靖边气田榆31井区马五_(1-4)储层控制因素研究

Control Factors of Mawu_(1-4) Reservoir in Yu31 Block, Jingbian Gasfield

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。

On the research of Yu31 Block in Jingbian Gasfield,the control factors of Mawu 1-4 reservoir include sedimentation,diagenesis,low amplitude structure and paleogeomorphy.The research shows that the gypsum mod and gypsum concretion on the supratidal zone is the best micro sediment facies,then the gypsum concretion on the upper part of intertidal zone.The constructive diagenesis is the dolomitization,supergene karst and buried karst action.The reservoir properties is better in the high position of tectonic,and is beneficial to the gathering of natural gas.The physical property of contain rock in the clinoform,tableland and around the ravine will be the favorable areas of karst reservoir development.