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石炭系KT-Ⅱ碳酸盐岩层是扎纳若尔油田的主要勘探开发层之一,研究成岩作用对储层孔隙演化的影响具有重要意义。在薄片观察及碳氧同位素、阴极发光、流体包裹体等地化分析的基础之上,阐明了研究区KT-Ⅱ碳酸盐岩层的主要成岩作用类型、成岩序列及其对孔隙演化的影响,并得出如下结论:(1)对储集物性有明显影响的成岩作用主要包括压实-压溶作用、胶结作用、溶蚀作用及破裂作用等;(2)划分出滩相亮晶颗粒灰岩和潮坪相灰泥石灰岩两类成岩演化模式及孔隙演化模式,前者可细分为亮晶有孔虫石灰岩和亮晶砂屑鲕粒石灰岩成岩及孔隙演化模式两种亚类;(3)成岩作用是储层储集物性的主控因素之一,岩石类型(受沉积微环境的控制)的差异决定着不同早期成岩响应,进而影响后期成岩改造,并控制着差异性储层的形成。因此,在沉积基础之上的成岩改造对储层储集性能差异性分布具有同样重要的控制作用。
Carboniferous KT-Ⅱ carbonate rock is one of the main exploration and development zones in Zhanarjuo Oilfield. It is of great significance to study the effect of diagenesis on the evolution of reservoir porosity. Based on the observation of thin sections and the geochemical analysis of carbon and oxygen isotopes, cathodoluminescence and fluid inclusions, the types of diagenesis and diagenetic sequences of KT-Ⅱ carbonate rocks in the study area and their effects on the evolution of the pores are elucidated. The main conclusions are drawn as follows: (1) Diagenesis that has significant effect on reservoir properties mainly includes compaction-depressurization, cementation, dissolution and rupture; (2) And tidal flat facies limestone two types of diagenetic evolutionary model and pore evolution model, the former can be subdivided into sphalerite foraminiferal limestone and bright crystalline sandstone oolitic limestone diagenesis and pore evolution mode of two sub-categories; (3) diagenesis Effect is one of the main controlling factors of reservoir properties. The difference of rock type (controlled by sedimentary microenvironment) determines different early diagenetic responses, which in turn affects late diagenetic alteration and controls the formation of differential reservoirs. Therefore, diagenetic alteration based on sedimentation plays an equally important role in controlling the differential distribution of reservoir properties.