Controls on Compositional Heterogeneity of Oils in Jiuxi Basin

XIONG Ying; CHENG Ke ming; YANG Zhi ming

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Article Navigation > Acta Sedimentologica Sinica > 2000 > 18(1): 139-145

XIONG Ying, CHENG Ke ming, YANG Zhi ming. Controls on Compositional Heterogeneity of Oils in Jiuxi Basin[J]. Acta Sedimentologica Sinica, 2000, 18(1): 139-145.

Citation:

XIONG Ying, CHENG Ke ming, YANG Zhi ming. Controls on Compositional Heterogeneity of Oils in Jiuxi Basin[J]. Acta Sedimentologica Sinica, 2000, 18(1): 139-145.

Controls on Compositional Heterogeneity of Oils in Jiuxi Basin

1.
Research Institute of Petroleum Exploration and Development CNPC Beijing 100083;
2.
Bureau of Yumen Oil field Yumen Ganmsu 735200

Received Date: 1999-07-28
Rev Recd Date: 1999-09-21
Publish Date: 2000-03-10

Abstract

The physical and chemical nature of petroleum changes with source rock and maturity,although the feature of oil and gas can also be influenced by local biodegadration or water washing.During the process of reservoir filling,some polar compound in crude oils,such as carbazoles which can interact relatively strongly with water,rock minerals and each other,and thus induce hetrogenous petroleum.　Meanwhile, heterogenous migration pathways also influence the characteristics of oils. In the paper,authors discuss in detail the chemical nature of oil samples,which come from six oil fields in Jiuxi Basin.Among twelve oil samples,except one sample's carbon isotope(δ¹³Coil‰)　of the whole liquid hydrocarbon (crude oil) is -30.5‰,the other's is about -31‰,whose absolute error is less than 0.2‰.　Distillation mode of carbon isotope of N-alkane element series is also similar to each other.Based on GC and GC-MS analysis,seventeen conventional geochemical parameters are selected to calculate correlation coefficients between twelve oil samples,correlation coefficients of all samples are more than 0.86,most of them is up to 0.96.All of these parameters show that twelve oil samples come from the same source rock. Two star diagrams (multivariable plots in polar coordinates) have been developed to assess subtle chemical differences among oils.The diagrams are based on analysis of C₇ hydrocarbon of crude oils separated by gas chromatography.The first C₇ diagrams is used for distinguishing variation in oils caused by transformation,e.g. water washing,biodegradation and evaporation. The second C₇-based diagram consists of four ratios composed of compounds that are very resistant to the effects of transformation.Two star diagrams of six oils representing different oil fields show water washing,biodegradation and other transformations are not the main factors to control heterogenous petroleum.Either is maturity,based on the molecular isomerization parameters of C²⁹ααα sterane 20S/(20S+20R) as maturity parameter. At the end of the paper,pyrrolic nitrogen compound distrbutions of crude oil are studied.Pyrrolic nitrogen compounds in oil have been shoun to be very useful geotracers in predicting the direction and even the distance of oil secondary migration in the reservoirs.Alkylcarbazole series in the neutral pyrrolic nitrogen are just discussed,1,8-dimethylcarbazole/3,4-dimethylcarbazole,1,8-dimethylcarbazole/1,3-dimethylcarbzole,carbazole/methylcbazole and methylcarbazole/dimethylcarbzole are used as migration parameters.These parametes of different crude oils with similar other parameters have some changes.It is concluded that migration fractionation is the main factor to control heterogeneity of petroleum in Jiuxi Basin.At the same time,migration parameters verify that oils come from Qingxi sag and the direction of migration is from west to east.
- heterogeneity of petroleum,
- neutral pyrrolic compounds,
- petroleum migration

References

[1]	England W A，et al. The movement and entrapment of petroleum fluids in the subsurface[J].Journal of the Geological Society,London,1987,144,327～347
[2]	Larter S R， Bjorlykke K O， Karlsen D A. et al. Determination of pertroleum accumulation histories：examples from the Ula Field,Central Graben,Norwegian North Sea[A]. In： North Sea Oil & Gas Reserviors-Ⅱ Graham & Trotman,London,1991,319～330
[3]	Horstad L， Larter S R， Dypvik H,et al. Degradation and maturity controls on oil fied petroleum heterogeneity in the Gullfaks Field, Norwegian North Sea[J].Organic Geochemistry 1990,19：107～117
[4]	Leythaeuser D, Ruckheim J. Heterogeneity of oil composition within a reservoir as a reflectance of accumulation histry[J]. Geochimica et Comochimica Acta,1989,53：2 119～2 123
[5]	England W A，Mackenzie A S. Some aspects of the organic geochemistry of petroleum fluids[J]. Geolgische Rundschau, 1989,78,291～303
[6]	陆明海，田时芸编著.石油天然气数学地质[M].武汉：中国地质大学出版社.1991.12～
[7]	Mango F D.An invariance in the ispheptanes of petroleum[J].Science,1987,237：514～517
[8]	Henty I, Halpern Development and applications of light-hydrocarbon-based star diagrams[J].AAPG Bulletin 1995,79：801～815
[9]	Haven H L.Apllication and limiatations of Mango's light hydrocarbon parameters in petroleum correlation studies[J].Organic Geochemisty,1996，(24,10/11)：957～976
[10]	王培荣.原油中轻烃成因的探讨—塔里木盆地原油轻烃的组成特征[A].见：江汉石油学院分析测试研究中心编.有机地球化学研究进展.重庆：重庆出版社 1996
[11]	朱丹，林壬子.轻烃资料在油气勘探及油藏地球化学中的应用.见：林壬子主编.油气勘探与油藏地球化学.北京：石油工业出版社, 1998
[12]	Li M,Larter S R.Interactions of organic nitrogen species with mineral water and organic networks：Implications to petroleum geochemistry[R].205th American Chemical Society Meeting. Division of Geochemistry,American Chemical Society,Abstract Paper 1993.89
[13]	Li M,Larter S R,Stoddart D,Bjoroy M.Fractionation of pyrolic nitrogen compounds in petroluem during migration：derivation of migration related geochemical parameters[A].In the Geochemistry of Reserviors.Geological Society of London,Special pubication No.86.1995
[14]	Stoddart D P,Hall P B,Larter S R.et al The reservoir geochemistry of the Eldfisk Field, Norwegian North Sea[A].In the Geochemistry of Reserviors.Geological Society of London,Special publication No.86,1995
[15]	Larter S R,Aplin A C.Reservoir geochemistry methods,apllication and opportunities[A].In the Geochemistry of Reserviors.Geological Society of London,Special publication No.86,1995.

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Controls on Compositional Heterogeneity of Oils in Jiuxi Basin

1. Research Institute of Petroleum Exploration and Development CNPC Beijing 100083;

2. Bureau of Yumen Oil field Yumen Ganmsu 735200

Received Date: 1999-07-28

Rev Recd Date: 1999-09-21

Publish Date: 2000-03-10

Key words:

Abstract: The physical and chemical nature of petroleum changes with source rock and maturity,although the feature of oil and gas can also be influenced by local biodegadration or water washing.During the process of reservoir filling,some polar compound in crude oils,such as carbazoles which can interact relatively strongly with water,rock minerals and each other,and thus induce hetrogenous petroleum.　Meanwhile, heterogenous migration pathways also influence the characteristics of oils. In the paper,authors discuss in detail the chemical nature of oil samples,which come from six oil fields in Jiuxi Basin.Among twelve oil samples,except one sample's carbon isotope(δ¹³Coil‰)　of the whole liquid hydrocarbon (crude oil) is -30.5‰,the other's is about -31‰,whose absolute error is less than 0.2‰.　Distillation mode of carbon isotope of N-alkane element series is also similar to each other.Based on GC and GC-MS analysis,seventeen conventional geochemical parameters are selected to calculate correlation coefficients between twelve oil samples,correlation coefficients of all samples are more than 0.86,most of them is up to 0.96.All of these parameters show that twelve oil samples come from the same source rock. Two star diagrams (multivariable plots in polar coordinates) have been developed to assess subtle chemical differences among oils.The diagrams are based on analysis of C₇ hydrocarbon of crude oils separated by gas chromatography.The first C₇ diagrams is used for distinguishing variation in oils caused by transformation,e.g. water washing,biodegradation and evaporation. The second C₇-based diagram consists of four ratios composed of compounds that are very resistant to the effects of transformation.Two star diagrams of six oils representing different oil fields show water washing,biodegradation and other transformations are not the main factors to control heterogenous petroleum.Either is maturity,based on the molecular isomerization parameters of C²⁹ααα sterane 20S/(20S+20R) as maturity parameter. At the end of the paper,pyrrolic nitrogen compound distrbutions of crude oil are studied.Pyrrolic nitrogen compounds in oil have been shoun to be very useful geotracers in predicting the direction and even the distance of oil secondary migration in the reservoirs.Alkylcarbazole series in the neutral pyrrolic nitrogen are just discussed,1,8-dimethylcarbazole/3,4-dimethylcarbazole,1,8-dimethylcarbazole/1,3-dimethylcarbzole,carbazole/methylcbazole and methylcarbazole/dimethylcarbzole are used as migration parameters.These parametes of different crude oils with similar other parameters have some changes.It is concluded that migration fractionation is the main factor to control heterogeneity of petroleum in Jiuxi Basin.At the same time,migration parameters verify that oils come from Qingxi sag and the direction of migration is from west to east.

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Reference (15)

[1]	England W A，et al. The movement and entrapment of petroleum fluids in the subsurface[J].Journal of the Geological Society,London,1987,144,327～347
[2]	Larter S R， Bjorlykke K O， Karlsen D A. et al. Determination of pertroleum accumulation histories：examples from the Ula Field,Central Graben,Norwegian North Sea[A]. In： North Sea Oil & Gas Reserviors-Ⅱ Graham & Trotman,London,1991,319～330
[3]	Horstad L， Larter S R， Dypvik H,et al. Degradation and maturity controls on oil fied petroleum heterogeneity in the Gullfaks Field, Norwegian North Sea[J].Organic Geochemistry 1990,19：107～117
[4]	Leythaeuser D, Ruckheim J. Heterogeneity of oil composition within a reservoir as a reflectance of accumulation histry[J]. Geochimica et Comochimica Acta,1989,53：2 119～2 123
[5]	England W A，Mackenzie A S. Some aspects of the organic geochemistry of petroleum fluids[J]. Geolgische Rundschau, 1989,78,291～303
[6]	陆明海，田时芸编著.石油天然气数学地质[M].武汉：中国地质大学出版社.1991.12～
[7]	Mango F D.An invariance in the ispheptanes of petroleum[J].Science,1987,237：514～517
[8]	Henty I, Halpern Development and applications of light-hydrocarbon-based star diagrams[J].AAPG Bulletin 1995,79：801～815
[9]	Haven H L.Apllication and limiatations of Mango's light hydrocarbon parameters in petroleum correlation studies[J].Organic Geochemisty,1996，(24,10/11)：957～976
[10]	王培荣.原油中轻烃成因的探讨—塔里木盆地原油轻烃的组成特征[A].见：江汉石油学院分析测试研究中心编.有机地球化学研究进展.重庆：重庆出版社 1996
[11]	朱丹，林壬子.轻烃资料在油气勘探及油藏地球化学中的应用.见：林壬子主编.油气勘探与油藏地球化学.北京：石油工业出版社, 1998
[12]	Li M,Larter S R.Interactions of organic nitrogen species with mineral water and organic networks：Implications to petroleum geochemistry[R].205th American Chemical Society Meeting. Division of Geochemistry,American Chemical Society,Abstract Paper 1993.89
[13]	Li M,Larter S R,Stoddart D,Bjoroy M.Fractionation of pyrolic nitrogen compounds in petroluem during migration：derivation of migration related geochemical parameters[A].In the Geochemistry of Reserviors.Geological Society of London,Special pubication No.86.1995
[14]	Stoddart D P,Hall P B,Larter S R.et al The reservoir geochemistry of the Eldfisk Field, Norwegian North Sea[A].In the Geochemistry of Reserviors.Geological Society of London,Special publication No.86,1995
[15]	Larter S R,Aplin A C.Reservoir geochemistry methods,apllication and opportunities[A].In the Geochemistry of Reserviors.Geological Society of London,Special publication No.86,1995.

Controls on Compositional Heterogeneity of Oils in Jiuxi Basin

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通讯作者: 陈斌, bchen63@163.com

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