Research On Remaining Oil Distribution Of The Third Member Of Shahejie Formation Of Shen84-An12 Block

Shen84-An12 block is the main body of Jinganbao structural belt, situated in the middle of the structural belt. The main formation of interest for development in this block is the third member of Shahejie formation, and the thickness of sedimentary formation is large, the distribution is vast. After more than 20 years′development, oilfield is facing a prominent intrabed contradiction between mixed water injection and commingled production of multilayers wide-section, with low employing grade, bad injection-production correspondence ratio, low waterflooding control grade, high composite water ratio, low oil production, stray remaining oil distribution, serious main layer flooding, and big adjustment difficulty.Inferring the basic theory and means of Structural Geology, Sedimentology, High Resolution Sequence Stratigraphy, Reservoir Geology, Reservoir Engineering and in view of the structural feature, sedimentary feature, reservoir feature of the third member of Shahejie formation of faulted anticline hydrocarbon bearing structural trap of Shen84-An12 block, this text confirms this block is fan-delta depositional and growing microfacies is little, mainly braided bridging channel, interfluvial lice and interfluvial mud. And sand distribution direction is NE-SW. Reservoir, mainly low-to-moderate permeable bed, has a large change physical property. Porosity and permeability declines obvious along with adding depth in the longitudinal direction. In plane direction, porosity, permeability, shale content and oil saturation is controlled by sedimentary facies belts. The physical property of braided bridging channel is betrer than interfluvial lice. And reservoir permeability has something to do with facies. Reservior plane inhomogeneity is powerful.Based on geologic research, combinating development feature, and using norm function and coring data, the text studies the macro and micro distribution features of remaining oil, gains the distribution rules and proposes the potential tapping direction and measures of remaining oil.