摘要
运用储层地质学理论，结合岩石薄片、铸体薄片、压汞资料、物性资料以及扫描电镜和X射线衍射结果，对合水地区长8砂岩储层岩石学特征、孔隙类型及结构特征进行了研究，并分析了影响储层储集性能的主要因素。研究表明，长8岩石类型以当屑长石砂岩为主，填隙物主要为黏土矿物、碳酸盐矿物；原生孔隙和次生溶蚀孔隙构成了该储层的主要储集空间，孔隙结构类型划分为4类，其中优质储层孔隙结构主要为小孔细喉型和小孔微细喉型；沉积作用与成岩作用是影响储层物性的关键因素，
By application of reservoir geology theory, the petrological characteristics, types and structural features of the pores of the Chang8 sandstone reservoirs in Heshui area of Eastern Gansu are studied with combination of the rock thin section, analysis of casting lamella, mercury iutrusion analysis, physical properties, SEM, and X-ray diffraction data. The main factors of affecting the capability of oil/gas reserving of the reservoirs are analyzed. Studies have shown that the rock types of Chang8 take fehtspathie lithic sandstone as the dominated. The interstitial material is mainly clay minerals and carbonate minerals. The primary and secnndary dissolution pores constitute the main reservoir space of the reservoirs. The pore structures are divided into four categories. The pore structure of quality reservoirs is mainly small-pores fine-throats type （ throat＇ s radius 0. 1 ~ 1 μm） and small-pores tiny-throats type （ throat＇ s radius 0. 01-0. 1μm）. The deposition and diagenesis are key factors affecting the reservoir physical properties.
关键词
储层特征
孔隙结构
沉积相
成岩作用
合水地区
reservoir cbaracteristics
pore structure
sedimentary facies
diagenesis
Heshui area
