摘要
运用常规偏光显微镜、电镜扫描、阴极发光、常规物性、粒度分析、压汞分析等方法对鄂尔多斯镇北地区长81储层的成岩作用和成岩序列的研究结果表明,储集岩主要以中—细粒岩屑长石砂岩为主,其次为长石岩屑砂岩;储集空间主要以粒间孔、长石溶孔、岩屑溶蚀孔、胶结物溶蚀孔、微孔隙为主,具有低孔低渗的储集特征;压实作用和胶结作用对砂岩储层具有一定的破坏性,溶蚀作用和裂缝则有效的改善了储层的孔隙结构;长81储层砂岩处于晚成岩阶段A期,部分以进入晚成岩B期。
A lot of analysis and methods,such as conventional polarizing microscope,electronic microscope scanning,cathodoluminescence,conventional physical property,grain size,and mercury injection,have been applied to studying both diagnesis and diagenetic sequences of Chang 81reservoir in Zhenbei area,Ordos Basin. Results show that( 1) this reservoir is mainly composed of middle to fine- grained lithic arkose,and feldsparthic litharenite for the second;( 2) the reservoir space primarily includes intergranular pore,feldspar and debris dissolution pore,cement dissolution pore,and micropore,which are characterized by low porosity and permeability;( 3) both compaction and cementation are destructive to sandstone reservoir whereas both dissolution and fracture may effectively improve its porous structure; and( 4) the reservoir is in the late diagenesis A- substage,however,the part has entered B- substage.
出处
《天然气勘探与开发》
2014年第1期20-24,29,共6页
Natural Gas Exploration and Development
关键词
成岩作用
储层特征
镇北地区
diagenesis,reservoir characteristics,Zhenbei area
作者简介
秦卫军，男，1985年出生，硕士在读；研究方向：沉积和储层地质学。地址：（710065）陕西省西安市雁塔区电子二路十八号西安石油大学地球科学与工程学院。电话：18629453626。E-mail：317713746@qq．com
