徐勇;吕成福;陈国俊;杨巍;仲佳爱;薛莲花;沈怀磊;

• 1:甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室
• 2:中国科学院大学
• 3:中海油研究总院

摘要(Abstract)：

页岩储层的孔隙结构对页岩气资源评价和勘探开发具有重要意义。通过高压压汞法、低压氮气吸附法、氩离子抛光-场发射扫描电镜对川东南龙马溪组页岩微观孔隙结构特征进行了深入的研究,分析了微观孔隙发育影响因素。研究表明,页岩排驱压力比较高,孔隙分选差,退汞率极低,说明孔隙与喉道非常不均一;页岩比表面积为12.330~29.822 m2/g,平均为20.132m2/g;孔体积为0.015 9~0.094 7cm3/g,平均为0.044 5cm3/g;平均孔径为3.484~12.473nm,平均为7.400nm;主体孔隙为中孔,存在一部分的微孔和大孔,氮气吸附-脱附曲线表明孔隙形态以墨水瓶形孔和狭缝状孔为主。孔隙类型可分为有机质孔、原生残余孔、次生溶蚀孔、黄铁矿晶间孔、黏土矿物晶间孔、裂缝6种类型,其中原生残余孔、次生溶蚀孔可达微米级。有机碳含量、石英含量、黏土矿物含量、热演化程度均会影响微观孔隙发育,比表面积和孔体积随有机碳、石英含量的增加而增加;而随黏土矿物含量的增加,比表面积、孔体积呈减小趋势;适宜的热演化程度是纳米级孔隙发育的重要影响因素。

关键词(KeyWords)： 页岩;龙马溪组;孔隙结构;高压压汞法;氮气吸附法;扫描电镜;影响因素

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41272144;41402130);; 2012年中国科学院西部之光项目暨甘肃省自然科学基金项目(Y212CF1LCF);; 中国科学院油气资源研究重点实验室开放基金项目(KFJJ2010-04)

作者(Author): 徐勇;吕成福;陈国俊;杨巍;仲佳爱;薛莲花;沈怀磊;

Email:

DOI:

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