【摘要】 鄂尔多斯盆地陇东地区三叠系延长组长6—长8段储层以长石砂岩为主,结构、成分成熟度均较低,属典型低孔低渗储层.利用岩心、铸体薄片、扫描电镜及物性分析等资料,分析长6—长8储层特征,指出影响砂岩储集性能的主控因素为沉积环境、骨架颗粒物理化学性质、填隙物成分和含量、成岩改造程度.沉积环境是造成储层渗透性偏差、产能低的基本原因,而储层储集性能后期的改变受成岩作用控制,骨架颗粒和填隙物则为成岩改造作用提供物质基础.更多还原

【Abstract】 Feldspar sandstone is the main lithology of Chang6-Chang8 reservoir in Longdong of Ordos basin. Chang6-Chang8 reservoir, with the low structure and component maturity, belongs to typical low porosity and permeability reservoir. According to cores, cast thinning, scanning electric scope and physical properties datum, this paper analyzes Chang6-Chang8 reservoir characteristics and points out the main controlling factors—sedimentary facies & lithology characteristics, physical-chemical properties of framework particle, matrix component & amount and diagenesis. The sedimentary facies & lithology characteristics are the basic reasons that result in low permeability and low production. The change of reservoir ability after sedimentation is under the control of diagenesis. The physical-chemical properties of framework particle and matrix component & amount provide materials for diagenetic reformation.更多还原