黔南拗陷独山上司组储层特征及主控因素

通过大量的铸体薄片、物性测试、扫描电镜等资料,对黔南拗陷独山甲刀寨下石炭统上司组储层特征和主控因素进行深入分析.认为上司组储集岩以泥微晶灰岩、粉晶白云岩为主,次为亮晶生物碎屑灰岩及云质灰岩.上司组经历了由混积陆棚向开阔碳酸盐台地演化的环境转变.通过对上司组储层的物性资料分析和薄片观察发现,其储集空间类型以裂缝为主,次为...

Reservoir characteristics and controlling factors of Shangsi Formation in Dushan,South Guizhou sag

The reservoir rocks in Shangsi Formation of Lower Carboniferous in Jiadaozhai of South Guizhou sag are marlstones and crystal powder dolomites,followed by bioclast limestones and dolomitic limestones.The sedimentary environment of Shangsi Formation is from the mixed continental shelf to the open carbonate platform.Based on the slice observation and physical properties of the reservoir in Shangsi Formation,this article indicates that the main reservoir spaces are fractures,followed by intergranular(intragranular) dissolved pores and intercrystalline(dissolved) pores.It is a fractured-porous reservoir with low porosity and low permeability.The development of the reservoir is determined by diagenesis.The cementation,compaction and recrystallization have destroied most original pores,and late-stage dolomitization,dissolution and tectonic disruption have formed many secondary pores and fractures.Because of these,the performance of the reservoir is promoted immensely.