海拉尔盆地乌尔逊凹陷南部地区构造和断裂复杂,多物源,短物源,相变快,因而导致下白里统南屯组岩性有利目标区预测难度大.根据层序地层学和坡折带理论,以地震资料为基础,建立了一套新的地震精细解释、复杂勘探目标区岩性体识别及三维可视化刻画等全三维地震解释技术体系.认为乌东斜坡发育三个坡折带,第三坡折带下倾方向和第二坡折带具备形成岩性油气藏的地质条件,应用频谱分析和三维可视化技术在乌东斜坡带南屯组识别有利扇体10个,面积145 km2,部署探井5口,其中4口获工业性油流,1口获低产工业性油流,探井符合率100,.

It is a complex area in the southern part of Orxon Depression, Hailar Basin, because of complicated faults and structures, multisource, short sediment source and fast facies change of Lower Cretaceous Nantun Formation, all of which lead to difficult prediction to the favorable target area. Aiming to the problem, and guided by the sequence stratigraphy and "slope break" theory, a serial of innovative techniques including the 3-D seismic fine interpretation, the sandstone description and the 3-D visualization interpretation for complicated target areas is established for this study. By using these new techniques, three slope break belts are found in Eastern Orxon Slope. It is regarded that the downdip part of the third slope break belt and the second slope break belt are favourable to form lithologic hydrocarbon reservoirs. 10 good Nantun Formation fan bodies with a total area of 145km2 are distinguished out in the third slop and 5 wells were drilled, in which 4 wells of commercial oil flow and 1 well of low-yielded oil flow are obtained. The rate of well coincidence is 100,.