摘要
利用岩石热解、X射线衍射、镜质体反射率、红外碳硫测定和有机质成熟度分析等方法,以桂中拗陷最北部的石门剖面为例,探讨下石炭统页岩气勘探潜力。下石炭统英塘组第三段厚约340 m,有机质含量较高(TOC质量分数为1.04%～1.47%);R_o值为2.35%～2.77%,平均为2.52%;脆性矿物的质量分数为50%～77%,脆性指数为29.59%～47.96%;黏土矿物经历了较为明显的蒙皂石向伊利石的转化阶段,微孔隙发育程度较高。将该剖面页岩气储层的地化、物性特征及沉积厚度与四川盆地及北美页岩气对比,认为桂中拗陷英塘组第三段具有较好的页岩气勘探潜力。
The Shimen section in the north Guizhong depression is studied by means of rock pyrolysis, X-ray diffraction, vitrinite reflectance, infrared carbon and sulphur determination and organic matter maturity analysis so as to discuss the exploration potential of Lower Carboniferous shale gas. It shows that the mudstone and shale in the Member 3 of Yingtang Formation has a thickness of 340 m, with high abundance of organic matter(TOC of 1.04%~1.47%), moderate thermal maturity(2.35%~2.77%), well developed micro-pores, suitable brittle mineral content(50%~77%) and favorable clay mineral compositions. Clay minerals experienced obvious transformation from smectite to illite with well developed micro pores. Comparison of thickness, physical property and geochemistry in the Shimen section with those in the Sichuan Basin and northern America reveals that the Member 3 of Yingtang Formation in the central Guangxi is of favorable exploration potential for shale gas.
作者
张子亚
吴超伟
石砥石
覃英伦
刘欣春
罗文
徐胜林
赵应权
张聪
ZHANG Ziya;WU Chaowei;SHI Dishi;QIN Yinglun;LIU Xinchun;LUO Wen;XU Shenglin;ZHAO Yingquan;ZHANG Cong(Oil&Gas Survey Center of China Geological Survey,Beijing 100083,China;Key Laboratory of Non-conventional Oil and Gas Geology of China Geological Survey,Beijing 100029,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第2期162-170,共9页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家科技重大专项(2016ZX05034)
中国地质调查局基础地质调查项目(121201021000150011)
关键词
石门剖面
广西
英塘组
石炭系
有机碳
Shimen section
Guangxi
Yingtang Formation
Carboniferous
TOC
