首页> 中文期刊> 《中国矿业》 >中国南方海相页岩气与华北煤系页岩气储层特征差异分析

中国南方海相页岩气与华北煤系页岩气储层特征差异分析

         

摘要

Marine shale gas has been developed widely in southern China,which proves better prospects.While researches about coal-bearing shale gas remain fewer.This paper mainly takes marine shale gas in Fenggang district of Guizhou province and coal-bearing shale gas in Qinshui basin as an example,contrasting reservoir features between four factors,including the kerogen type,total content of organic carbon,mineral composition and pore structure,then points out the reservoir differences to analysis the shale under the control of depositional environment.The studies show that there exists both differences and similarities between them.Marine shale gas reservoir possesses typeⅠand typeⅡkerogen,however, coal-bearing shale gas reservoir mostly owns type Ⅲ kerogen.In addition,marine shale gas reservoir has higher TOC content,brittle mineral content and larger pore surface.On the other hand,these two kinds of shale develop organic pores.Meanwhile,nitrogen isothermal adsorption curves are consistent with typeⅣ,and mesopores play a dominant role in pores.However,due to the thin layer thickness and poor continuity of coal-bearding shale,the exploration of coal bearing shale gas can not copy the pattern of marine shale gas.It is considerable that coal bearing shale gas can be co-exploit with the tight sandstone gas and coalbed methane to improve resource utilization and achieve economic exploitation.%我国海相页岩气的勘探开发已经取得了一定的进展,相比之下,煤系页岩气研究成果较少.本文以贵州凤冈区的海相页岩和沁水盆地的煤系页岩为例,通过干酪根类型、总有机碳含量、矿物组成和孔隙结构等四方面进行储层特性对比,分析海相页岩气储层和煤系页岩气储层差异,查明不同沉积环境下页岩气储层特点,为煤系页岩气的进一步勘探开发奠定基础.研究结果表明两者既有相似又有所区别:海相页岩和煤系页岩干酪根类型存在明显差异,前者以Ⅰ型、Ⅱ型干酪根为主,后者主要为Ⅲ型干酪根;海相页岩总有机碳含量和脆性矿物含量较煤系页岩高;两者均发育有机质孔,且以中孔(2~50nm)为主,低温氮气吸附曲线都为Ⅳ型,但海相页岩孔隙比表面积较高.加之煤系页岩单层厚度薄,连续性差,对煤系页岩气的勘探开发不能完全照搬海相页岩气的开发模式,可以考虑与煤层气、致密砂岩气一起勘探开发,提高资源利用率,实现经济开采.

著录项

  • 来源
    《中国矿业》 |2017年第3期|166-170|共5页
  • 作者

    孙彩蓉; 唐书恒; 魏建光;

  • 作者单位

    中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京 100083;

    中国地质大学(北京)页岩气资源勘查与战略评价国土资源部重点实验室,北京 100083;

    中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京 100083;

    中国地质大学(北京)页岩气资源勘查与战略评价国土资源部重点实验室,北京 100083;

    中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京 100083;

    中国地质大学(北京)页岩气资源勘查与战略评价国土资源部重点实验室,北京 100083;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 TE122.2;
  • 关键词

    凤冈区; 沁水盆地; 沉积环境; 页岩储层; 联合开采; 煤系页岩气;

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