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页岩有机-无机复合型孔隙及其控气作用 ——以川西南地区筇竹寺组为例

作    者:刘忠宝1,2,3, 高 波1,2,3, 武清钊1,2,3, 王濡岳3, 聂海宽3, 张钰莹4
单    位:1 页岩油气富集机理与有效开发国家重点实验室; 2 中国石化页岩油气勘探开发重点实验室 3 中国石油化工股份有限公司石油勘探开发研究院; 4 中国石油大学(华东)非常规油气与新能源研究院
基金项目:受国家科技重大专项专题“海相页岩有机质富集机理研究”等资助
摘    要:
以川西南地区寒武系筇竹寺组页岩为例,应用岩石薄片鉴定、矿物X射线衍射、压汞-吸附联合测定、氦气孔隙度测试、氩离子抛光-扫描电镜观察及页岩气储层测井定量表征等多种技术方法,开展页岩孔隙结构、类型及特征研究,探讨了有机-无机复合型连通孔隙系统的形成机制及其对页岩气富集的控制作用。研究结果表明: ①研究区筇竹寺组富有机质页岩孔隙以介孔和微孔为主,其次为大孔; ②页岩孔隙类型以粒(晶)间孔、黏土矿物层间孔为主,多呈三角形、多边形及狭缝形;其次为有机黏土复合体内的有机质孔,多呈不规则形; ③富有机质页岩具备发育有机-无机复合型连通孔隙系统的条件,有机质孔和无机矿物孔的复合提高了页岩储集能力,控制了页岩气的富集。
关键词:页岩储层; 有机质孔; 无机矿物孔; 有机-无机复合型孔隙; 筇竹寺组; 寒武纪; 四川盆地

Organic-inorganic compound pore system and its gas-controlling significance: a case study of the Cambrian Qiongzhusi Formation in southwestern Sichuan Basin

Author's Name: LIU Zhongbao, GAO Bo, WU Qingzhao, WANG Ruyue, NIE Haikuan, ZHANG Yuying
Institution: Petroleum Exploration and Production Research Institute, SINOPEC
Abstract:
Taking the shale of the Cambrian Qiongzhusi Formation of Southeastern Sichuan Basin as an example, a variety of technical methods including rock thin slice identification, mineral X ray diffraction, pressure mercury?鄄adsorption joint determination, helium porosity measure, argon ion polishing?鄄scanning electron microscope, and quantitative characterization of shale gas reservoir by logging are applied to analyze the types and structures of the shale of the Cambrian Qiongzhusi Formation, and to discuss the mechanism of organic?鄄inorganic compound connected pore systems and the significance on shale gas enrichment. The results show that: (1) the pores in the organic shale are mainly micropores (< 2 nm) and mesopores (2~50 nm), followed by macropores (> 50 nm); (2) the pore types are mainly intergranular pores and clay mineral interlayer pores, mostly triangular, polygonal and slit, then are irregular organic pores in organic matter?鄄clay complex; (3) the rich organic shale has favorable conditions for the development of organic?鄄inorganic composite connected pore systems, which improves shale storage ability and controls the enrichment of shale gas.
Keywords: shale reservoir; organic pore; inorganic pore; organic?鄄inorganic compound pore; Qiongzhusi Formation; Cambrian; Sichuan Basin
投稿时间:2018-04-04  
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