川南丹凤—塘河地区嘉陵江组储层特征及储层主控因素

四川盆地泸州古隆起是重要的油气勘探领域,其嘉陵江组为该区主力产层。本文以碳酸盐岩储层地质学理论与方法为指导,以钻井岩心观察、铸体薄片鉴定、扫描电镜和岩心物性、孔隙结构等资料分析为基础,结合最新资料和新认识,对丹凤—塘河地区嘉陵江组嘉嘉一—二1和嘉二3亚段储层的岩石学特征、储集空间类型、孔隙结构特征、物性特征及电性特征进行了更深入研究。研究表明,研究区嘉一—嘉二1和嘉二3亚段储集岩以粉细晶白云岩和颗粒云岩为主,储层空间以次生孔隙(粒间溶孔、白云岩晶间孔)为特征,储层总体上为孔隙型和裂缝-孔隙型储层。研究认为:①频繁的海平面升降和台内滩相带控制了优质储层分布范围和规模;②成岩期埋藏白云岩化作用是储层形成的基础;③岩溶作用扩大了储层发育范围,改善了储层物性。

Characteristics and major controlling factors of Jialingjiang Formation reservoirs in Danfeng-Tanghe area, southern Sichuan Province

Luzhou uplift in Sichuan basin is an important area for oil and gas exploration,and Jialingjiang Formation is the main producing formation in this area.Under the guidance of theories and methods of carbonate reservoir geology and on the basis of core observation,cast thin section analysis,SEM and analytical data of physical property and pore structure,in combination with new information and new achievements obtained recently,the authors studied in detail the petrologic characteristics of Jialingjiang Formation,the storage space type,pore features and electrical performance characteristics of Jia II1-Jia I and Jia II3 reservoirs in Danfeng-Tanghe area.Researches show that Jia II1-Jia I and Jia II3 reservoirs in the study area are mainly powder fine-crystalline and grained dolomite,and the accumulation spaces are mainly secondary pores(intergranular dissolved pores and dolomite intercrystalline pores).The reservoirs are mainly of the pore type and the fracture-pore type.Researches show that ① the beach of platform facies controlled the distribution scale and range of the reservoir;② dolomitization constituted the basis of reservoir composition;③ karstification and tectonic action played a most important role in expanding the reservoir distribution and improving the physical character of the reservoir.