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.

Sangonghe of Mobei oilfield is the the main purpose of the interval.Though the data from cast thin section,reservoir properties,and logging data analysed reservoir characteristics.The results show that sandstone reservoir are mainly ranging from lithic sandstone and fine grain-medium-grained lithic sandstone, the cuttings is given priority to with tuff.Research zone sandstone- in the overall property belongs to low porosity, low- low permeability reservoir.Reservoir throat are the typical features of big throat development, and different penetration levels of throat radius size and distribution of big differences.And the inner layers of the macroscopic heterogeneity, interlayer heterogeneity and plane heterogeneity study found these aspects,there are three main categories in mezzanine of Sangonghe delta reservoir: intercalation,argillaceous interlayer,dense intercalation.The research areas develop much sandwich,and heterogeneity is serious.Plane distribution of physical properties also reflects the long strip of underwater distributary channel deposit,and underwater distributary channel property to be significantly better than simply phase in the channel between the edge and the deposition,overall reservoir physical parameters of plane heterogeneity is stronger.