下扬子芜湖地区古生界泥页岩微孔-超微孔隙发育特征及其意义  

The development characteristics and the significance of the micro-ultra micro aperture of Paleozoic shale in Wuhu area,Lower Yangtze Platform

作　　者：江丹[1] 蔡周荣[2] 向俊洋 JIANG Dan CAI Zhou-rong XIANG Jun- yang(Research Resources Center,South China Normal University,Guangzhou Guangdong 510006 School of Marine Sciences,Sun Yat-sen University,Guangzhou Guangdong 510006, China)

机构地区：[1]华南师范大学实验中心,广东广州510006 [2]中山大学海洋科学学院,广东广州510006

出　　处：《电子显微学报》2017年第3期250-257,共8页Journal of Chinese Electron Microscopy Society

基　　金：国家重点基础研究发展计划(973计划)(No.2009CB219406)

摘　　要：下扬子芜湖地区是我国页岩气勘探的重点区域之一,页岩中孔隙的发育对页岩气保存有重要影响。本文通过野外手标本的肉眼观察、钻井岩芯的显微镜下以及扫描电镜(SEM)观察,形成多尺度的微孔-超微孔连续分析手段,对页岩中的孔隙发育特征进行了研究,认为地表露头由于泥页岩页理发育和风化剥蚀作用,构造裂隙格外发育,致使泥页岩呈破碎状态,往深部裂隙发育则趋于稳定,可分为构造成因和非构造成因两种类型,孔隙连通性较好;芜湖地区的古生界泥页岩同样发育纳米级的孔隙,包括粒间孔、粒内孔、有机质孔以及一些微裂隙,其孔隙较独立,连通性较差。这些微孔-超微孔隙的发育可为页岩气提供更多的储存空间,但过于发育也可能会造成页岩气的散失。Lower Yangtze Platform is the key area of shale gas exploration in our country. The microscopic analysis of field hand specimens and core drilling rocks showed that the structural fracture of the Palaeozoic shale developed well due to the own lamellation and weathering denudation on the surface outcrop,and the stable development of fracture in the deep. The types of the fracture could be divided into structural genesis and non-structural genesis. Scanning electron microscopy （ SEM） observation of drilling core showed that the nanoscale aperture of Palaeozoic shale in Wuhu area also developed well, and the types of apertures included intergranular pore, intragranular pore, organic hole and some small fracture. The micro-ultra and micro apertures could provide more storage spaces for shale gas. Meanwhile, overmuch apertures could lead to the loss of shale gas.

关 键 词：孔隙 古生界 页岩 芜湖地区 下扬子地台 

分 类 号：P618.13[天文地球—矿床学]