孙梦迪;于炳松;陈颂;夏威;叶若辰;

• 1:中国地质大学(北京)地球科学与资源学院

• 2:中国地质大学(北京)地质过程与矿产资源国家重点实验室

• 3:中国地质大学(北京)数理学院

摘要(Abstract)：

为探究渝东南地区下寒武统牛蹄塘组页岩储层特征及甲烷吸附能力,对渝科1井和酉科1井钻遇的牛蹄塘组富有机质页岩进行采样;根据场发射扫描电镜的观察结果,以及全岩X线衍射矿物、有机碳质量分数、有机质成熟度、比表面积和孔径等测试结果,分析页岩的储层特征;采用CH4等温吸附法测定页岩甲烷吸附饱和吸附量并讨论其主控因素,采用NLDFT法和BJH法计算页岩孔隙体积.实验测试结果表明:牛蹄塘组页岩硅质矿物质量分数平均为54.60%,黏土矿物质量分数平均为34.80%,主要为伊利石,有机碳质量分数平均为2.46%,等效镜质体反射率平均为3.12%.在页岩孔隙体积(0.614~400.000nm)中,中孔体积占61.7%,微孔体积占23.4%,微孔体积贡献主要的比表面积.微孔和宏孔主要存在于有机质,有机碳质量分数是影响页岩甲烷吸附能力的最主要因素.有机质成熟度大于2.7%以后,有机质中微孔体积、中孔体积和宏孔体积的比例相对稳定,对页岩甲烷吸附能力影响不大.硅质矿物质量分数的增加在一定程度上减弱页岩对甲烷的吸附能力.有机组分对渝东南地区下寒武统牛蹄塘组页岩吸附能力的评价至关重要,同时也应考虑无机矿物对页岩储层开发的影响.

关键词(KeyWords)：储层特征;吸附能力;牛蹄塘组;下寒武统;渝东南地区

Abstract:

Keywords:

基金项目(Foundation):高等学校博士学科点专项科研基金项目(20120022130001);; 国土资源部全国页岩气资源战略调查项目(2009GYXQ15-04);; 贵州省页岩气资源调查评价项目(2012GYYQ-01)

作者(Author):孙梦迪;于炳松;陈颂;夏威;叶若辰;

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