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通过岩心、薄片和压汞等资料的综合分析,划分并研究了伊拉克西古尔纳油田白垩系Mishrif组孔隙型碳酸盐岩储集层类型及特征,并从层序地层、沉积相和成岩作用角度分析了储层的主控因素和分布特点。研究结果表明:研究区储集层可以划分为高孔高渗型、高孔中渗型、高孔低渗型、中孔低渗型和低孔低渗型5种类型。由高孔高渗型到低孔低渗型储层中值压力和排驱压力依次升高,物性逐渐变差。储层类型受到层序地层、沉积相和成岩作用的控制。海侵体系域和早期高位体系域以低渗储层为主,最大海泛面时期发育低孔低渗型储层,晚期高位体系域发育高孔高渗型储层;开阔陆棚相多发育高孔低渗型储层,台地前缘斜坡相和开阔台地相发育中孔低渗型储层,台地边缘礁滩相能量高,发育高孔高渗型储层,局限台地相发育低孔低渗型储层;溶蚀作用对储层物性影响最大,从高孔高渗型储层到低孔低渗型储层,溶蚀作用逐渐减弱,孔渗性逐渐变差。
Based on the comprehensive analysis of core, flake and mercury intrusion, the types and characteristics of pore carbonate reservoir in the Cretaceous Mishrif Formation in the West Gulna Oilfield of Iraq were studied and studied. The main controlling factors and distribution characteristics of the reservoir are analyzed from the perspective of function. The results show that the reservoirs in the study area can be divided into five types: high porosity and high permeability, high porosity, high porosity and low permeability, low porosity and low porosity. From high porosity and permeability type to low porosity and low permeability reservoirs, the median pressure and displacement pressure increase in turn, the physical properties gradually deteriorate. The reservoir type is controlled by sequence stratigraphy, sedimentary facies and diagenesis. The transgressive system tract and the early highstand system tract are characterized by low permeability reservoirs, low porosity and low permeability reservoirs in the maximum sea surface period and high porosity and permeability reservoirs in the late highstand system tract. The open continental shelf facies High porosity and low permeability reservoirs, the platform front slope facies and the open platform facies development of low permeability reservoirs with medium porosity and low permeability, the high reef facies facies of the platform edge are high, high porosity and permeability reservoirs are developed, Permeability reservoir; The dissolution has the greatest influence on reservoir properties. From high porosity and permeability reservoir to low porosity and permeability reservoir, the dissolution gradually weakened and the porosity and permeability gradually became worse.