Karstification controls the karst reservoir development characteristics of Ordovician Ma 54 sub member of the western Jingbian buried platform in Ordos Basin .In this paper based on core ob-servation ,combined with thin section and SEM analysis data ,the western Jingbian buried platform of Ordovician Ma54 sub member in Ordos Basin is divided into anhydrite-nodules bearing mold micrite-microcrystalline (algae ) dolomite and other 12 kinds of rock types and gyp-sum mould pore and other 4 kinds of reservoir space .The Precarboniferous paleogeomorphic of study area was restored by the method of impression ,and then divided into 3 types of karst highland ,karst inclining and karst basin karst paleogeo-morphic unit .It is recognized that the karst base level and anhydrite content jointly control the karstification intensity ,a-mong them ,karst inclining has the strongest karstification ,followed by karst highland ,and karst basin is the weakest ,its reservoir distribution is mainly controlled by sedimentary facies belts ,paleogeomorphic characteristics and karstification .%岩溶作用控制着鄂尔多斯盆地靖边潜台西侧奥陶系马家沟组马五4亚段岩溶储层发育特征.通过大量岩心观察,结合薄片、扫描电镜等分析资料,将鄂尔多斯盆地靖边潜台西侧奥陶系马家沟组马五4亚段分为含硬石膏结核铸模泥—泥微晶(藻)白云岩等12种岩石类型及膏模孔等4种储集空间类型;并采用印模法对研究区前石炭系古地貌进行恢复,将其划分为岩溶高地、岩溶斜坡以及岩溶盆地三个二级岩溶古地貌单元,并认为岩溶基准面和硬石膏含量共同控制着岩溶作用强度,其中岩溶斜坡的岩溶最强,岩溶高地次之,岩溶盆地最弱,其储层展布主要受沉积相带、古地貌特征、岩溶等成岩作用的共同控制.
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