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鄂尔多斯盆地北部奥陶系内部构造不发育,区域地震剖面以平行反射结构为主要特点。经对代表上马家沟组顶底界的T_9、T_(10)相位及其之间次一级相位进行分析,可在盆地北部划分出3个地震相区和11种地震相类型。不同的地震相类型代表了不同沉积相带或不同岩性组合在地震剖面上的反射结构特征,通过对已钻区地震相类型的划分,就可以探讨未知区的沉积层序和沉积相的演变,并为优选勘探区块提供依据。根据盆地北部上马家沟组储集岩主要发育在白云岩中的区域特点,确定出B、D、E、F、I、J等6种地震相类型为有利的白云岩发育区,这也是天然气勘探的有利区带。
Ordovician Basin northern Ordovician interior structure is undeveloped, the regional seismic profile parallel reflection structure as the main feature. By analyzing the phases T_9 and T_ (10) on the top and bottom boundaries of the Upper Majiagou Formation and the secondary phases between them, three types of seismic facies and 11 types of seismic facies can be divided in the northern part of the basin. Different types of seismic facies represent the reflection structural features of different sedimentary facies belts or different lithologic assemblages on the seismic profiles. By dividing the seismic facies types of the drilled areas, we can discuss the evolution of sedimentary sequence and sedimentary facies in the unknown area , And provide the basis for optimizing the exploration area. According to the regional characteristics of the Shangjiagou Formation reservoir rocks mainly developed in the dolomites, six kinds of dolomite development zones of favorable facies types such as B, D, E, F, I and J are determined, which is also the natural gas Prospective exploration zone.