涠西南凹陷涠洲10-A油田及围区流三段储层特征及控制因素

本文通过薄片鉴定、扫描电镜、物性和孔隙结构分析,对涠西南凹陷涠洲10-A油田及围区流三段储层特征和控制因素展开研究。结果表明:研究区流三段储层岩石类型主要为长石石英砂岩,由含砾砂岩和细砂岩组成。储集空间以粒间孔、粒间溶孔为主,次为粒内溶孔,还见少量裂缝。砂砾岩储层主要为特低孔和中孔特低渗储层;储层物性受到岩性、沉积环境和成岩作用的共同控制。综合分析认为研究区流三段中以中粗砂岩为主,发育滨浅湖滩坝、分流河道、水下分流河道和河道沉积微相的储集砂体物性相对较好,可作为后续勘探开发研究目标。

Reservoir characteristics and control factors of member 3 of the Liushagang Formation, WZ10-A oilfield and surrounding areas, Weixinan sag

Based on the thin section identification, scanning electron microscope, physical property and pore structures, this paper discusses the reservoirs characteristics and controlling factors of Member 3 of the Liushagang Formation in WZ10-A Oilfield and surrounding areas, Weixinan Sag in detail. Our results shows that the sandstones types of Member 3 of Liushagang Formation is feldspar quartz sandstone, the rock types intervals are gravel-bearing sandstone and fine sandstone. The dominant reservoir space was intergranular pores and intergranular dissolved pores, followed by intergranular dissolve pores, and rare fractures. The sandy conglomerate has ultra-low porosity and ultra-low permeability reservoir, and middle porosity and ultra-low permeability reservoir. Lithology, sedimentary facies and diagenesis are the factors affecting reservoir property. Comprehensive analysis shows that the medium-coarse sandstones are high quality reservoirs, the beach bar, distributary channels, distributary channel of fan delta front and riverway are fine reservoirs. It is the target of exploration and exploitation.