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利用铸体薄片、扫描电镜、图像孔隙、高压压汞等实验,研究分析苏里格苏48区块盒8段储层微观孔隙结构。结果表明:盒8段储层岩石类型主要以粗粒、中-粗粒岩屑石英砂岩、石英砂岩为主,砂岩类型以岩屑石英砂岩、石英砂岩为主,碎屑成分主要为石英、岩屑,石英含量最高;填隙物含量较高,以高岭石、硅质、伊利石、碳酸盐岩胶结物为主,少数井区发育绿泥石及菱铁矿胶结物,胶结类型以次生加大-孔隙式为主;盒8段储层发育的孔隙类型以粒间孔、岩屑溶孔和晶间孔为主,孔隙组合类型主要有晶间孔-溶孔、溶孔-晶间孔、微孔。盒8段储层整体孔喉较细,按毛管压力曲线来看,Ⅰ、Ⅱ类为主要开发目标,物性较好,孔隙大,喉道粗,孔喉分布均匀,孔隙连通性好,流体易流动,孔隙储集空间较大,有利于天然气的聚集,Ⅲ类开发价值次之,Ⅳ类开发价值不大。
The microcosmic pore structure of the 8th member reservoirs in the Sulige Su 48 block was studied and analyzed by means of casting thin films, scanning electron microscopy, image pores and high pressure mercury intrusion. The results show that the reservoirs in Block 8 are mainly composed of coarse-grained, medium-coarse-grained lithic quartz sandstone and quartz sandstone, and the sandstone type is mainly lithic quartz sandstone and quartz sandstone. The detrital components are mainly quartz and rock The content of quartzite is the highest, while that of kaolinite, siliceous, illite and carbonate cements is the highest. The chlorite and siderite cement are developed in a few wells, and the cementation types are secondary The pore types developed in reservoir 8 are mainly intergranular pores, lithic solution pores and intergranular pores. The types of pore assemblages are intergranular pores-dissolved pores, dissolved pores-intergranular pores Hole, micropore. According to the capillary pressure curve, Class I and II are the major development targets with good physical properties, large pores, thick throats, uniform distribution of pore throats, good pore connectivity and easy fluid flow Flow, pore storage space is larger, is conducive to the accumulation of natural gas, followed by the development of Class Ⅲ, Ⅳ development of little value.