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通过对靖边气田榆31井区马五1-4储层沉积作用、成岩作用、小幅度构造和岩溶古地貌特征的研究,认为沉积微相中的潮上带膏质云坪最有利于储层发育,其次是潮间潮上带含膏云坪。对孔隙起建设性的成岩作用主要是近地表和埋藏期白云石化作用、表生岩溶作用和埋藏溶解作用。构造高部位储层物性较好,有利于天然气的聚集。岩溶残丘、岩溶台地是储层发育的有利区域。
By studying the sedimentation, diagenesis, small amplitude tectonics and paleogeomorphology of the Ma5-1u reservoir in the Yu-31 well in the Jingbian gas field, it is concluded that the tidal-patchy Yunping in the sedimentary microfacies is the most favorable for reservoirs Layer development, followed by tidal wave with cream Yunping. The diagenetic constructive diagenesis mainly consists of dolomitization near surface and burial period, supergene karstification and burial dissolution. The structure of the high-level reservoir has good physical properties and is conducive to the accumulation of natural gas. Karst residual mound, karst platform is a favorable area for reservoir development.