天然气地球科学

• 非常规天然气 • 上一篇    下一篇

渝东南地区下寒武统页岩气高氮低烃成因

焦伟伟,汪生秀,程礼军,罗情勇,方光建   

  1. 1.重庆地质矿产研究院国土资源部页岩气资源勘查重点实验室,重庆 400042;
    2.重庆地质矿产研究院重庆市页岩气资源与勘查工程技术研究中心,重庆 400042;
    3.油气资源与探测国家重点实验室重庆页岩气研究中心,重庆 400042;
    4.中国石油大学(北京),北京 102249
  • 收稿日期:2017-07-01 修回日期:2017-09-28 出版日期:2017-12-10 发布日期:2017-12-10
  • 作者简介:焦伟伟(1981-),女,河北承德人,高级工程师,博士,主要从事非常规油气富集规律与评价选区研究.E-mail:jiaoweiw-210@163.com.
  • 基金资助:

    国家科技重大专项“下古生界页岩有机质成熟度、类型及结构分析方法研究”(编号:2016ZX05034003-001);重庆市重点产业共性关键技术创新专项(编号:cstc2016zdcy-zd90001);国家重点基础研究发展计划(973计划)项目“渝东南地区页岩气资源潜力评价”(编号:2012CB214705-05)联合资助.

The reason of high nitrogen content and low hydrocarbon content of shalegas from the Lower Cambrian Niutitang Formation in southeast Chongqing

Jiao Wei-wei,Wang Sheng-xiu,Cheng Li-jun,Luo Qing-yong,Fang Guang-jian   

  1. 1.Key Laboratory of Shale Gas Exploration,Ministry of Land and Resources,Chongqing Institute of Geology and
    Mineral Resources,Chongqing 400042,China;2.Chongqing Engineering Research Center for Shale Gas
    Resource & Exploration,Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,China;
    3.Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting,Chongqing 400042,China;
    4.China University of Petroleum,Beijing 102249,China
  • Received:2017-07-01 Revised:2017-09-28 Online:2017-12-10 Published:2017-12-10

摘要:

聚焦渝东南下寒武统牛蹄塘组页岩高有机碳、微含烃、高含氮的复杂特性,从气体组分、成因类型等有机地球化学角度出发,利用同位素和流体包裹体分析结合区域构造演化特征,追踪氮气来源,挖掘牛蹄塘组高含氮的原因,最终结合勘探实践建立渝东南地区下寒武统页岩气破坏散失模型,为评价选区和勘探部署提供参考。牛蹄塘组页岩气属高温裂解气,氮气含量普遍高于90%,烃类不足3%,其中氮气是有机质热演化氮气和大气氮气的混合成因气;上震旦统灯影组顶部的不整合面与周围深大断裂沟通,构成了水体侵入和气体散失的通道,底板封盖能力差、深大断裂发育和流体活动频繁是渝东南地区页岩气保存条件的最主要的3个破坏因素,是导致牛蹄塘组页岩气“高氮、低烃”的关键。

关键词: 渝东南, 下寒武统, 页岩气, 氮气来源, 滑脱层, 不整合面

Abstract:

Focus on the complexity of the Lower Cambrian Niutitang Formation that high total organic content,low hydrocarbon content and high nitrogen content,based on gas compound and genetic type,isotope,fluid inclusion and tectonic evolution analysis were done to trace nitrogen origin,which could help to understand why Niutitang Formation has high nitrogen content.Finally combined with exploration practice,the destruction model of shale gas was built,which could be the reference of evaluation and deployment.Nitrogen content of shale gas from the Lower Cambrian Niutitang Formation was above 90% and hydrocarbon is below 3%.The nitrogen gas was from air and organic evolution.The regional decollement zone at the bottom of the Lower Cambrian Niutitang Formation and the unconformity above the Dengying Formation were connected with the deep-large fault,which was the main pathway of gas dissipation and water intrusion.The three main destruction factors were poor bottom preservation condition,deep-large fault development and frequent fluid activities,which were the main reasons of high nitrogen content and low hydrocarbon content of shale gas from the Lower Cambrian Niutitang Formation in southeast Chongqing.
 

Key words: Southeast Chongqing, The Lower Cambrian, Shale gas, Nitrogen source, Decollement, Unconformity

中图分类号: 

  • TE122.2

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