收稿日期: 2017-07-01
修回日期: 2017-09-28
网络出版日期: 2017-12-10
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
Received date: 2017-07-01
Revised date: 2017-09-28
Online published: 2017-12-10
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。
焦伟伟,汪生秀,程礼军,罗情勇,方光建 . 渝东南地区下寒武统页岩气高氮低烃成因[J]. 天然气地球科学, 2017 , 28(12) : 1882 -1890 . DOI: 10.11764/j.issn.1672-1926.2017.11.017
Key words: Southeast Chongqing; The Lower Cambrian; Shale gas; Nitrogen source; Decollement; Unconformity
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