砂西油田低渗透储层成岩储集相及储集空间演化模式  

Diagenetic reservoir facies and pore space evolution of low permeability reservoir in Shaxi oilfield

作　　者：周恒涛[1] 彭仕宓[1] 李海燕[1] 

机构地区：[1]中国石油大学资源与信息学院

出　　处：《煤田地质与勘探》2006年第6期22-26,共5页Coal Geology & Exploration

基　　金：国家973项目重大基础研究前期研究专项(2002CCA00700)

摘　　要：综合应用取心井的岩石铸体薄片、图像分析、扫描电镜、电子探针能谱、阴极发光、粘土矿物X衍射分析和镜质体反射率等实验测试资料,研究了E31储层的成岩作用、成岩演化序列和成岩阶段划分。通过分析低渗透储层成岩作用对储集物性的影响,认为造成本区储层砂岩较低渗透率的主要成因机理是成岩期各种自生矿物的充填和胶结作用。根据成岩作用及其特有的储集空间组合,将E31储层划分为4种成岩储集相类型:A相———不稳定组分中强溶解次生孔隙成岩储集相、B相———中等胶结中强压实残余粒间孔成岩储集相、C相———碳酸盐强胶结成岩储集相、D相———早期硬石膏强胶结成岩储集相。详细阐述了低渗透储层中各类成岩储集相的特征及其形成机制,并探讨了其储集空间类型及演化模式。Taking first member of lower Ganchaigou Formation （E3^1） in Shaxi oilfield as study case, based on the analytic data of casting thin section, scanning electron microscope, electron probe energy spectrometry, cathodoluminescence microscope, x-ray diffraction of clay minerals, vitrinite reflectivity of well core samples, the diagenesis, diagenetic sequences and stages of the formation have been studied. Through analyses of effect on the reservoir property of diagenesis and its phases, it indicated that the genetic mechanism of the low permeability of this area is the filling and cementation of autogenetic mineral during diagenesis. According to the diagenesis and characteristic pore space combination, the reservoir rocks of E3^1 can be divided into 4 types of diagenetic reservoir facies（ DRF）. Facies A： DRF with middle to strong dissolution of unstable ingredients to form secondary pores; facies B： DRF with middle to strong compaction and middle cementation with residual intergranular poresl facies C： DRF with strong carbenate cementation; facies D： DRF with strong cementation of early anhydrite. The characteristics and origin of each diagenetic reservoir facies have been described in detail. Finally the types and pore space evolution have been discussed.

关 键 词：砂西油田 古近系 成岩作用 成岩储集相 储集空间演化 

分 类 号：P618.13[天文地球—矿床学]