【摘要】 通过对鄂尔多斯盆地镇北地区长3油藏储油砂体成因和成藏有利条件的分析,指出长3油层组的储油砂体主要有水下分流河道、河口坝以及河道与坝复合3类8种砂体;前缘沉积的储油砂体下伏深水泥岩、单斜背景上发育的鼻隆构造、局部地区缺失长3顶部的地层和周缘上覆的泥岩盖层等是本区有利的成藏条件;油藏以岩性控制为主、构造控制为辅,类型有2种即砂岩上倾尖灭型和透镜体型油藏,其中,透镜体油藏又分为3种,即鼻隆构造高部位砂岩透镜体、鼻隆侧翼砂岩透镜体和小幅向斜砂岩透镜体油藏。更多还原

【Abstract】 Based on the analyses of geneses of reservoir sandstone and the favorable conditions of reservoir of Chang-3 oil formation,the genetic type of the reservoir sandbodies in this area can be divided into underwater distributary channel,combination of underwater distributary channel and mouth bars,mouth bars sandbodies.There are main four favorable conditions of reservior,they are oil-bearing sandbody underlying deepwater mudstone,nose-uplift on the background of monoclinal structure,top stratigraphic of chang-3 incompletement and overlying mudstone.The reservior in this area is main controlled by lithology,and structure secondary.Sandstone updip pinch out reservior and sandstone lens reservoir are main types.更多还原