济阳坳陷孤岛油田微生物降解原油伴生气成因特征

doi:10.11743/ogg20070319

石油与天然气地质 ›› 2007, Vol. 28 ›› Issue (3): 427-432.doi: 10.11743/ogg20070319

济阳坳陷孤岛油田微生物降解原油伴生气成因特征

王万春¹, 李钜源², 唐洪三², 崔军汉³, 康晏²

1. 中国科学院, 兰州地质研究所, 甘肃兰州, 730000;
2. 中国石化, 胜利油田有限公司, 地质科学研究院, 山东, 东营, 257015;
3. 中国石化, 胜利油田有限公司, 孤岛采油厂地质所, 山东, 东营, 257231

收稿日期:2006-08-22 出版日期:2007-06-25 发布日期:2012-01-16
基金项目:
国家重点基础研究发展规划(973)项目(2001CB209102).

Genetic characteristics of associated gases from crude oil biodegradation in Gudao oilfield,Jiyang depression

Wang Wanchun¹, Li Juyuan², Tang Hongsan², Cui Junhan³, Kang Yan²

1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou, Gansu 730000;
2. Research Institute of Geological Sciences, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257015;
3. Geological Institute of Gudao Oil Recovery Plant, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257231

Received:2006-08-22 Online:2007-06-25 Published:2012-01-16

摘要/Abstract

摘要：

微生物降解原油伴生天然气中,既有遭受微生物降解后残余的组分,也可能有厌氧微生物降解原油后的产物。济阳坳陷孤岛油田降解原油伴生气组分及同位素组成特征表明,孤岛油田天然气由腐泥型母质生成,主要来自沙河街组三段烃源岩。由于微生物降解原油过程中产生的碳同位素组成偏轻、氢同位素组成偏重的次生生物成因甲烷的混入,使降解原油伴生气组分组成变干,甲烷碳、氢同位素组成呈反常的负相关分布。微生物对天然气中丙烷及正丁烷组分的降解,导致一些样品具有明显偏重的丙烷和正丁烷δ¹³C值。

关键词: 伴生气, 微生物降解原油, 碳同位素, 济阳坳陷

Abstract:

Associated gases from crude biodegradation possibly contain remnants from microbial degradation as well as products from the anaerobic biodegradation of crude.Studying this kind of associated gas and restoring its original properties are helpful to gas source correlation and exploration of natural gas.The components and isotopic compositions of associated gases from crude biodegradation in Gudao oilfield of Jiyang depression indicate that the natural gas in this field is generated by the sapropelic organic materials mainly in the third member of the Shahejie Formation.The interfusion of secondary biogenic methane with relatively lighter carbon and heavier hydrogen isotopic compositions that are generated from the biodegradation of oils results in the drier components and abnormal negative correlation between the carbon and hydrogen isotopic compositions of methane for the associated gases of crude biodegradation.The attack of micro organisms on propane and n-butane of the na-tural gas causes evident heavier δ¹³C values of propane and n-butane in some samples.

Key words: associated gas, biodegraded crude oil, carbon isotope, Jiyang depression

中图分类号:

TE112.1

王万春,李钜源,唐洪三,等. 济阳坳陷孤岛油田微生物降解原油伴生气成因特征[J]. 石油与天然气地质, 2007, 28(3): 427-432. doi: 10.11743/ogg20070319 Wang Wanchun,Li Juyuan,Tang Hongsan,et al. Genetic characteristics of associated gases from crude oil biodegradation in Gudao oilfield,Jiyang depression[J]. Oil & Gas Geology, 2007, 28(3): 427-432. doi: 10.11743/ogg20070319

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济阳坳陷孤岛油田微生物降解原油伴生气成因特征

Genetic characteristics of associated gases from crude oil biodegradation in Gudao oilfield,Jiyang depression

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