溱潼西斜坡阜三段储层特征及主控因素研究

Reservoir characteristics and main controlling factors of Fu 3 member of Qintong west slope

溱潼西斜坡阜三段发育三角洲前缘薄层砂,储集空间以粒间孔及次生晶间微孔为主,局部发育溶蚀孔。胶结作用主要为黏土矿物胶结,储层综合评价为中低孔、低渗特低渗、细喉道型储层。沉积微相类型和成岩作用是储层物性的控制因素,水下分流河道微相发育区储层物性较好,远砂坝发育区储层物性较差,压实作用和胶结作用对储层具有破坏性,溶蚀作用有利于储层物性的改善。溱潼西斜坡阜三段储层可划分为Ⅰ, Ⅱ、Ⅲ三类。

Thin layer sand of delta front was developed in Fu 3 member of Qintong west slope and the reservoir space was mainly composed of intergranular pores and secondary inter-crystalline micropores,and dissolution pores were developed locally.The cementation is mainly of clay mineral cementation,and the comprehensive reservoir evaluation is medium and low porosity,low and ultra-low permeability and fine throat reservoir.The types of sedimentary microfacies and diagenesis are the controlling factors of reservoir physical properties.The reservoir physical properties are better in the area of micro-facies development of underwater distributary channel,and worse in the area of distal bar development.Compaction and cementation are destructive to the reservoir,while the dissolution is conducive to the improvement of reservoir physical properties.The reservoirs in the Fu 3 member of Qintong west slope can be divided into Ⅰ,Ⅱ and Ⅲ categories.