摘要
根据钻井、测井及分析鉴定资料，砂岩储层的岩石学特征复杂，岩屑及填隙物较多，矿物及结构成熟度偏低；但储层物性较好，总体属于中孔低渗型储层。孔隙类型以粒间孔隙为主，少量长石、岩屑溶孔及微裂缝。毛管压力特征反映出4种基本储集类型，进汞饱和度普遍较低，喉道半径偏小综合分析认为，砂岩中稳定矿物含量低，抗压抗蚀变能力弱，碳酸盐胶结作用普遍，粘土矿物舍量较高是影响储层物性的主要地质因素。
According to drilling, logging and analysis information, petrological characteristics of sandstone reservoirs are complex, with more lithic fragment and interstitial filling material, low mineral and structure maturity; but better reservoir properties, belonging to the mid-porosity and low permeability reservoirs in general. Pore types are mainly intergranular pores, with a small amount of feldspar, debris dissolved pores and micro-cracks. Capillary pressure features reflect four kinds of basic characteristics of the reservoir type. Intrusive mercury saturation is generally low due to the small throat radius. Comprehensive analysis shows the stability minerals in sandstone are of low content, low capacity of compressive resistance and corrosion-resistance, and universal carbonate cementation. A high content of clay minerals is the main geological factor that affects the reservoir properties.
