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彬长地区位于鄂尔多斯盆地伊陕斜坡、渭北隆起和天环拗陷交接部位。早期研究认为该区主要为三角洲前缘沉积,水下分流河道砂体发育。通过系统分析,认为彬长地区长8期主体处于湖泊坡折带以下,为半深湖-深湖背景下的深水重力流沉积。钻井证实以厚层块状的砂质碎屑流沉积为主,间有浊流沉积。砂体平面展布多呈朵状、席状,砂体剖面为不连续的透镜状。有利储层为砂质碎屑流形成的块状砂岩,其物性、含油性最好。
Binchang area is located in Erdos Basin Yishan slope, Weibei uplift and the Tianhuan depression intersection. Earlier studies suggest that the area is mainly delta front sediment, underwater distributary channel sand body development. Through systematic analysis, it is concluded that the main body of Chang 8 in Binchang area is below the slope break of the lake and is a deep-water gravity flow deposition in the semi-deep lake-deep lake background. Drilling proved to be mainly massive sediment-laden clastic sediments, with turbidite deposition. The sand body is mostly distributed in the shape of a flower-like plane, and the shape of the sand body is discontinuous. The favorable reservoir is massive sandstone formed by sandy debris flow, which has the best physical properties and oil content.