四川盆地东北地区下寒武统海相页岩气成因: 来自气体组分和碳同位素组成的启示

doi:10.7623/syxb201303005

石油学报 ›› 2013, Vol. 34 ›› Issue (3): 453-459.DOI: 10.7623/syxb201303005

四川盆地东北地区下寒武统海相页岩气成因: 来自气体组分和碳同位素组成的启示

韩辉¹, 李大华², 马勇¹, 程礼军², 齐琳², 王琪¹, 钟宁宁¹

1. 中国石油大学油气资源与探测国家重点实验室北京 102249;
2. 重庆地质矿产研究院重庆 400042

收稿日期:2012-10-30 修回日期:2013-01-15 出版日期:2013-05-25 发布日期:2013-04-09
通讯作者: 钟宁宁,男,1960年7月生,1981年毕业于焦作工学院,1984年毕业于中国矿业大学研究生部,现为中国石油大学(北京)地球科学学院教授、博士生导师,主要从事石油与天然气地球化学研究与教学工作。Email:nnzhongxp@cup.edu.cn
作者简介:韩辉,男,1986年3月生,2008年获长江大学学士学位,2011年获中国石油大学(北京)硕士学位,现为中国石油大学(北京)博士研究生,主要从事油气地质与地球化学方面研究。 Email:hanhuigeology@163.com
基金资助:
国家重大科技专项(2011ZX05018-002)资助。

The origin of marine shale gas in the northeastern Sichuan Basin,China:implications from chemical composition and stable carbon isotope of desorbed gas

HAN Hui¹, LI Dahua², MA Yong¹, CHENG Lijun², QI Lin², WANG Qi¹, ZHONG Ningning¹

1. State Key Laboratory of Petroleum Resource & Prospecting, China University of Petroleum, Beijing 102249, China;
2. Chongqing Institute of Geology & Mineral Resources, Chongqing 400042, China

Received:2012-10-30 Revised:2013-01-15 Online:2013-05-25 Published:2013-04-09

摘要/Abstract

摘要：

通过对四川盆地东北地区下寒武统海相页岩的现场解吸,获取气样并进行了组分和稳定碳同位素分析。结果表明,页岩气的甲烷含量介于96.39 % ~98.83 % ,其他组分含量较少;各组分相对含量随着解吸时间和累积解吸气量呈现规律性变化,该变化规律可能为泥页岩对不同气体吸附能力的差异所致。页岩气甲烷稳定碳同位素组成(δ¹³C₁)在-32.20 ‰ ~-29.50 ‰ 之间,乙烷稳定碳同位素组成(δ¹³C₂)介于-37.70 ‰ ~-36.60 ‰ ,所有气样均有δ¹³C₁>δ¹³C₂的"逆序"特点,这可能是在高成熟阶段,液态烃裂解气与早期生成的干酪根裂解气混合作用所致。随解吸时间增加,δ¹³C₁约有2.3 ‰ 的分馏,这可能与气体在解吸过程中的扩散作用有关。

关键词: 页岩气, 成因, 气体组成, 碳同位素组成, 下寒武统, 四川盆地

Abstract:

Desorption experiments were performed on Lower Cambrian shale cores from the northeastern Sichuan Basin, China and desorbed gas was obtained for analyses of its chemical composition and stable carbon isotope. The results showed that methane (CH₄) content of the desorbed gas ranges from 96.39 % to 98.83 % , while amounts of other gaseous hydrocarbons are pretty small. With increase of desorption time and cumulative amounts of the desorbed gas, conte nts of individual gas compounds vary regularly, which may result from a different adsorption capacity of shales to individual gas compounds. Stable carbon isotopic values of methane (δ¹³C₁) and ethane (δ¹³C₂) in the desorbed shale gas range from -32.20 ‰ to -29.50 ‰ and -37.70 ‰ to -36.60 ‰ , respectively. All of the desorbed gas samples are characterized by a "reversed" order of carbon isotope, which may result from mixture of two gases generated from cracking of liquid hydrocarbons at high maturity and kerogen pyrolysis at the early hydrocarbon-generating stage. With increase of desorption time, about 2.3 ‰ of carbon isotopic fractionation occurs in δ¹³C₁. This fractionation of δ¹³C₁ may be attributed to a diffusion effect of gas during desorption process.

Key words: shale gas, origin, gas composition, carbon isotope, Lower Cambrian, Sichuan Basin

中图分类号:

TE122.2

韩辉, 李大华, 马勇, 程礼军, 齐琳, 王琪, 钟宁宁. 四川盆地东北地区下寒武统海相页岩气成因: 来自气体组分和碳同位素组成的启示[J]. 石油学报, 2013, 34(3): 453-459.

HAN Hui, LI Dahua, MA Yong, CHENG Lijun, QI Lin, WANG Qi, ZHONG Ningning. The origin of marine shale gas in the northeastern Sichuan Basin,China:implications from chemical composition and stable carbon isotope of desorbed gas[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(3): 453-459.

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四川盆地东北地区下寒武统海相页岩气成因: 来自气体组分和碳同位素组成的启示

The origin of marine shale gas in the northeastern Sichuan Basin,China:implications from chemical composition and stable carbon isotope of desorbed gas

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