塔南凹陷储层孔隙特征及其发育成因

塔南凹陷位于海拉尔—塔木察格盆地中部断陷带的最南端,其主要含油层位为南屯组(细分为南一段和南二段)和铜钵庙组。文中利用大量岩心资料,通过普通薄片、铸体薄片、扫描电镜等综合分析了研究区南屯组和铜钵庙组的储层岩石类型及孔隙特征。结果表明,铜钵庙组主要为凝灰质砂岩储层,南一段主要为普通砂岩储层,南二段主要为砂岩储层,且均发育次生孔隙。经分析认为,研究区储层发育主要受岩石类型、钠长石化、碎屑颗粒包壳3个因素的控制。

Pore characteristics and origin of reservoirs in the southern Tamtsag Sag

The southern Tamtsag Sag is localed in the soulhernmosl central rift of Hailaer-Tamlsag Sag. The main oil hearing layers are Tongbomiao and Nantun Formation（he first and second member of Nanhm Formation）. Thecore data combined with thin section, casting thin section and scanning eleelronic microscope were applied Io study the rock types and pore characteristics of Nantun and Tongbomiao Formation. The result shows thai the reserw~ir of Tongbomiao Formation is mainly of tuffaceous sandstone, the reservoir of the first member of Nantun Formation is mainly of ordinary sandstone. the reservoir of the second member of Nantun Formation is mainly of sandstone, and these reservoirs all developed secondary pores. It is also eonsidered that the reservoirs in the study area are mainly controlled by rock types, albitization and elastic particles shell.