Advanced Search

2006 Vol. 24, No. 2

Sedimentary Responses to Late Cenozoic Thrusting and Strikeslipping of Longmen Shan along Eastern Margin of Tibetan Plateau
LI Yong
2006, 24(2): 153-164.
Abstract:
Chengdu basin developed ahead of Longmen Shan along the eastern margin of Tibetan Plateau, lying between the Longmen Shan and Longquan Shan, and extends from southwest to northeast with the long axis of the basin parallel to Longmen Shan. The filling in the basin with a maximum thickness of 541m include Dayi conglomerate, Yaan gravel layer and Late Pleistocene and Holocene gravel layer. In the transverse section of the basin(vertical to Longmen Shan), the wedge shaped sediments in the basin were derived from Longmen Shan and gradually northwestwards thickening, the depocenter is located in the northwestern part of the basin. As thrusting progressed southeastwards, the northwestern margin and the depocenter of the basin had been progressively migrated southeastwards. According to this evidence, it can be inferred that the direction of trusting and tectonic shorting was from NWSE and vertical to Longmen Shan. In the longitudinal section (parallel to Longmen Shan), there are many minor echelon depressions and uplifts, as dextral strikeslipping progressed northeastwards, the minor depression (rhombocham) and fan had been progressively migrated northeastwards. According to these lines of evidence, we can infer that the direction of dextral strikeslipping was from SWNE and parallel to Longmen Shan. So we draw a conclusion that the Chengdu basin is one of typical transpressional basin controlled by thrusting and strikeslipping along Longmen Shan since 3.6Ma.
Tectonic Significance and Sedimentary Characteristics of Turbidity Successions Within the Cambrian Huqiao Formation at Wangcun Section in the West Hunan, South China
ZUO Jingxun
2006, 24(2): 175-184.
Abstract:
Cambrian System at Wangcun section, west Hunan Province, represents typical sedimentary successions on the Jiangnan Slop Belt. Traditionally, the Lower Cambrian Series at the Wangcun section is divided into Balang Formation, Qingxudong Formation; the Middle Cambrian is divided into Aoxi Formation as well as the lower member of Huqiao Formation, and the Upper Cambrian Series is divided into the upper member of Huqiao Formation and Zhuitun Formation. Formingstage of turbidity sediments within the Huqiao Formation can be attributed to seven longterm periods. The first turbidity succession in the Huqiao Formation includes 69 cycles that are attributed to 11 parasequences. The second turbidity succession in the Huaqiao Formation includes 37 cycles that are attributed to 7 parasequences. Lower part of each parasequence consists of initiated turbidity sediments, and the upper part of each parasequences consists of distal turbidity sediments. A gradual rise in sea level can be deduced based on the marine sediments within each parasequence. The first turbidity succession formed during the sealevel rising period consists of transgression system. However, the second turbidity succession deposited on the relatively steeper slope during the low sealevel period forms the low water system. The LowerMiddle Cambrian turbidity succession frequently deposited on the Jiangnan Slope Belt suggesting that periodic activities existed during the formation of deepfault along the margin of carbonate Platform.
Diagenetic Facies Analysis and HighQuality Reservoir Prediction in the Southern Xibu Depression of the Bohaiwan Basin
MENG Yuanlin
2006, 24(2): 185-192.
Abstract:
There exist three secondary porosity zones vertically in the Cenozoic reservoirs of the Southern Xibu Depression of the Bohaiwan Basin as revealed by the measured porosity data,thin sections,blue epoxy resinimpregnated thin sections and scanning electron microscopes. As a result,the highquality reservoirs are developed. Sedimentary microfacies and diageneses control the formations and occurrences of the highquality reservoirs, which are dominantly formed in the channel mouth bar, braided channel and channel bar deposits, located in the early diagenetic stage B~middle diagenetic stage A1〖KG*2〗and dissolution diagenetic facies. The diagenetic stages and diagenetic facies are predicted by modeling the paleotemperature, vitrinite reflectance, sterane isomerization rate and authigenic quartz concentration in space and time. The highquality reservoirs of the third middle member of Shahejie Formation are delineated by superposing the diagenetic facies map on the microfacies map. They are mainly in the middle part of the slop of the Southern Xibu Depression.
The Formation of Carbonate Breccia in Shulu Depression
QIU Longwei
2006, 24(2): 202-209.
Abstract:
Breccia in Shulu depression was found in the middle and low of the third segment of Shahejie Formation, it is a breccia with carbonate fragment as its main constituent, and distributes skirt-shapely on slopes in the depression. Breccia and marlstone with breccia are familiar breccias in the area and the former is domestic. Grain and matrix in the breccia are mainly angular and subangular carbonate clastic particles, whose parent rock were carbonate stratum of Ordovician. Mainly grain support, massive structure, infrequent graded bedding and others bedding, un-sorting of detrital grains and thicker breccia layer are important features of carbonate breccia in Shulu depression. Characteristics of component, fabric, structure and geologic background all reveal that the breccia in the study area is inviscous debris flow sediment of terrestrial formation. 
Characteristics and Genetic Analysis on Algal Limestone Reservoirs, Nanyishan, Western Qaidam Basin
REN Xiaojuan
2006, 24(2): 217-222.
Abstract:
This research is systematically related to the characteristics and genetic analysis of algal limestones reservoirs, Nanyishan, Qaidam basin. The results show that: 1) Though the water environment of Nanyisan is more muddy than others, algal can still grow; 2) The composition and rock type of the algal limestone are complex, the main rock types include lettucelike stromatolites, algal reef, digitate stromatolies, wavelike stromatolites and so on; 3) The deposits of algal limestones were formed in lowenergy peritidal to subtidal highenergy environment of lakeshore slopes, sliding under the action of gravity and some other factors and become slump Mixosedimentite layers; 4) The physical property of algal limestones layers is better than others; 5)The genetic development of the sediment decides that the single deposit is small, distributive and thinlayed.
The Application of MATLAB in Calculation of Mineral Contents in Clastic Sedimentary Rocks
LIU Fei
2006, 24(2): 229-234.
Abstract:
The calculation of mineral contents in rocks is an important basal work in geochemistry and petrology. The traditional methods mainly depend on microscopeobservation and programme calculation, which are useful when the mineral compositions are simple, but these methods will be inefficient when the mineral contents are complex. This paper presents the Nonnegative linear least square method of MATLAB-a quick and precise method of calculating mineral contents of detrital rocks with some examples. The results show that it's more accurate and quick to use MATLAB than other methods. Simultaneously, when use MATLAB, pay attention to choosing the appropriate data to ensure the authenticity of the results.
Ordovician Cephalopoda Biofacies and Their Provincialization in the South China
XIAO Chuantao
2006, 24(2): 242-250.
Abstract:
Based on studies of ecological characteristics of Ordovician Cephalopod from the southern China, Eighteen Cephalopod biofacies are recognized and described: 1.Open platform [WTBX]Proterocameroceras[WT] biofacies, 2. Restricted platform [WTBX]PseudoectenolitesXiadongoceras[WT] biofacies, 3. Open platform [WTBX]RetroclitendocerasPararetroclitendoceras[WT] biofacies, 4. Open platform [WTBX]Pronajaceras Mamagouceras[WT] biofacies, 5. Shelf slopebasin [WTBX]Cyclostomiceras[WT] biofacies, 6. Open platform [WTBX]CamerocerasCyrtovaginoceras
HighResolution Sequence Stratigraphy of Shanxi Formation(Permian) in Northwestern Portion of Ordos Basin
LIANG Jiwei
2006, 24(2): 251-258.
Abstract:
Highresolution sequence stratigraphy division of Shanxi Formation in northwestern part of Ordos basin has been put forward according to principle〖KG*2〗of base level cycle based on 4 outcrops and 35 core description and 305 well logs. As a component of longterm baselevel decreasing cycle, Shanxi Formation constitutes a mediumterm cycle, which can be subdivided into 5 shortterm cycles in ascending order(SSC1,SSC2,SSC3,SSC4,SSC5). Based on the sequence structure, and stack style and space variation, the highresolution sequence stratigraphy correlation framework〖KG*2〗is established to discuss sedimentary facies styles and controlling factors and physical〖KG*2〗property. The most favorable reservoir bodies were formed during early stage of semiascending cycle of short-term baselevel cycle. Reservoir bodies are mainly composed of delta plain distributary channel and delta front subaqueous channel. Here, the monofactor mapping method is adopted to study space distribution of the reservoir〖KG*2〗bed.
Grain Size Distribution Characteristics of Different Geogenetic Types of Sandy Desertification and Their Geological Significance in Southeast Mo Us Desert
LI Zhipei
2006, 24(2): 267-275.
Abstract:
Sandy desertification in southeast Mo Us desert and its neighboring regions, according to their material origins〖KG*2〗and physiographic〖KG*2〗characteristics, can be classified into four types, sandy land insitu type, flow valley in situ type, weathered residual insitu type and finally the wind drifted type. The sands of sandy desertification of sandy land insitu type come from both palaeoaeolian〖KG*2〗sand and those of paleoor modern fluvial or lacustrine facies. Sands of this type of desertification have the characteristics such as coarse grain, of which mid grain size are between 200-300μm or even bigger than 1mm, lower standard〖KG*2〗deviation, and narrow and positive leaning distribution〖KG*2〗patterns. Researches on grain size parameters show that their formation environment is likely fluvial. 
Sandy desertification of valley insitu type distributes mainly in river valleys and their neighbored regions, such as flood beds, terraces and nearby districts. Sands of this type may have varieties of sources, such as modern and paleo fluvial or flooded sediments Quaternary Epoch.
Sands of this type have the characteristics of broad range mid grain size (40-445μm), middle degree of sorting, narrow and positive leaning distribution patterns. These features suggest that the sands of river valley type desertification are mixtures of different geologic processes, mainly fluvial and aeolian.
Weathered residual insitu type desertification are formed by the erosion and separation by wind and fluvial forces of any sediments occurred in the region. During this process, fine grains become less and less, coarse grains remained. This type of sandy desertification mainly occurred in the north part of loess plateau. Their sands may come from paleoaeolian sands, sandy loess, paleosols as well as paleofluvial terrace sediments. Reactive paleoaeolian sands have the characteristics of both homogeneous in limited areas and features of different layers. Palaeoaeolian sands have twograin grades in the studied area, of which average grain size are between 23-60μm and 152-202μm respectively. They also have narrow, positive leaning distribution curves. 
Wind drifted sandy desertification have the characteristics such as coarse grained sands (140-310μm), low clay contents ( <5% ), and very narrow and positive leaning distribution curves. This suggests that they are the products of modern windblown sands.
For the purpose of combating sandy desertification of different genetic type, it is important that different protect and renovate measurements should be used. It is strongly suggested that using the methods of seeding grasses and manpower projects to fix the drifting sands during combating sandy land insitu desertification. As for the river valley in situ desertification, the methods of reducing soil erosion, protecting terraces and flood beds should be firstly used.
To deal with the weathered residual desertification, methods of reducing water and wind erosion protecting finegrain materialsfrom losses can be used, such as reducing herding, vegetation and plantation. Finally, for combating wind drifted sandy desertification, manpower projects can be used to reduce wind harm and organic measurements to increase the percentage of coverage.
Comparison of Simulation Results from the Closed and Open Experimental Systems and Its Significance
LU Shuangfang
2006, 24(2): 282-288.
Abstract:
Four〖KG*2〗organic〖KG*2〗samples in〖KG*2〗Songliao basin〖KG*2〗are simultaneously tested〖KG*2〗in the closedsystem of autoclave isothermal hydrous pyrolysis experiment and opensystem of RockEval constant heating rate pyrolysis experiment, separately. Based on the latter experimental data, the chemical kinetic models are calibrated and then the generation rates of oil and gas under the same conditions as the former autoclave experiment are calculated from the models calibrated. The results show that it is more accurate to measure the liquid oil product by the online measurement of RockEval than the autoclave experiment that needs extraction and a constant weight because of no light hydrocarbons (C6—C13) missing in the constant heating rate experiment, and clearly, it provides an effective way to measure the light hydrocarbons (C6—C13) that are difficult to measure in the thermal simulation experiment but significant to evaluate the amount of hydrocarbon generation. Simultaneously, this method can avoid gas leakage influencing gas generation rate accuracy in the autoclave experiment. It is possibly indicated that it is not only feasible to use the chemical kinetic〖KG*2〗model calibrated by the experiment data to calculate〖KG*2〗the hydrocarbon generation rate, but also more accurate.
Geochemical Characters Recognition for Steranes and Hopanes from Oils of Tahe Oilfield
NAN Qingyun
2006, 24(2): 294-299.
Abstract:
Biomarker is one of the most effective tools in the study of oilsource correlation gasoil maturity and gasoil migration. By using biomarker GC, GC—MS analysis techniques, the geochemical characters of steranes and hopanes from crude oils of Tahe oil field were investigated in this paper. The study shows〖KG*2〗Tahe oilfield is a compound oil reservoir, which is composed of later generated oils with high maturity lighter biodegradation and earlier〖KG*2〗generated oils with low maturity stronger biodegradation. The characters of C27—C29〖KG*2〗steranes and hopanes series indicate oils with varied maturities generated from the same sort of mother materials. The threedimensional diagram〖KG*2〗formed by Ts/(Tm+Ts),〖KG*2〗rearrangedsterane/sterane and ββ/(ββ+αα)C29〖KG*2〗shows that the migration direction of crude oil is from south to north, which confirms the opinion that oil and gas of Tahe oilfield mainly came from Manjiar Depression——an area to the south of Tahe oilfield.
盆地域成岩作用及储层形成演化
Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting
ZHANG Yuxiu
2006, 24(2): 165-174.
Abstract:
Onehundredandfiftyfour Mesozoic sandstone samples from the Qiangtang block (ca. 33°~35°N, 85°~93°E) were conducted for analysis of detrital modes, in an attempt to evaluate their provenance and the type of tectonic setting in which they were deposited. The LowerMiddle Triassic sandstones (Q61±8F27±13L12±10, Qm59±8F28±13Lt13±9, Qp28±22Lvm72±22Lsm0±0) in central Qiangtang are characterized by complex derivations from both recycled orogen and continental block provenances. The most of the Upper Triassic (Q78±12F7±7L15±11, Qm77±12F7±7Lt16±11, Qp16±11Lvm30±35Lsm54±33), Lower Jurassic (Q83±20F2±2L15±22, Qm79±23F2±2Lt19±24, Qp35±19Lvm0±0 Lsm65±19), Middle Jurassic (Q69±22F6±6L24±25, Qm67±22F6±6Lt26±24, Qp14±22Lvm32±38Lsm54±38), and Upper Jurassic (Q80±17F6±4L14±17, Qm78±17F6±4Lt16±16, Qp17±23Lvm27±35Lsm56±34) sandstones are dominated by recycled orogen origin. However, the sandstones that were derived from continental block source also exist in the southern margin of southern Qiangtang and in the Lower Jurassic strata in the southern margin of northern Qiangtang. It could have contained abundant ophiolitic fragments and other readilydecomposed ferromagnesian minerals across the entire anticlinorium. These mafic minerals point to the presence of the Shuanghu suture along the entire central Qiangtang anticlinorium and the blueschistbearing metamorphic complexes in central Qiangtang could be accommodated in a largescale enclave in an irregular central Qiangtang continental margin. The distribution of Mesozoic recycled orogenderived sandstones on Qiangtang indicates a contraction background, supporting〖KG*2〗a tensile mechanism for backarc spreading along the BangongNujiang belt. 
沉积与能源、矿产
Origin and Evolution of the Hydrodynamics in Sedimentary Basins——A case study of the Songliao Basin
LOU Zhanghua
2006, 24(2): 193-201.
Abstract:
Origin and evolution of the hydrodynamics has important relationship with the migration and accumulation of petroleum in sedimentary basins. The hydrodynamics made of several hydrodynamic systems in the Songliao basin is asymmetrical obviously, with the characteristics of gravityinduced centripetal flow recharged by meteoric water mainly at its northern and northeastern regions, centrifugal flow and crossformational flow at the basin center area, as well as crossformational flowevaporation at its southern area. And every hydrodynamic unit of the hydrodynamics in the Songliao basin has its own characters in aspects of stratum pressure, the waterflow direction, potential level and vertical pressure grads. Meanwhile, the origin and evolution of the hydrodynamics is characterized by stages, and its intensity has the property of vertical zonation, with the depth increasing, strong, weak and stagnant waterzones could be divided.
Analysis on the Lithofacies and Paleogeography of Fengtai Group in the Southeast North China Block
CAO Gaoshe
2006, 24(2): 210-216.
Abstract:
Fengtai Formation sedimented at the transition phase of Sinian and Cambrian has important meanings to confirm the sedimentary and tectonic circumstances of this transition phase by analyzing the lithofacies and paleogeography of this Formation. The lithofacies of Fengtai Formation mainly consist of silty mudstone facies contained phosphate concretions, blocky conglomerate facies, layered(coarsely layered) conglomerate facies, lens-shaped lithic greywacke facies contained gravels and arenaceous conglomerate facies, layered lithic greywacke (contained gravels)facies, rhythmically laminated lithic greywacke facies, which assembly bears the sedimentary model of submarine fan.The microfacies of Fengtai Formation mainly consist of conglomerate and lithic greywacke microfacies contained pyrites, lithic greywacke microfacies with neddle-like ring edge structure, breccias microfacies, lithic greywacke microfacies with reverse grading, which assembly bears the features of continental margin. Based on the above and the feature of sedimentary distribution,Fengtai Formation collectively is channel deposition of submarine fan which is similar to submarine canyon at high-angle continent edge probably generated by fault movement. 
Overview of the Researches on Sedimentary Environment for Sandstonetype Uranium Deposits in the MesoCenozoic Basins of China
CHEN Daisheng
2006, 24(2): 223-228.
Abstract:
This paper overviews the sedimentary environment for the sandstonetype uranium deposits in China, analyzes the situation and significance of these researches in this field, types of Ubearing clastic sedimentary Formations, and favorable facies for the formation of sandstonetype uranium deposits as well. Several aspects, which should be paid attention to during the study of the sedimentary environment for sandstonetype uranium deposits, are put forward finally.
Formation of Late Neoproterozoic Cap Carbonates and Termination Mechanism of “Snowball Earth”
FENG Dong
2006, 24(2): 235-241.
Abstract:
The Earth's most severe glaciation is considered to have occurred about 635 million years ago, in the late Neoproterozoic era, and is believed to have engulfed the entire earth under ice to create what came to be described as “Snowball Earth”. Carbonate rocks directly and ubiquitously overlie Neoproterozoic glacial diamicrites on almost every continent, and are commonly referred to as “cap carbonates”. Their unusual facies and strongly negative carbon isotopic signature stirred up considerable debates in the academic community, as they wonder how cap carbonates could have formed, thus “Snowball Earth” and “Methane Seep” were hypothesized. The “Snowball earth” hypothesis can explain many phenomena related to the Neoproterozoic glaciations, cap carbonates have been controversially ascribed to the aftermath of almost complete shutdown of the ocean ecosystems for millions of years during such ice ages.Conversely, it has also been suggested that these carbonate rocks were the result of destabilization of methane hydrates during deglaciation and concomitant flooding of continental shelves and interior basins. Recent carbon isotopic data of cap carbonates (δ13C as low as -41‰) provides direct evidence for methane-influenced process during deglaciation, strongly supported〖KG*2〗“Methane Seep” hypothesis.
层序域成岩作用与储层分布
Application of Highresolution Sequence Stratigraphy to the Sand Reservoir Prediction for 8th Member of Lower Shihezi Formation in Sulige Gas Field, Ordos Basin
YE Tairan
2006, 24(2): 259-266.
Abstract:
The highresolution sequence stratigraphy theories and technologies are widely used in the exploration and exploitation of subtle lithologic gas reservoir, taking it as a direction ,through dynamic analysis on baselevel cycle structure and stacking pattern , combined with the comprehensive studies of outcrops, cores and well logs,two longterm, five middleterm and fourteen shortterm cyclic sequences from the lower Shihezi Formation of Su 6 well area in Sulige gas field are classified. the structure types, sedimentary cycles, stacking patterns of shortterm, middleterm, longterm cyclic sequences and the relationship between cyclic sequences and distribution of favoring sand are discussed in detail. A chronostratigraghic framework is established by reference to the longterm and middleterm cycle sequences, in which the characteristics of different type of sand are discussed in detail. Based on the division and correlation of individualsandbody correspond to shortterm cyclic sequence,directing by the method of lithofaciespaleogeographical mapping, the sedimentary facies and sand distribution maps of the short or middleterm cyclic sequences come into being , the distribution of favoring sand reservoir can be predicted.
现代沉积与环境
A Correlation between Magnetic Susceptibility and the Content of Different Grain Sizes of XH1# Core in North Jiangsu Basin and Its Significance
SHU Qiang
2006, 24(2): 276-281.
Abstract:
Based on the synthetic study on the correlations between magnetic susceptibility and the content of the different grain size〖KG*2〗of XH1# core in northern Jiangsu basin, this paper shows that the correlation is different〖KG*2〗in various depth: 350~247m, the mass susceptibility correlates negatively with〖KG*2〗mid-grain sizes, but correlates positively with the content〖KG*2〗of 4~12Φ; 234~0m, the mass susceptibility correlates positively with〖KG*2〗mid-grain sizes, and correlates positively with the content〖KG*2〗of 1~3Φ; The depth of 247~234m is the transition period of the transform of the correlations between magnetic susceptibility and the content of the different grain size.〖KG*2〗The results of environmental magnetism research〖KG*2〗show that the components〖KG*2〗of magnetic mineral are also different〖KG*2〗in the upper stratum(234~0m) and the lower stratum(350~247m). The difference〖KG*2〗of the correlations between magnetic susceptibility and the content of the different grain size,〖KG*2〗and the components〖KG*2〗of magnetic mineral in various depth reveal that, in the course〖KG*2〗of the sediment deposition in the depth 247~234m, one great event may have happened in Northern Jiangsu Basin, this event led to the change of detrital sediment〖KG*2〗origin.
油气地质地球化学
Analysis of the Controls on Lithologic Oil Reservoir in Linyi Subsag, Huimin Sag
ZHANG Xiaoli
2006, 24(2): 289-293.
Abstract:
Linyi subsag have many faults in Paleogene and Neogene. Meanwhile, their sedimentary facies and depositional systems change frequently.〖KG*2〗Those provided avail qualification for forming the lithologic oil reservoir. The lithologic oil reservoirs in Paleogene〖KG*2〗in Linyi subsag include three kinds, such as oil charged in lensshaped sand body, lithologic upclined pinchout oil reservoir〖KG*2〗and oil charged in sand body that connected on the flanks of the faults. It was suggested that oil charged in lensshaped sand body will easily take place in deep sag belts and delta front〖KG*2〗in gentle slope belts. It was also suggested〖KG*2〗that lithologic upclined pinchout oil reservoirs will easily take place in gentle slope belts. And then, oil charged in sand body that connected on the flanks of the faults easily take place nearby the tectonic belts that faults relatively developed. The exploration practice〖KG*2〗in Linyin subsag revealed that it has abundant oil resources. The primary factor analysis of main controlling〖KG*2〗factors for〖KG*2〗the lithologic oil reservoir forming suggests that the most important controlling factors are the distribution of delta front sand body and fluxoturbidite body and lake sand body, the characteristics of the sealing and translocation of the fault block and unconformability and the characteristics of the valid cap rocks. Under their main control factors, it formed different types of lithologic oil reservoirs in different tectonic positions and different sedimentary facies in order.
Characteristics of Gas Reservoirs with High Content of H2S in the Northeastern Sichuan Basin and the Consumption of Hydrocarbons〖KG*2〗due to TSR
ZHU Guangyou
2006, 24(2): 300-308.
Abstract:
During the recent years, several medium and largescale gas fields, such as the Luojiazhai, Dukouhe, Tianshanpo and Puguang, etc, whose most remarkable features being the higher H2S contents, have been discovered in the northeastern Sichuan basin. Their H2S contents among the gas compositions account for 10 to 17 percent while the average being 14 percent. Based on the thorough study, it can be found that although these largescale oolitic shoal gas reservoirs usually have rich reserves along with high individualwell producing rate, their coefficients of fullness, which ranging from 25 to 91 percent, are generally rather low, also, their pressure coefficients are not high and mostly less than 1.2. According to their reservoir forming conditions, i.e., the abundant oolitic dissolution pores, the efficient reservoirs with huge thickness, the robust gas source, the welldeveloped transport systems, together with the excellent seal ability of the caprocks constituted by shale and gypsolyte, their lower coefficients of fullness were possibly due to a large quantity of hydrocarbons had been consumed or depleted within the traps. In the northeastern Sichuan basin, due to the H2S contained within the Feixianguan formation was generated from the TSR reactions, which occurred within reservoirs, between hydrocarbons and sulfate, there exist negative correlations between the H2S contents and the pressure coefficients, the reservoir water salinity together with the hydrocarbons contents, etc. Therefore, as far as the gas reservoirs with high H2S contents of the Feixianguan formation was concerned, their lower pressure coefficients and coefficients of fullness are likely caused by both the hydrocarbons had been consumed greatly due to TSR and the volume of reservoirs had been expanded.