天然气地球科学

• 天然气地质学 • 上一篇    下一篇

四川盆地上三叠统气藏成藏年代及差异

王鹏,刘四兵,沈忠民,黄飞,罗自力,陈飞   

  1. 1.宜宾学院矿业与安全工程学院,四川 宜宾 644000;
    2.成都理工大学油气藏地质及开发工程国家重点实验室,四川 成都 610059;
    3.中国石油西南油气田公司川中油气矿,四川 南充637000
  • 收稿日期:2014-11-12 修回日期:2015-01-06 出版日期:2016-01-10 发布日期:2016-01-10
  • 作者简介:王鹏(1986-),男,四川西充人,讲师,博士,主要从事油气地质与地球化学研究. E-mail:wp2009@126.com.
  • 基金资助:

    国家自然科学基金(编号:41172119);国家科技部油气藏地质及开发工程国家重点实验室资助项目(编号:国重科研C08)联合资助.

Hydrocarbon accumulation history and its difference of gas reservoirs in Upper Triassic Formation of Sichuan Basin

Wang Peng,Liu Si-bing,Shen Zhong-min,Huang Fei,Luo Zi-li,Chen Fei   

  1. 1.College of Mining and Safety Engineering,Yibin University,Yibin 644000,China;
    2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu 610059,China;
    3.Central Sichuan Gasfield of PetroChina Southwest Oil and Gas Field  Company,Nanchong 637000,China
  • Received:2014-11-12 Revised:2015-01-06 Online:2016-01-10 Published:2016-01-10

摘要:

利用烃源岩生烃史、圈闭形成时期、包裹体均一温度、自生伊利石测年、ESR测年等分析,对四川盆地上三叠统气藏成藏年代进行综合分析及差异对比。结果表明四川盆地上三叠统气藏成藏过程:主要发生在侏罗纪与白垩纪;可分为3期,喜马拉雅期前烃源岩早期生烃成藏、大量生烃成藏和喜马拉雅期部分油气调整再成藏,以喜马拉雅期前大量生烃成藏阶段最重要。四川盆地上三叠统气藏成藏年代区域差异显著:川西地区在晚三叠世的须五段沉积期开始成藏,中侏罗世早期至晚白垩世末期为主要成藏阶段;川中地区在晚侏罗世早期开始成藏,早白垩世中期至晚白垩世末期为主要成藏阶段;川南地区在晚侏罗世中期开始成藏,晚白垩世中期至晚白垩世末期为主要成藏阶段。即四川盆地上三叠统气藏成藏,川西地区最早,川中地区略早于川南地区。四川盆地上三叠统气藏成藏年代研究,有助于认识四川盆地上三叠气藏的成藏过程、成藏机理及气藏分布。同时研究发现四川盆地上三叠统自生伊利石多属深埋藏成因,故其测年结果主要记录了晚期成藏过程。这说明利用伊利石测年需要充分考虑其成因,否则测年结果可能难以准确反映成藏年代信息。

关键词: 四川盆地, 上三叠统, 成藏年代, 生烃史, 包裹体均一温度, 伊利石测年, ESR测年

Abstract:

Analysis of hydrocarbon generation,trap formation,inclusion homogenization temperature,authigenic illite dating and ESR dating were used to understand the hydrocarbon accumulation history and its difference of gas reservoirs in Upper Triassic Formation of Sichuan Basin.The results show the hydrocarbon accumulation mainly occurred during Jurassic and Cretaceous and could be classified into three stages:early hydrocarbon generation accumulation stage and mass hydrocarbon generation accumulation stage before Himalayan Epoch,and parts of hydrocarbon adjustment and re-accumulation during Himalayan Epoch.The second stage is more important than the other two.The Hydrocarbon accumulation histories are obviously distinct in different regions.In west Sichuan Basin,the gas accumulation began at the deposition period of member 5 of Xujiahe Formation and mass accumulation occurred during the Early Middle Jurassic to the end of Upper Cretaceous.In middle Sichuan Basin,the accumulation began at the early Upper Jurassic and the mass accumulation occurred from Middle Lower Cretaceous to the end of Upper Cretaceous.In south Sichuan Basin,the accumulation began at the Middle Upper Jurassic and the mass accumulation occurred from Middle Upper Cretaceous to the end of Upper Cretaceous.The accumulation history of west Sichuan Basin is the earliest,and the south Sichuan Basin is the latest.This paper will help to understand the accumulation process,accumulation mechanism and gas reservoir distribution of Triassic gas reservoirs in Sichuan Basin.Meanwhile,it is found that the authigenic illite origin of deep-burial and its dating is a record of the later accumulation.This suggests that the illite dating needs to fully consider illite origin,otherwise the dating results may be difficult to accurately reflect hydrocarbon accumulation history.

Key words: Sichuan Basin;Upper Triassic, Hydrocarbon accumulation history, Hydrocarbon generation history, Inclusion homogenization temperature, Authigenic illite dating, ESR dat

中图分类号: 

  • TE122.3

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