准噶尔盆地西北缘克百断裂下盘二叠系储层成岩作用特征及其孔隙演化

通过岩石薄片、X-射线衍射、扫描电镜、阴极发光及压汞等分析测试手段对储层特征进行了详细地研究，发现准噶尔盆地西北缘克百断裂下盘二叠系储层主要为冲积扇相及扇三角洲相砂砾岩、砾岩和含砾粗砂岩。岩石主要经历了压实、胶结及溶蚀等成岩作用。研究区的孔隙类型主要是残余粒间孔、晶间孔以及碳酸盐、沸石和一些火山岩碎屑被溶蚀所产生的溶蚀孔隙与由构造作用产生的微裂缝。储层现处于晚成岩阶段B期，经过成岩演化后其原生孔隙大部分被破坏，主要以次生孔隙为主\.孔隙演化经历了原生孔隙的破坏、次生孔隙的形成和次生孔隙的破坏3个阶段。

Diagenic Feature and Evolution of Reservoir Pore of Permian Reservoir under the Kebai Fault in the Northwestern Margin,Junggar Basin

Based on integration of thin section, X-ray diffraction analysis, scanning electron microscopy, cathodolumi-nescence and mercury injection, we found out that the Permian reservoir under the Kebai fault in the northwestern margin, Junggar basin was formed in the alluvial fan and fan-delta facies. They were comprised of sandy glutenite, glutenite, and pebbled sandstone. During the diagenesis, the rock assemblages went through compaction, cementation and corrosion. The types of the reservoir pore are primary intergranular pore, intracrystalline pore, carbonate cement and zeolite dissolution pore, and micro fractures formed under tectonic action. The reservoir is in the stage B of late diagenesis, most primary pores were destructed after the diagenetic evolution and the secondary pores were mainly formed. Therefore, the diagenesis would control the physical properties of reservoir in this area. Porosity evolution greatly experienced the three phases, including destruction of primary pores, formation of secondary pores and destruction of secondary pores.