吐哈盆地台北凹陷天然气地球化学特征及成因分析

赵兴齐，陈践发，赵红静，张晨，郭望，周飞，刘高志

doi:10.11764/j.issn.1672-1926.2013.03.612

天然气地球科学 >

2013 , Vol. 24 >Issue 3: 612 - 620

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.03.612

天然气地球化学

吐哈盆地台北凹陷天然气地球化学特征及成因分析

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1.中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249；
2.长江大学油气资源与勘探技术教育部重点实验室，长江大学地球化学系，湖北荆州 434023；
3.中国石油塔里木油田公司天然气事业部，新疆库尔勒 841000;
4.中国石油青海油田勘探开发研究院,甘肃敦煌 736202

赵兴齐(1984- )，男，贵州福泉人，博士研究生，主要从事油气藏形成机理与分布规律研究.E-mail：zhaoxingqi_77@126.com.

收稿日期: 2012-08-30

修回日期: 2012-12-06

网络出版日期: 2013-06-10

基金资助

国家自然科学基金项目（编号:40472081）;国家科技重大专项(编号:2011ZX05007)联合资助.

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Geochemical Characteristics and Origin of Natural Gasin Taibei Depression,Turpan-Harmi Basin

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1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China; 2.Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education,Yangtze University, Jingzhou 434023,China;3.PetroChina Tarim oilfield company,Department of Natural Gas,Korla 841000,China; 4.Research Institute of Exploration and Development,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,China)

Received date: 2012-08-30

Revised date: 2012-12-06

Online published: 2013-06-10

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摘要

根据天然气组分组成及碳,氢同位素特征，分析了吐哈盆地台北凹陷天然气的地球化学特征、成因及来源。研究区烃类气体以甲烷为主，主要分布在60%～80%之间，重烃气（C 2+）含量较高，集中在20%～40%之间，天然气干燥系数（C1/C1-5）变化较大，集中在60%～80%之间，为典型的湿气；非烃气体总体含量低，主要为N2和CO2，其中雁木西地区较高含量的N2主要来源于大气氮。天然气δ13C1值偏低，集中在-41‰～-39‰之间，δ13C2值大于-29‰，主频率为-28‰～-26‰，δ13C3值、δ13nC4值集中在-26‰～-24‰之间，表明台北凹陷天然气主要为煤成气。天然气δD1值分布在-239.6‰～-111.8‰之间，主频率为-240‰~-230‰，表明研究区气源母质主要形成于陆相淡水沉积环境，且天然气成熟度不高。雁木西油田部分样品天然气湿度较大且碳、氢同位素发生倒转，主要是生物降解作用所致。天然气主要处于未熟—低熟阶段（RO≤0.8%），气源对比表明，台北凹陷天然气主要来源于中侏罗统西山窑组未熟—低熟烃源岩，其次为下侏罗统八道湾组成熟烃源岩。

关键词： 天然气; 碳、氢同位素; 成因类型; 成熟度; 台北凹陷; 吐哈盆地

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赵兴齐，陈践发，赵红静，张晨，郭望，周飞，刘高志 . 吐哈盆地台北凹陷天然气地球化学特征及成因分析[J]. 天然气地球科学, 2013 , 24(3) : 612 -620 . DOI: 10.11764/j.issn.1672-1926.2013.03.612

Abstract

The geochemical characteristics,origin and source of natural gas in Taibei Depression of the Turpan-Harmi Basin are studied based on the information of components,stable carbon and hydrogen isotopes of natural gas.The main component of hydrocarbon gas is methane ranging from 60% to 80%,and the heavy hydrocarbon gas (C2+) which accounts for 20% to 40% possesses relatively high content.The fact that the dryness coefficient varies greatly,in the range of 60% to 80%,shows that the gas is typically wet gas.The main component of non-hydrocarbon gas,N2 and CO2,has lower level of content.And N2 in Yanmuxi with higher content is mainly atmospheric nitrogen.δ13C1 varies from -41‰ to -39‰.δ13C2 is greater than -29‰,mainly in the range of -28‰ to -26‰.δ13C3 and δ13C4 mainly vary from -26‰ to -24‰.All these indicate that it is coal-derived gas.δD1 varies from -239.6‰ to -111.8‰,mainly in the range of -240‰ to -230‰,showing that gas was mainly formed in continental fresh water depositional environment and the maturity of natural gas is not high in the study area.Gas with great wetness and reversed carbon and hydrogen isotope series are caused by biodegradation in Yanmuxi Oilfield.Thermal evolution of natural gas is mainly at immature to low-mature stage (RO≤0.8%).The gas-source correlation shows that natural gas in Taibei Depression is mainly derived from the Middle Jurassic Xishanyao Formation source rocks at immature and low mature stages,while some mature stage source rocks in Badaowan Formation of Lower Jurassic also have some contributions.

Key words： Natural gas; Carbon and hydrogen isotopes; Genetic type; Maturity; Taibei Depression; Turpan-Harmi Basin

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