张瑜,闫建萍,贾祥娟,李艳芳,邵德勇,于萍,张同伟
ZHANG Yu,YAN Jian-ping,JIA Xiang-juan,LI Yan-fang,SHAO De-yong,YU Ping,ZHANG Tong-wei
摘要:
选取四川盆地长宁县双河镇上奥陶统五峰组—下志留统龙马溪组新鲜露头样品23个,渝东南黔浅1井岩心样品14个,运用氮气吸附法进行了孔径分布表征,并结合TOC、矿物组成含量和含气量在垂向上的变化及相关性分析,探讨了控制页岩孔隙发育的主要影响因素及其与页岩含气性的关系。结果表明:页岩孔隙以四周开放的具有平行板结构的狭缝孔为主,平均孔径为3.76~8.53nm,主体孔径以2~30nm的介孔为主。总体来看,BET比表面积和孔体积在五峰组—龙马溪组底部大,向上减小并趋于稳定,与TOC变化趋势一致,呈较好正相关性,表明有机质是控制龙马溪组页岩孔隙发育的主要因素。在TOC含量相近时,黏土矿物含量高的样品具有更大的比表面积,页岩中纳米孔隙的发育同时受黏土矿物的影响。四川盆地五峰组—龙马溪组底部TOC和脆性矿物含量高,有机孔发育,页岩含气性好,是页岩气储层压裂改造的优选层位。
中图分类号:
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