王秀平1,2，牟传龙2,3，葛祥英2,3，陈小炜2,3，周恳恳2,3，王启宇2,3，梁薇2,3，陈超2,3
WANG Xiu-ping1,2,MOU Chuan-long2,3,GE Xiang-ying2,3,CHEN Xiao-wei2,3,ZHOU Ken-ken2,3,WANG Qi-yu2,3,LIANG Wei2,3,CHEN Chao2,3
摘要： 为了分析页岩气储层中黏土矿物特征及其对页岩气勘探、开发的影响，以四川盆地南部及其周缘下志留统龙马溪组黑色富有机质页岩发育层段为主要研究对象，利用X-射线衍射分析，并与大量的薄片和背散射分析资料相结合，较系统地揭示了研究区龙马溪组黏土矿物的发育及分布特征。研究表明：黏土矿物以绿泥石+伊/蒙混层+伊利石为主，具有陆源碎屑和次生成因2种类型，主要分布在盆地中心及其边缘地区，具有高伊利石、伊/蒙混层含量，较高绿泥石含量的特点|黏土矿物的类型和含量具有一定的指相意义，平均含量大于50%的地区，主要为深水陆棚沉积，在30%～50%之间的地区通常为浅水陆棚沉积，小于30%的地区为海陆过渡相沉积|龙马溪组沉积时为半干旱—干旱的气候，成岩过程中水介质具有盐度较高、偏碱性，富K+的特点|成岩演化已达到晚成岩阶段，烃类演化至干气阶段，具备形成页岩气的气源条件|根据黏土矿物对页岩气储集空间的影响，并与有机碳的展布特征相叠合，渝东南地区的綦江—武隆—彭水一带、黔西—滇北地区的雷波—筠连—兴文—仁怀—桐梓近EW向展布的一带，以及研究区西北部的峨边西河地区为页岩气的有利区，位于盆地中心的宜宾—江津—涪陵呈NE—SW向展布的区域，为次级有利区。
中图分类号:
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