made less progress. The reasons as follow: the trait of seismic data on Loess Plateau is bad; the logging data may be interpreted variedly; contrast in isochronous is difficult; and right method system has not been found. In this paper, authors put forward a new method system of studying sequence stratigraphic framework of big sagged lacustrine basin which include six parts: establishing standard from outcrop profiles, confirming grade of sequence from wavelet analysis, ascertaining sequence cycles from lake level changes, affirming mode from borehole logs, notarizing framework from seismic interpretation, and proposing scheme from the integration of outcrop profiles, borehole logs and seismic interpreted profiles. This method system has been applied to the projects about petroleum prospecting of Ordos Mesozoic Basin. Finally, we have established the sequence stratigraphic framework which adapts to divide and contrast stratigraphy in Ordos Mesozoic basin.
Abstract The study about sequence stratigraphy in big sagged lacustrine basin have made a quiet great progress, but the study about sequence stratigraphy in Ordos big sagged lacustrine basin have made less progress. The reasons as follow: the trait of seismic data on Loess Plateau is bad; the logging data may be interpreted variedly; contrast in isochronous is difficult; and right method system has not been found. In this paper, authors put forward a new method system of studying sequence stratigraphic framework of big sagged lacustrine basin which include six parts: establishing standard from outcrop profiles, confirming grade of sequence from wavelet analysis, ascertaining sequence cycles from lake level changes, affirming mode from borehole logs, notarizing framework from seismic interpretation, and proposing scheme from the integration of outcrop profiles, borehole logs and seismic interpreted profiles. This method system has been applied to the projects about petroleum prospecting of Ordos Mesozoic Basin. Finally, we have established the sequence stratigraphic framework which adapts to divide and contrast stratigraphy in Ordos Mesozoic basin.
2008, 26(3): 399-406.
Abstract:
Ｂｙｕｓｉｎｇｔｈｅｈｉｇｈｒｅｓｏｌｕｔｉｏｎｓｅｑｕｅｎｃｅｓｔｒａｔｉｇｒａｐｈｙｔｈｅｏｒｙ，ｔｈｒｏｕｇｈｄｅｐｏｓｉｔｉｏｎａｌｄｙｎａｍｉｃａｎａｌｙｓｉｓ，ｔｈｅｃｏｒｅｓ
ｏｆ１０ｗｅｌｌｓａｎｄ１２５６ｗｅｌｌｌｏｇｇｉｎｇｄａｔａ，ＰｕｔａｏｈｕａｒｅｓｅｒｖｏｉｒｏｆＳａｎｚｈａｏｄｅｐｒｅｓｓｉｏｎｉｎＳｏｎｇｌｉａｏｂａｓｉｎｉｓｄｉｖｉｄｅｄａｓ１
ｌｏｎｇｔｅｒｍｂａｓｅｌｅｖｅｌｃｙｃｌｅ，２ｍｅｄｉｕｍｔｅｒｍ ｂａｓｅｌｅｖｅｌｃｙｃｌｅｓ，１２ｓｈｏｒｔｔｅｒｍ ｂａｓｅｌｅｖｅｌｃｙｃｌｅｓ，ｐｒｏｐｏｓｅｄｍｉｄｄｌｅｆｌａｗ
ｎｏｎｂａｓｅｆｌａｗｓｅｑｕｅｎｃｅｆｏｒｍａｔｉｏｎｎｅｗｆｒａｍｅｗｏｒｋｗｉｔｈｔｈｅｓｅｄｉｍｅｎｔａｒｙｓｔｒｕｃｔｕｒｅｌｉｆｔｉｎｇｃｏｎｔｒｏｌｉｎｔｈｅｓｏｕｔｈｏｆＰｕｔａｏｈｕａ
ｒｅｓｅｒｖｏｉｒ．Ｔｈｒｏｕｇｈｔｈｅｓｔｕｄｙｏｆｒｅｓｅｒｖｏｉｒｄｅｐｏｓｉｔｉｏｎｃｈａｒａｃｔｅｒａｎｄｓｉｎｇｌｅｓａｎｄｂｏｄｙｄｉｓｔｒｉｂｕｔｉｏｎｌａｗｉｎｓｈｏｒｔｔｅｒｍｂａｓｅ
ｌｅｖｅｌｃｙｃｌｅ，ｉｔｉｓｒｅａｌｉｚｅｄｔｈａｔｔｈｅｓｕｂｍａｒｉｎｅｒｉｖｅｒｓａｎｄｂｏｄｙａｓＰｕｔａｏｈｕａｒｅｓｅｒｖｏｉｒｍａｉｎｒｅｓｅｒｖｏｉｒｃｏｕｒｓｅｉｓｃｏｎｔｉｎｕａｌ
ｔｈａｎｏｒｉｇｉｎａｌｕｎｄｅｒｓｔａｎｄｉｎｇ，ａｌｓｏｅｘｔｅｎｄｓｆａｒａｗａｙ，ｔｈｅｄｉｖｅｒｇｅｎｃｅｐｌａｉｎ，ｉｎｎｅｒｆｒｏｎｔｆａｃｉｅｓｂｅｌｔｓｏｕｔｈｍｏｖｅｍｅｎｔｒｅａｃ
ｈｉｎｇｔｏ３６ｋｍ，ｔｈｉｓｈａｓｉｍｐｏｒｔａｎｔｓｉｇｎｉｆｉｃａｎｃｅｔｏｋｎｏｗｒｅｓｅｒｖｏｉｒｔｙｐｅｓｉｎｔｈｉｓａｒｅａ，ｉｓｓｐｅｃｉａｌｌｙｈｉｇｈｗａｔｅｒｙｔｉｍｅｒｅｍａｉ
ｎｉｎｇｏｉｌｅｘｔｒａｃｔｉｏｎｐｏｔｅｎｔｉａｌ，ｈａｓｔｈｅｓｉｇｎｉｆｉｃａｎｔｉｎｆｌｕｅｎｃｅｏｎｉｎｓｔｒｕｃｔｉｎｇｌｉｔｈｏｌｏｇｉｃａｌｒｅｓｅｒｖｏｉｒｅｘｐｌｏｒａｔｉｏｎａｎｄｔｈｅｄｅｖｅｌ
ｏｐｍｅｎｔｉｎｔｈｅｎｏｒｔｈｂｌｏｃｋｏｆＳｏｎｇｌｉａｏＢａｓｉｎ．
Ｂｙｕｓｉｎｇｔｈｅｈｉｇｈｒｅｓｏｌｕｔｉｏｎｓｅｑｕｅｎｃｅｓｔｒａｔｉｇｒａｐｈｙｔｈｅｏｒｙ，ｔｈｒｏｕｇｈｄｅｐｏｓｉｔｉｏｎａｌｄｙｎａｍｉｃａｎａｌｙｓｉｓ，ｔｈｅｃｏｒｅｓ
ｏｆ１０ｗｅｌｌｓａｎｄ１２５６ｗｅｌｌｌｏｇｇｉｎｇｄａｔａ，ＰｕｔａｏｈｕａｒｅｓｅｒｖｏｉｒｏｆＳａｎｚｈａｏｄｅｐｒｅｓｓｉｏｎｉｎＳｏｎｇｌｉａｏｂａｓｉｎｉｓｄｉｖｉｄｅｄａｓ１
ｌｏｎｇｔｅｒｍｂａｓｅｌｅｖｅｌｃｙｃｌｅ，２ｍｅｄｉｕｍｔｅｒｍ ｂａｓｅｌｅｖｅｌｃｙｃｌｅｓ，１２ｓｈｏｒｔｔｅｒｍ ｂａｓｅｌｅｖｅｌｃｙｃｌｅｓ，ｐｒｏｐｏｓｅｄｍｉｄｄｌｅｆｌａｗ
ｎｏｎｂａｓｅｆｌａｗｓｅｑｕｅｎｃｅｆｏｒｍａｔｉｏｎｎｅｗｆｒａｍｅｗｏｒｋｗｉｔｈｔｈｅｓｅｄｉｍｅｎｔａｒｙｓｔｒｕｃｔｕｒｅｌｉｆｔｉｎｇｃｏｎｔｒｏｌｉｎｔｈｅｓｏｕｔｈｏｆＰｕｔａｏｈｕａ
ｒｅｓｅｒｖｏｉｒ．Ｔｈｒｏｕｇｈｔｈｅｓｔｕｄｙｏｆｒｅｓｅｒｖｏｉｒｄｅｐｏｓｉｔｉｏｎｃｈａｒａｃｔｅｒａｎｄｓｉｎｇｌｅｓａｎｄｂｏｄｙｄｉｓｔｒｉｂｕｔｉｏｎｌａｗｉｎｓｈｏｒｔｔｅｒｍｂａｓｅ
ｌｅｖｅｌｃｙｃｌｅ，ｉｔｉｓｒｅａｌｉｚｅｄｔｈａｔｔｈｅｓｕｂｍａｒｉｎｅｒｉｖｅｒｓａｎｄｂｏｄｙａｓＰｕｔａｏｈｕａｒｅｓｅｒｖｏｉｒｍａｉｎｒｅｓｅｒｖｏｉｒｃｏｕｒｓｅｉｓｃｏｎｔｉｎｕａｌ
ｔｈａｎｏｒｉｇｉｎａｌｕｎｄｅｒｓｔａｎｄｉｎｇ，ａｌｓｏｅｘｔｅｎｄｓｆａｒａｗａｙ，ｔｈｅｄｉｖｅｒｇｅｎｃｅｐｌａｉｎ，ｉｎｎｅｒｆｒｏｎｔｆａｃｉｅｓｂｅｌｔｓｏｕｔｈｍｏｖｅｍｅｎｔｒｅａｃ
ｈｉｎｇｔｏ３６ｋｍ，ｔｈｉｓｈａｓｉｍｐｏｒｔａｎｔｓｉｇｎｉｆｉｃａｎｃｅｔｏｋｎｏｗｒｅｓｅｒｖｏｉｒｔｙｐｅｓｉｎｔｈｉｓａｒｅａ，ｉｓｓｐｅｃｉａｌｌｙｈｉｇｈｗａｔｅｒｙｔｉｍｅｒｅｍａｉ
ｎｉｎｇｏｉｌｅｘｔｒａｃｔｉｏｎｐｏｔｅｎｔｉａｌ，ｈａｓｔｈｅｓｉｇｎｉｆｉｃａｎｔｉｎｆｌｕｅｎｃｅｏｎｉｎｓｔｒｕｃｔｉｎｇｌｉｔｈｏｌｏｇｉｃａｌｒｅｓｅｒｖｏｉｒｅｘｐｌｏｒａｔｉｏｎａｎｄｔｈｅｄｅｖｅｌ
ｏｐｍｅｎｔｉｎｔｈｅｎｏｒｔｈｂｌｏｃｋｏｆＳｏｎｇｌｉａｏＢａｓｉｎ．
2008, 26(3): 415-425.
Abstract:
According to the division of the scales of fluvial systems，the petroleum collective system in the Tertiary of Jiyang depression are devided into large ,middle and small scale. The petroleum collective system of different scale effected the formation of oil and gas field or oil and gas reservoir of different scales, at the same time, the petroleum collective system of different scale are determined by the sequence of different scales. The ways and the results of exploration in different scaled petroleum collective system of different scale are also different. So, according to the scales of the sequence and systems, the scales and types of oil and gas field or oil and gas reservoir can be predicted and explorated.
According to the division of the scales of fluvial systems，the petroleum collective system in the Tertiary of Jiyang depression are devided into large ,middle and small scale. The petroleum collective system of different scale effected the formation of oil and gas field or oil and gas reservoir of different scales, at the same time, the petroleum collective system of different scale are determined by the sequence of different scales. The ways and the results of exploration in different scaled petroleum collective system of different scale are also different. So, according to the scales of the sequence and systems, the scales and types of oil and gas field or oil and gas reservoir can be predicted and explorated.
2008, 26(3): 435-444.
Abstract:
Based on integrated study, the paper analyzed characteristics of the structure of weathered crust on the top of PreTertiary in the east part of Yihezhuang uplift of Jiyang depression. Key factors controlling its formation were anatomized, structure model of weathered crust was established, and its influence on petroleum migration and accumulation was discussed. Results show that weathered clay layer in the studied weathered crust is thin with limited distribution, and reservoir property is poor; while semiweathered rock of various lithologies extensively developed in the whole area, except for the tight “hard crust” on the top of semiweathered carbonate stone, reservoir property was improved obviously. Structure of weathered crust was controlled by lithofacies, paleoclimate, weathering time, paleotopography, tectonic structure, and later stage preservation. Reciprocal coupling of these factors determines spatial distribution of the structure of weathered crust. The weathered clay layer and “hard crust” on the top of semiweathered rock serves as caprock for petroleum reservoir, while semiweathered rock without “hard crust” can improve reservoir property of Tertiary system and serve as lateral migration path between different strata.
Based on integrated study, the paper analyzed characteristics of the structure of weathered crust on the top of PreTertiary in the east part of Yihezhuang uplift of Jiyang depression. Key factors controlling its formation were anatomized, structure model of weathered crust was established, and its influence on petroleum migration and accumulation was discussed. Results show that weathered clay layer in the studied weathered crust is thin with limited distribution, and reservoir property is poor; while semiweathered rock of various lithologies extensively developed in the whole area, except for the tight “hard crust” on the top of semiweathered carbonate stone, reservoir property was improved obviously. Structure of weathered crust was controlled by lithofacies, paleoclimate, weathering time, paleotopography, tectonic structure, and later stage preservation. Reciprocal coupling of these factors determines spatial distribution of the structure of weathered crust. The weathered clay layer and “hard crust” on the top of semiweathered rock serves as caprock for petroleum reservoir, while semiweathered rock without “hard crust” can improve reservoir property of Tertiary system and serve as lateral migration path between different strata.
2008, 26(3): 452-458.
Abstract:
Aiming at identifying microfacies belt of Main Framework Sandbody and filtering the relative high permeability, high production favorable oilbearing areas with extralow permeability reservoir in the middle of Shanbei Slope of Ordos Basin, it was presented that using Energy Thickness of Single Permeability Sand Bed controlled and classified optimum sedimentary microfacies belt. Information of depositional energy and its thickness in Single Permeability Sand Bed is extracted by multi logging response , in other words, maximum depositional energy and its thickness variation of Single Permeability Sand Bed with the relative high permeability could be reflected by the latitude, thickness, figure, contact relationship and secondary form of logging curve and data size, by which it is confirmed that development, the scale and distribution of the Framework Sandbody of the underwater distributary channel microfacies and channel overlying debouch bar microfacies of delta front subfacies, meanwhile, the mistakes are effectively overcome which resulted in failing to successful identifying accumulate thickness and microfacies belt of Main Framework Sandbody of thin sand and sandstone and mudstone interbedding of several similar origin in the studied reservoirs. Throuth the statistics of naturalpotential, natural gamma, density, neutron, interval transit time, resistivity log curve, and lithology, physical property and Energy Thickness in the studied layers, the cutoffs criterion of Energy Thickness of Single Permeability Sand Bed and the elimination criterion of interlayer were proposed, and the information of Single Permeability Sand Bed and its Energy Thickness was extracted in extralow permeability reservoirs Chang 4+511 in the studied areas, by which classification of favorable sedimentary microfacies belt and distribution of its framework sandbody could be controlled, and the relative high permeability, high production favorable oilbearing areas which are different types were predicated and filtered, which sketching the extend tendency, form, and feature between the river channel body areas and Hua Chi oil field in the southwest. The results can offer favorable target , important positions and well field for enlarging reservoirs and raising yield in the extralow permeability reservoirs.
Aiming at identifying microfacies belt of Main Framework Sandbody and filtering the relative high permeability, high production favorable oilbearing areas with extralow permeability reservoir in the middle of Shanbei Slope of Ordos Basin, it was presented that using Energy Thickness of Single Permeability Sand Bed controlled and classified optimum sedimentary microfacies belt. Information of depositional energy and its thickness in Single Permeability Sand Bed is extracted by multi logging response , in other words, maximum depositional energy and its thickness variation of Single Permeability Sand Bed with the relative high permeability could be reflected by the latitude, thickness, figure, contact relationship and secondary form of logging curve and data size, by which it is confirmed that development, the scale and distribution of the Framework Sandbody of the underwater distributary channel microfacies and channel overlying debouch bar microfacies of delta front subfacies, meanwhile, the mistakes are effectively overcome which resulted in failing to successful identifying accumulate thickness and microfacies belt of Main Framework Sandbody of thin sand and sandstone and mudstone interbedding of several similar origin in the studied reservoirs. Throuth the statistics of naturalpotential, natural gamma, density, neutron, interval transit time, resistivity log curve, and lithology, physical property and Energy Thickness in the studied layers, the cutoffs criterion of Energy Thickness of Single Permeability Sand Bed and the elimination criterion of interlayer were proposed, and the information of Single Permeability Sand Bed and its Energy Thickness was extracted in extralow permeability reservoirs Chang 4+511 in the studied areas, by which classification of favorable sedimentary microfacies belt and distribution of its framework sandbody could be controlled, and the relative high permeability, high production favorable oilbearing areas which are different types were predicated and filtered, which sketching the extend tendency, form, and feature between the river channel body areas and Hua Chi oil field in the southwest. The results can offer favorable target , important positions and well field for enlarging reservoirs and raising yield in the extralow permeability reservoirs.
2008, 26(3): 469-478.
Abstract:
The subject reservoir were deep buried reservoir rocks in the larger depth of the hinterland of Junggar Basin, with the depth from 5 500 to 6 000 m. A lot of thin sections were analyzed by standard petrographic microscope, Xray diffraction, scanning electron microscope coupled energydispersive analysis and cathodoluminescence were used to analyze the types and mechanism of secondary pores. The result shows that the secondary pores are main types in deepburied reservoirs. The CheMo ancient uplift was growing in Middle Jurassic. The result was that diagenesis was nonpersistent and the stratum was uplifted. Graintograin calcite cement had dissolution action by acidic atmospheric water and it had a lot of secondary porosity. The stratum was embedded after Cretaceous system and had dissolution action by organic acid. Diagenesis was delayed because the stratum was uplifted. The object reservoir was in A1 of late diagenetic stage that had caused secondary porosity remained.
The subject reservoir were deep buried reservoir rocks in the larger depth of the hinterland of Junggar Basin, with the depth from 5 500 to 6 000 m. A lot of thin sections were analyzed by standard petrographic microscope, Xray diffraction, scanning electron microscope coupled energydispersive analysis and cathodoluminescence were used to analyze the types and mechanism of secondary pores. The result shows that the secondary pores are main types in deepburied reservoirs. The CheMo ancient uplift was growing in Middle Jurassic. The result was that diagenesis was nonpersistent and the stratum was uplifted. Graintograin calcite cement had dissolution action by acidic atmospheric water and it had a lot of secondary porosity. The stratum was embedded after Cretaceous system and had dissolution action by organic acid. Diagenesis was delayed because the stratum was uplifted. The object reservoir was in A1 of late diagenetic stage that had caused secondary porosity remained.
2008, 26(3): 487-493.
Abstract:
Based on the grain-size analyses of representative section of Qingshan “sand-dune” in wuhan, the causes of “sand-dunes” is discussed in this paper. The results show as follows: Qingshan “sand-dune” mainly consists of sand with the average content over 59%, while 23% coarse silt and 11% fine silt approximately, only little in clay content. The characteristics of grain size parameters is same as typical sand dune, frequency distribution curves with two crests, and probability cumulative curves with a pattern of two segments, partly three, and high content of saltation load, closely resemble that of eolian sediments, C-M chart and statistical indices of grain size distribution different with fluvial sediment obviously, the discriminant analysis result is mingled with plus-minus. With a brief calculation, “sand-dunes” are fluvial sediment which outcropped in the last glaciation blown and conveyed by wind, then deposit in the south bank of Yangtze River.
Based on the grain-size analyses of representative section of Qingshan “sand-dune” in wuhan, the causes of “sand-dunes” is discussed in this paper. The results show as follows: Qingshan “sand-dune” mainly consists of sand with the average content over 59%, while 23% coarse silt and 11% fine silt approximately, only little in clay content. The characteristics of grain size parameters is same as typical sand dune, frequency distribution curves with two crests, and probability cumulative curves with a pattern of two segments, partly three, and high content of saltation load, closely resemble that of eolian sediments, C-M chart and statistical indices of grain size distribution different with fluvial sediment obviously, the discriminant analysis result is mingled with plus-minus. With a brief calculation, “sand-dunes” are fluvial sediment which outcropped in the last glaciation blown and conveyed by wind, then deposit in the south bank of Yangtze River.
2008, 26(3): 501-507.
Abstract:
Ｃｈａｎｇｅｓｉｎｓｅｄｉｍｅｎｔｇｒａｉｎｓｉｚｅａｒｅｍａｉｎｌｙｃｏｎｔｒｏｌｌｅｄｂｙｔｈｅｔｒａｎｓｐｏｒｔｉｎｇｍｅｄｉｕｍ，ｔｒａｎｓｐｏｒｔｉｎｇｍｏｄｅ，ｄｅｐ
ｏｓｉｔｉｏｎａｌｅｎｖｉｒｏｎｍｅｎｔ，ｃｌｉｍａｔｅａｎｄｏｔｈｅｒｆａｃｔｏｒｓ．Ｔｈｒｏｕｇｈａｎａｌｙｚｉｎｇｃｈａｒａｃｔｅｒｉｓｔｉｃｏｆｇｒａｉｎｓｉｚｅ，ｔｙｐｅｓｏｆｓｅｄｉｍｅｎｔｓｃａｎ
ｂｅｄｉｓｔｉｎｇｕｉｓｈｅｄ，ａｎｄｔｈａｔｃｈａｒａｃｔｅｒｉｓｔｉｃｏｆｔｈｅｓｅｄｉｍｅｎｔａｒｙｅｎｖｉｒｏｎｍｅｎｔｃａｎｂｅｃｏｎｃｌｕｄｅｄ，ｅｎｖｉｒｏｎｍｅｎｔａｌｅｖｏｌｕｔｉｏｎ
ｃａｎｂｅｉｎｔｅｒｐｒｅｔｅｄ．Ｉｎｔｈｉｓｐａｐｅｒ，ｔｈｅｓａｍｐｌｅｓｉｎｃｌｕｄｅｔｙｐｉｃａｌｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓ（２８２ｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔ
ｓａｍｐｌｅｓｆｒｏｍＬｏｐＮｕｒ，１２３ｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｍｐｌｅｓｆｒｏｍＤａｉｈａｉ）ａｎｄｔｙｐｉｃａｌｅｏｌｉａｎｌｏｅｓｓ（２６３ｓａｍｐｌｅｓｆｒｏｍ
Ｌａｎｚｈｏｕ）．Ｔｈｅｇｒａｉｎｓｉｚｅｃｈａｒａｃｔｅｒｉｓｔｉｃｐａｒａｍｅｔｅｒｓｏｆｔｈｅｓｅｓａｍｐｌｅｓａｒｅｏｂｔａｉｎｅｄｗｉｔｈｍｏｍｅｎｔｍｅｔｈｏｄ．Ｔｈｉｓａｒｔｉｃｌｅ
ｑｕａｎｔｉｔａｔｉｖｅａｎａｌｙｚｅｓｔｈｅｓｅｐａｒａｍｅｔｅｒｓｂｙｍｅａｎｓｏｆｄｉｓｃｒｉｍｉｎａｔｏｒｙａｎａｌｙｔｉｃａｌｍｅｔｈｏｄ．Ａｎｄｔｈｅｎｏｂｔａｉｎｅｄｄｉｓｃｒｉｍｉｎａｎｔ
ｆｕｎｃｔｉｏｎｏｆｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｎｄｔｙｐｉｃａｌｅｏｌｉａｎｓｅｄｉｍｅｎｔｓ：Ｆ（ｌａｋｅ，ｅｏｌｉａｎｓｅｄｉｍｅｎｔ）＝２０．３６３Ｍｚ５６．３７１Ｓｄ
６７．９２２Ｓｋ＋２３．５１６Ｋｇ５５．６２６，ｉｆＦ＞０，ｔｈｅｓｅｄｉｍｅｎｔｉｓｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔ；ｉｆＦ＜０，ｔｈｅｓｅｄｉｍｅｎｔｉｓｅｏｌｉａｎ
ｓｅｄｉｍｅｎｔ．Ｔｈｉｓｉｓａｇｏｏｄｑｕａｎｔｉｔａｔｉｖｅａｎａｌｙｓｉｓｔｏｔｈｅｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｎｄｅｏｌｉａｎｓｅｄｉｍｅｎｔｓｏｆｇｅｏｌｏｇｉｃａｌｈｉｓ
ｔｏｒｙ，ａｓｗｅｌｌａｓａｂａｓｉｓｆｏｒｄｉｓｔｉｎｇｕｉｓｈｅｏｌｉａｎｃｏｍｐｏｎｅｎｔｓｆｒｏｍｔｈｅｓｅｑｕｅｎｃｅｏｆｐａｌｅｏｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓ．Ａｎｄｉｔｉｓ
ｓｉｇｎｉｆｉｃａｎｔｆｏｒｔｈｅｉｎｖｅｓｔｉｇａｔｉｏｎｏｆｔｅｒｒｅｓｔｒｉａｌｐａｌｅｏｅｎｖｉｒｏｎｍｅｎｔｓ，ｄｒｏｕｇｈｔｅｖｅｎｔｓａｎｄｄｕｓｔｓｔｏｒｍｅｖｅｎｔｓ
Ｃｈａｎｇｅｓｉｎｓｅｄｉｍｅｎｔｇｒａｉｎｓｉｚｅａｒｅｍａｉｎｌｙｃｏｎｔｒｏｌｌｅｄｂｙｔｈｅｔｒａｎｓｐｏｒｔｉｎｇｍｅｄｉｕｍ，ｔｒａｎｓｐｏｒｔｉｎｇｍｏｄｅ，ｄｅｐ
ｏｓｉｔｉｏｎａｌｅｎｖｉｒｏｎｍｅｎｔ，ｃｌｉｍａｔｅａｎｄｏｔｈｅｒｆａｃｔｏｒｓ．Ｔｈｒｏｕｇｈａｎａｌｙｚｉｎｇｃｈａｒａｃｔｅｒｉｓｔｉｃｏｆｇｒａｉｎｓｉｚｅ，ｔｙｐｅｓｏｆｓｅｄｉｍｅｎｔｓｃａｎ
ｂｅｄｉｓｔｉｎｇｕｉｓｈｅｄ，ａｎｄｔｈａｔｃｈａｒａｃｔｅｒｉｓｔｉｃｏｆｔｈｅｓｅｄｉｍｅｎｔａｒｙｅｎｖｉｒｏｎｍｅｎｔｃａｎｂｅｃｏｎｃｌｕｄｅｄ，ｅｎｖｉｒｏｎｍｅｎｔａｌｅｖｏｌｕｔｉｏｎ
ｃａｎｂｅｉｎｔｅｒｐｒｅｔｅｄ．Ｉｎｔｈｉｓｐａｐｅｒ，ｔｈｅｓａｍｐｌｅｓｉｎｃｌｕｄｅｔｙｐｉｃａｌｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓ（２８２ｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔ
ｓａｍｐｌｅｓｆｒｏｍＬｏｐＮｕｒ，１２３ｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｍｐｌｅｓｆｒｏｍＤａｉｈａｉ）ａｎｄｔｙｐｉｃａｌｅｏｌｉａｎｌｏｅｓｓ（２６３ｓａｍｐｌｅｓｆｒｏｍ
Ｌａｎｚｈｏｕ）．Ｔｈｅｇｒａｉｎｓｉｚｅｃｈａｒａｃｔｅｒｉｓｔｉｃｐａｒａｍｅｔｅｒｓｏｆｔｈｅｓｅｓａｍｐｌｅｓａｒｅｏｂｔａｉｎｅｄｗｉｔｈｍｏｍｅｎｔｍｅｔｈｏｄ．Ｔｈｉｓａｒｔｉｃｌｅ
ｑｕａｎｔｉｔａｔｉｖｅａｎａｌｙｚｅｓｔｈｅｓｅｐａｒａｍｅｔｅｒｓｂｙｍｅａｎｓｏｆｄｉｓｃｒｉｍｉｎａｔｏｒｙａｎａｌｙｔｉｃａｌｍｅｔｈｏｄ．Ａｎｄｔｈｅｎｏｂｔａｉｎｅｄｄｉｓｃｒｉｍｉｎａｎｔ
ｆｕｎｃｔｉｏｎｏｆｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｎｄｔｙｐｉｃａｌｅｏｌｉａｎｓｅｄｉｍｅｎｔｓ：Ｆ（ｌａｋｅ，ｅｏｌｉａｎｓｅｄｉｍｅｎｔ）＝２０．３６３Ｍｚ５６．３７１Ｓｄ
６７．９２２Ｓｋ＋２３．５１６Ｋｇ５５．６２６，ｉｆＦ＞０，ｔｈｅｓｅｄｉｍｅｎｔｉｓｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔ；ｉｆＦ＜０，ｔｈｅｓｅｄｉｍｅｎｔｉｓｅｏｌｉａｎ
ｓｅｄｉｍｅｎｔ．Ｔｈｉｓｉｓａｇｏｏｄｑｕａｎｔｉｔａｔｉｖｅａｎａｌｙｓｉｓｔｏｔｈｅｓｔａｂｌｅｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓａｎｄｅｏｌｉａｎｓｅｄｉｍｅｎｔｓｏｆｇｅｏｌｏｇｉｃａｌｈｉｓ
ｔｏｒｙ，ａｓｗｅｌｌａｓａｂａｓｉｓｆｏｒｄｉｓｔｉｎｇｕｉｓｈｅｏｌｉａｎｃｏｍｐｏｎｅｎｔｓｆｒｏｍｔｈｅｓｅｑｕｅｎｃｅｏｆｐａｌｅｏｌａｃｕｓｔｒｉｎｅｓｅｄｉｍｅｎｔｓ．Ａｎｄｉｔｉｓ
ｓｉｇｎｉｆｉｃａｎｔｆｏｒｔｈｅｉｎｖｅｓｔｉｇａｔｉｏｎｏｆｔｅｒｒｅｓｔｒｉａｌｐａｌｅｏｅｎｖｉｒｏｎｍｅｎｔｓ，ｄｒｏｕｇｈｔｅｖｅｎｔｓａｎｄｄｕｓｔｓｔｏｒｍｅｖｅｎｔｓ
2008, 26(3): 513-517.
Abstract:
The stable oxygen and carbon isotope of biological shell carbonate have been extensively applied in the palaeoclimatology and palaeoenvironmental research. When measured the isotope composition of shell in situ, the different isotope composition between different shell cross sections will affect the environment significance judgement of shell isotope and have the adverse effect on the environment information extraction. This article has investigated carbon and oxygen isotope of the corbicula shell, the results shows that the carbon isotope profiles not obvious change in different cross sections, therefore it can not consider the difference between cross sections, and can extend the length of sample path in the sample process to obtain the enough powder to determine the carbon isotope. However, the oxygen isotope profiles exist difference between cross sections, so it should consider the difference oxygen isotope composition between cross sections, and in the sample process, the length of sample path should control in certain scope. Finally, according to the isotope difference between cross sections, the article had determined how to select the study cross section during the analysis of the shell.
The stable oxygen and carbon isotope of biological shell carbonate have been extensively applied in the palaeoclimatology and palaeoenvironmental research. When measured the isotope composition of shell in situ, the different isotope composition between different shell cross sections will affect the environment significance judgement of shell isotope and have the adverse effect on the environment information extraction. This article has investigated carbon and oxygen isotope of the corbicula shell, the results shows that the carbon isotope profiles not obvious change in different cross sections, therefore it can not consider the difference between cross sections, and can extend the length of sample path in the sample process to obtain the enough powder to determine the carbon isotope. However, the oxygen isotope profiles exist difference between cross sections, so it should consider the difference oxygen isotope composition between cross sections, and in the sample process, the length of sample path should control in certain scope. Finally, according to the isotope difference between cross sections, the article had determined how to select the study cross section during the analysis of the shell.
2008, 26(3): 525-530.
Abstract:
It is controversial about the origin of the natural gas in Minfeng area. By using thermal simulation experiment of the sealed system, the genetic mechanism of Eocene source rocks and oils are discussed in the generation process of hydrocarbon, the generation kinetics of the gas and some individual hydrocarbon. The result shows that the activation value of oil cracking is 30 kJ/mol higher than the thermolysis of source rocks. At the mature phase, the cracking gas from source rock contains less aromatic hydrocarbons and cycloparaffinic hydrocarbons. In view of above, natural gases in Minfeng area is mainly from Eocene source rocks.
It is controversial about the origin of the natural gas in Minfeng area. By using thermal simulation experiment of the sealed system, the genetic mechanism of Eocene source rocks and oils are discussed in the generation process of hydrocarbon, the generation kinetics of the gas and some individual hydrocarbon. The result shows that the activation value of oil cracking is 30 kJ/mol higher than the thermolysis of source rocks. At the mature phase, the cracking gas from source rock contains less aromatic hydrocarbons and cycloparaffinic hydrocarbons. In view of above, natural gases in Minfeng area is mainly from Eocene source rocks.
