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天然气地球科学

• 非常规天然气 • 上一篇    下一篇

四川盆地龙马溪组页岩气地球化学特征及其地质意义

高波   

  1. 1.中国石化石油勘探开发研究院，北京 100083；2.中国石化页岩油气勘探开发重点实验室，北京 100083
  • 收稿日期:2015-02-26 修回日期:2015-05-25 出版日期:2015-06-10 发布日期:2015-06-10
  • 作者简介:高波(1969-)，男，甘肃张掖人，高级工程师，博士，主要从事非常规油气地质、油气地球化学研究.E-mail:gaobo.syky@sinopec.com.
  • 基金资助:

    中国石化科技开发部项目“页岩气源—储相互关系及含气性研究”(编号:G5800-13-ZS-KJB005)资助.

Geochemical Characteristics of Shale Gas from Lower Silurian Longmaxi Formation in the Sichuan Basin and Its Geological Significance

GAO Bo   

  1. 1.Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China;
    2.Sinopec Key Laboratory of Shale Gas/Oil Exploration & Production,Beijing 100083,China
  • Received:2015-02-26 Revised:2015-05-25 Online:2015-06-10 Published:2015-06-10

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摘要：

四川盆地下志留统龙马溪组是目前我国页岩气勘探开发的重点领域。在对四川盆地源自龙马溪组的石炭系黄龙组天然气和龙马溪组页岩气的组分及同位素进行对比分析的基础上，对龙马溪组页岩气中烷烃气碳、氢同位素组成倒转的原因进行了探讨。龙马溪组页岩气中CH4含量占95.52%～99.59%，平均为98.54%;C2H6含量占0.23%～0.72%，平均为0.48%;C3H8含量占0%～0.03%;干燥系数C1/C1-5>0.99，表明龙马溪组页岩气为典型的干气;δ13C1值介于-37.3‰～-26.7‰之间，δ13C2值介于-42.8‰～-31.6‰之间，δ13C3值介于-43.5‰～-33.1‰之间，呈现出油型气特征，但烷烃气碳同位素均发生了倒转，表现为δ13C1>δ13C2；大部分页岩气烷烃气氢同位素也发生了倒转，表现为δD1＞δD2。通过与国外页岩气地球化学对比分析，四川盆地龙马溪组页岩气与美国Fayetteville等高成熟度页岩气相似，主要为过成熟阶段的干酪根裂解气与页岩中早期形成的可溶有机质裂解成气的混合产物，具有页岩气富集高产的物质基础。

关键词: 四川盆地, 龙马溪组, 页岩气, 组分, 稳定同位素

Abstract:

The shale of Lower Silurian Longmaxi Formation has become a key target for shale gas exploration and development in China recently.Based on the analysis of chemical component and stable isotope composition of natural gas in Carboniferous Huanglong Formation derived from Longmaxi Formation and Longmaxi shale gas itself,the reason of carbon and hydrogen isotopic reversal in shale gas is discussed in this paper.The shale gas is mainly composed of hydrocarbon gas in which CH4content is in range of 95.52%-99.59%,C2H6 of 0.23%-0.72%,and C3H8of 0%-0.03%.The drying coefficient (C1/C1-5) is more than 0.99,indicating typical dry gas.δ13C1 values range from -37.3‰ to -26.7‰,δ13C2 from -42.8‰ to -31.6‰,and δ13C3 from -43.5‰ to -33.1‰,respectively.The carbon isotope values indicate that the hydrocarbon gas is oil-derived gas.However,the reversal of carbon and hydrogen isotopes of hydrocarbon gases in shale gas occurs,i.e.δ13C1>δ13C2,δD1＞δD2.The geochemical characteristic of high thermal maturity and reversal carbon isotopes in the Longmaxi shale gas is similar with the Fayetteville shale gas in US.The Longmaxi shale gas is mixing of gases from decomposition of kerogen at high thermal maturity and cracking of soluble organic matter retained in the shale,suggesting there would be abundant shale gas resource for high productivity.

Key words: Sichuan Basin, Longmaxi Formation, Shale gas, Component, Stable isotope composition

中图分类号: 

  • TE122.1

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