下寺湾油田长8油层组储层特征分析

Analysis of Chang 8 Reservoir Characteristics in Xiasiwan Oil Field

通过对下寺湾油田长8储层的扫描电镜、铸体薄片、压汞及物性等资料的分析,结果表明,研究区该储层以细粒长石砂岩为主;其储集孔隙类型主要为残余粒间孔和长石溶孔;孔隙结构则以细小孔微喉型和微孔微喉型为主。在研究区储层影响因素中,裂缝条件、烃类物质的充注和溶蚀作用为有利因素,而压实作用和胶结作用则为不利因素。

Based on analysis of casting thin sections, SEM observation, mercury injection and physical property data, characteristics of Chang 8 reservoir in Xiasiwan oil field were studied. The results show that Chang 8 reservoir in this area is characterized by fine-grained feldspar sandstone; residual intergranular pore and solution pore developed well. The pore structures can be divided into two types, including small pore-throat type and microscopic pore-throat type. Dissolution and fractures have improved the extra secondary porosity. Compaction and granular cementation have decreased the porosity, and made the permeability worse.