富县西部长2油层组储层控制因素分析

通过岩心薄片鉴定、扫描电镜和物性等分析资料,对富县西部长2段储层岩石学特征、孔隙类型和物性特征等进行研究,分析影响储层储集性能的主要控制因素。研究表明:以三角洲前缘的水下分流河道沉积的长2储层具有较低的成分成熟度和较高的结构成熟度,是控制储层发育的沉积因素;孔隙类型以粒间孔、溶蚀孔、微孔隙和裂隙为主,次生溶孔和微裂隙的存在为储层提供了储集空间和渗流通道;本区的成岩阶段已进入晚成岩A期,主要的成岩作用有压实-压溶、碳酸盐岩充填和溶解作用,不同成岩阶段的成岩作用对储层物性的改造不同,因此也控制着储层的储集性能。

Chang 2 reservoir controlling factor analysis in western-Fuxian area,Ordos Basin

By analyzing the data of drilling cores,costing thin sections,microscope flake and physical property,the paper studied the petrology characteristics,physical property,pore type and so on of Chang 2 reservoir in western-Fuxian area,as well as the reservoir characteristics and its controlling factors.The results shows:The Chang 2 resevior,deposited by delta front of the underwater distributary channel sand,have low compositional maturity and higher maturity characteristics of the structure,which is the depesion factors controlling reservoir development.The main types of pore were primal grain pore and secondary pore,Secondary solution pores and micro cracks in Chang 2 reservoir provides storage space and flow channel.The region has entered a late diagenetic stage A,the main diagenetic compaction include pressure solution,carbonate filling and dissolve.Different stages of diagenesis lead to different reservoir properties,and therefore,controls the reservoir performance.