东营凹陷北部盐22区块砂砾岩储层储集空间类型及控制因素

Reservoir Space type and control factors of Sandy Conglomerate Reservoir in Member 4,Shahejie Formation,Yan 22 Area of northern Dongying Sag

通过岩心观察、薄片鉴定、物性分析和扫描电镜观察等技术手段,研究了东营凹陷北部陡坡带盐22地区沙四段砂砾岩储层的岩石学及物性特征、储集空间类型及其控制因素。研究结果表明,盐22地区沙四段砂砾岩储层岩性以砾岩和含砾砂岩为主,整体上为中孔低渗和低孔特低渗储层;储集空间类型包括孔隙型、裂缝型和孔隙-裂缝复合系统三大类,以次生溶蚀孔隙、裂缝和孔隙-裂缝复合系统为主;次生孔隙发育的主要控制因素是碎屑颗粒成分、成岩作用和流体性质;裂缝发育的主要控制因素是构造运动和成岩作用。

The petrophysics,physical property,reservoir space type and its control factors of the sandy conglomerate in member 4,Shahejie formation of Yan 22 area in the northern Dongying Sag were studied by means of core observation,thin section analysis,physical property analysis,scanning electron microscopy.The results show that both of the com-positional and textural maturity grade of rock are low,and reservoirs are mainly medium-porosity low permeability and low-porosity extra-low-permeability;solution pore,fracture and pore-fracture compound system are the main reservoir spaces;main controlling factors of reservoir spaces are tectonic movement,diagenesis and the components of clastic particles.