苏77区块山2~3段储层特征及分类评价

苏里格气田东区北端上古生界山西组山23段是天然气的主力产层之一,储层段主要发育辫状河沉积,心滩微相为最有利的沉积相带。通过铸体薄片、储层物性、压汞及扫描电镜等资料对储层特征进行分析,研究结果表明:储层岩石类型以石英砂岩为主,有矿物成熟度高而结构成熟度低的岩石学特点,孔隙类型以粒间溶孔和晶间孔为主,总体物性较差,属于典型的低孔低渗储层。研究区较强的压实作用、胶结作用是形成低孔低渗的主要因素,溶蚀作用改善了储层物性;研究区山23段分为4类,其中以Ⅱ类储层较发育。

Reservoir characteristics and evaluation in the Paleozoic Shan_2~3 of S77

Neopaleozoic shanxi is one of the principal natural gas producing formations in eastern northern of Sulige gas field.Reservoir interval mainly developed braided fluvial deposition,and batture microfacies is the most favorable sedimentary facies belts.Through cast thin section,reservoir properties,mercury injection data and scanning electron microscope analysis,the reservoir characteristics have been studied.The results show the petrology type is mainly quartz sandstone,including high maturity of mineral and low textural maturity of petrology characteristics,of which the overall properties are poor,belonging to the low porosity and low permeability.The strong compaction and cementation of the research zone are the major factors to the low porosity and low permeability.While the dissolution plays an active role on reservoir properties.Based on the foregoing analysis the reservoir interval of the research zone is divided into four categories,andⅡclass of reservoirs is developed.