【摘要】 普光气田飞仙关组滩相大气田的发现,展示了碳酸盐岩滩控型储层巨大的勘探潜力,然而后续的开发井钻探表明,传统沉积相研究提出的成带分布的台缘滩并不稳定,因此,研究鲕滩发育分布规律尤为必要。以四川盆地普光气田下三叠统飞仙关组为研究对象,通过对颗粒岩测井识别模型、滩体的环境微相及其分布主控因素分析,深入探索了普光气田飞仙关组鲕滩的发育分布规律。依据颗粒岩与地层厚度之比把台缘滩划分为滩核、滩缘及滩间微相,从而给碳酸盐岩微相赋予更多的环境和储集意义。普光气田飞仙关组发育台缘鲕滩和台内鲕滩2种滩体。鲕滩分布受控于沉积期地貌变化,总体上沿台地边缘呈带状分布,但其内部存在的次一级微地貌变化导致了滩体横向分布的变化,进而导致了滩相储层严重的横向非均质性。更多还原

【Abstract】 The discovery of the oolitic beach gasfield of Feixianguan formation in Puguang shows the huge exploration potential capacity of the beach-controlled carbonate rock reservoir.However,the sequent drilling of the development wells indicates that the zonational distribution of the platform edge banks raised by traditional sedimentary facies study is not steady.Therefore,the research of oolitic beach development and distribution is particularly necessary. Aiming at the Lower Triassic Feixianguan formation of Puguang gas pools in Sichuan Basin,log identifying model of granular rocks,the microfacies of the banks and the major controlling factors were analyzed,and the distribution of the oolitic beach in Feixianguan formation was researched thoroughly.The granular rock/formation thickness method was applied to classify the platform edge beach as bank core,bank margin and interbank microfacies, and this gives the carbonate micro-facies more environmental and reservoir significance.Platform edge oolitic beach and inner-platform oolitic beach were developed in Feixianguan formation in Puguang Gasfield.Microtopographic alteration during the depositional stage controlled the development and belt-distribution of oolitic beach.Serious horizontal heterogeneity of the beach reservoirs results from the horizontal distribution change of the beach.For the purpose of improving the success ratio of gasfield, detailed research should be made on the development and distribution of the oolitic beach in Feixianguan formation of Puguang Gasfield.更多还原