天然气地球化学

细菌作用对天然气地球化学组成的影响——以准噶尔盆地腹部石南油气田为例

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  • 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油新疆油田公司,新疆 克拉玛依 834000
卫延召(1972-),男,河南洛阳人,高级工程师,博士,主要从事石油、天然气地质综合研究. E-mail:weiyanzhao@petrochina.com.cn.

收稿日期: 2016-05-09

  修回日期: 2016-08-29

  网络出版日期: 2019-09-06

基金资助

中国石油科技专项“远源、次生岩性地层油气藏输导体系刻画与成藏规律研究”(编号:2016B-0301);国家自然科学基金青年项目“生物降解作用对原油中金刚烷类化合物组成的影响”(编号:41503044)联合资助.

Bacteria effects on geochemical characteristics of natural gas:A case study in the Shinan Oil-Gasfield,central Junggar Basin

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2016-05-09

  Revised date: 2016-08-29

  Online published: 2019-09-06

摘要

通过对准噶尔盆地腹部石南油气田23个天然气样品组分和稳定碳同位素分析将其分为5种类型:第1类来自中二叠统乌尔禾组偏腐殖型烃源岩的原生热成因气,是石南油气田天然气的主体;第2类包括基001井、基003井、石南4井和石南5井4个样品,混入了少量的生物成因甲烷;第3类丙烷和丁烷碳同位素倒转幅度高达9.6‰,可能发生了细菌对丙烷的选择性降解;第4类天然气乙烷和丙烷碳同位素发生了倒转,可能源自细菌对乙烷的选择性降解;第5类来自下二叠统风城组的油型气,天然气甲烷遭受了细菌的选择性降解。绝大部分受细菌作用影响的样品现今埋深较大,反映可能存在2个阶段的细菌作用过程。

本文引用格式

卫延召, 龚德瑜, 王峰, 吴爱成, 孙靖, 房忱琛, 刘刚, 陈棡 . 细菌作用对天然气地球化学组成的影响——以准噶尔盆地腹部石南油气田为例[J]. 天然气地球科学, 2016 , 27(12) : 2176 -2184 . DOI: 10.11764/j.issn.1672-1926.2016.12.2176

Abstract

Five different types of natural gas were identified in the Shinan Oil-Gasfield,central Junggar Basin.The first type is original thermal gas derived from humic source rocks in the Middle Permian Wuerhe Formation and accounts for the main body of Shinan natural gas.The second type is mixed with a small amount of biotic gas including Ji001,Ji003,Shinan4 and Shinan5 which was resulted from the biodegradation of primary oil accumulation.Selective biodegradation on propane occurred in the third type whose carbon isotope of propane is 9.6‰ more positive than that of butane.Selective biodegradation on ethane occurred in the fourth type whose carbon isotope of ethane is more positive than that of propane.The fifth type is derived from sapropelic source rocks in the Lower Permian Fengcheng Formation with its methane being selectively biodegraded.Considering the present burial depth of biodegraded samples,two stages of bacteria process may occur in the study area.

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