鄂尔多斯盆地延长探区陆相页岩气储层特征

发布时间：2018-03-24 23:23

  本文选题：陆相页岩气　切入点：储层特征　出处：《煤田地质与勘探》2017年06期

【摘要】：结合我国陆相页岩分布特征,以鄂尔多斯盆地延长探区为例,对钻孔岩心样品进行有机地球化学、X射线衍射、孔隙度测定、扫描电镜、气体吸附等多种实验分析,研究陆相页岩气储层特征。结果表明,延长探区延长组陆相页岩厚度较大(平均50 m),有机质丰度高(平均TOC为4.86%),有机质类型主要为Ⅱ型,热演化程度处于成熟阶段(Rran为0.84%~1.10%);页岩中黏土矿物质量分数高(21.8%~71.5%,平均47.3%),石英质量分数较低(10.8%~44.9%,平均22.3%),脆性指数相对较小(27.1%~77.2%,平均49.6%),表明页岩储层具有脆性和可压裂性;延长组页岩孔隙度主要分布在1%~3%,孔隙类型多样,以粒间孔和粒内孔为主,其次是晶间孔、微裂缝、溶蚀孔和有机质孔,为页岩气赋存提供了储集空间;延长组页岩总含气量为1.60~6.67 m3/t,显示出较好的含气性。
[Abstract]:Taking the Yanchang exploration area of the Ordos Basin as an example, the organic geochemical X-ray diffraction, porosity measurement, scanning electron microscope, gas adsorption and other experiments were carried out on the core samples of the borehole in the light of the distribution characteristics of the continental shale in China. The characteristics of continental shale gas reservoir are studied. The results show that the Yanchang formation in Yanchang exploration area has a large thickness (average 50 mg) and high organic matter abundance (average TOC is 4.86%), and the type of organic matter is mainly type 鈪，

本文编号：1660529