车排子油田沙湾组稠油油藏储层特征及主控因素研究

STUDY ON RESERVOIR CHARACTERISTICS AND MAIN CONTROLLING FACTORS OF HEAVY OIL RESERVOIRS OF SHAWAN FORMATION IN THE CHEPAIZI OILFIELD

准噶尔盆地西北缘的车排子油田M井区沙湾组沙一段油藏是新疆油田在中石油矿权内首次发现的新近系油藏。储层主要以灰色砂岩、含砾砂岩为主,原生粒间孔发育,剩余粒间孔次之,属于高孔高渗储层,油层电阻率低,层内钙质夹层发育,且分布规律复杂。经过多项技术联合攻关研究认为,影响储层储集性能、夹层分布和电性特征的主要因素为沉积环境、成岩作用和地层水性质。有利储层主要分布在水下分流河道和河口砂坝微相发育区域,钙质夹层主要受沉积环境和后期成岩作用的影响,低电阻特征受地层水性质的影响。

The reservoir of member 1 of Shawan formation in the Chepaizi oilfield that is located in the NorthwestEdge of Junggar Basin is a Neogene reservoir that was firstly found in Xinjiang oilfield. The reservoir lithologymainly is gray sandstone and pebbled sandstone, and the main type of pore is primary intergranular pore, the sec-ond is residual intergranular pore. It blongs to high porosity with high permeability reservoir. The resistivety ofpetroleum deposit is lower,and there are many calcareous intercalations that distribute complexly in the reser-voir.Through multiple technology joint research, it is concluded that depositional environment,diagenesis andthe properties of formation water influenced separately the performance of reservoir, interbed distribution andelectrical characteristics. The favorable reservoir distributes mainly underwater distributary channel and channelmouth bar. Depositional environment and post sedimentary diagenesis influenced the distribution of calcareousintercalations. The properties of formation water caused the lower resistance characteristics.