Based on the Sedimentary Facies of the Low Porosity and Permeability Reservoir Water Flooded Layer Qualitative Interpretation Method

Abstract

Yushulin oilfield Fuyang reservoir belongs to typical low porosity and permeability reservoirs. The internal sand body has complex pore structure and serious heterogeneity. The well logging response doesn't change significantly after the reservoir is flooded. In order to improve the identification precision of the water flooded layer, this paper divides the reservoir into the thick reservoir which is mainly to fluvial facies and estuarine dam deposition and the thin and poor reservoir which is mainly to sheet sand and far sand dam two class. The qualitative identification chart of water flooded layer was established. The chart coincidence rate is more than 75 %, providing a strong basis for perforation scheme of infill wells. The research method of the peripheral oilfield flooded layer identification has wide applicability.