鄂尔多斯盆地靖边油田大路沟区长2储层微观特征

Microscopic characteristics of Chang 2 reservoir in Dalugou area,Jingbian Oilfield,Ordos Basin

根据铸体薄片、扫描电镜、高压压汞、常规物性等分析测试资料,研究了靖边油田长2储层微观特征,结果表明:长2储层为中-细粒长石砂岩,方解石和黏土矿物为主要的胶结物,储层物性总体以中-低孔、低渗为主,残余粒间孔为主要的储集空间。长2储层平均孔隙直径主要分布于20~60μm,平均中值半径小于1μm,可分为4种孔隙结构类型,以Ⅱ类为主,其次为Ⅰ类和Ⅲ类。该研究可为该区的下一步开发提供地质依据。

According to the casting thin sections and scanning electron microscopy(SEM),high-pressure mercury injection and conventional petrophysical analysis test data,The Chang 2 reservoir of Jingbian oilfield was studied,the results show that the Chang 2 is fine-grained feldspar sandstone,calcite cement and clay mineral as the main,the overall reservoir physical property is mainly in-low porosity,low permeability and residual intergranular pore is the main reservoir space.The average pore diameters of Chang 2 reservoir are mainly in the range of 20-60μm,and the average median radius is less than 1μm,which can be divided into four types of pore structure,mainlyⅡ,followed byⅠandⅢ.This study can provide geological basis for the further development of this area.