A Study Of Donghan Oil Field Reservoir Evaluation

Upper Triassic YanChang of Ordos Basin is the most important oil-bearing stratain the basin, DongHan oil field head of reservoir mainly to the low permeability, lowpermeability reservoirs.It is mainly belong to lithologic reservoirs with weak tectonicactivity. In general, the efficiency of oil field development is low.In order to findfavorable reservoir to achieve the integration of exploration and development, providea theoretical basis for the efficient and rational development of the ReservoirDongHan oil field. It is necessary to proceed comprehensive evaluation of DongHanoil field Reservoir.Through applicating modern reservoir characterization theory and methods, focusfrom the stratigraphic division and contrast, construct the distribution characteristics,sedimentary microfacies and sand body distribution characteristics, the reservoir rockcharacteristics, reservoir heterogeneity characteristics, the pore throat types andphysical features proceeding in-depth and systematic research.It was imported that the reservoir construction of DongHan oil field is thewest-dipping monocline of east to the west as a whole, the structure frameworkpresent nose uplift west distribution pattern, the study area mainly developed deltaplain facies. By drawing a contour map, analyze the Chang two reservoir sedimentarymicrofacies sand body distribution characteristics. count and analyze the Cast thinsection microscopy, the reservoir lithology of DongHan oil field is Order to arkose themain, pore type is mainly intergranular pores, the clay mineral is mainly kaolinite andchlorite; The layer and flat heterogeneity of the reservoir is powerful.By Screening and using parameters that can fully reflect the reservoircharacteristics as a variable, combinating statistical methods of comprehensivereservoir evaluation index and fuzzy clustering analysis, accurate and comprehensiveevaluate each layer of the Chang two Reservoir.