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根据测井、地震和岩心等资料,运用印模法(延9段+延10段+富县组的地层总厚度)对鄂尔多斯盆地子午岭地区侏罗系沉积前的古地貌进行了恢复。研究表明,研究区古地貌形态丰富多样,主要为高地、斜坡、冲沟、梁地和河谷等。在此基础上,分析了侏罗系沉积前古地貌与延10油藏、延9油藏和延8油藏的有利成藏关系,认为油藏主要分布于紧邻高地的斜坡等地势相对较高的地带。古地貌形成的有利成藏条件为下切河谷提供了来自延长组烃源岩生成的油气向上运移通道,斜坡控制着储层砂体的类型和分布规模,以及坡咀、沟间梁和残丘所产生的差异压实形成了后期构造圈闭的相对高点。
According to the data of well logging, earthquake and core, the paleogeomorphology before Jurassic sedimentation in Ziwiling area of Ordos Basin was recovered by means of impression method (total thickness of strata in Yan 9 + Yan 10 + Fuxian Formation). The research shows that the paleogeomorphology of the study area is rich and varied, mainly including highlands, slopes, gullys, valleys and valleys. On this basis, the relationship between paleogeomorphology before deposition of the Jurassic and the favorable reservoirs of the Yan 10, Yan 9 and Yan 8 reservoirs is analyzed. It is considered that the topography of the reservoirs is mainly located in the relatively high terrain such as the slope adjacent to the high land The strip. The favorable reservoir forming conditions for the paleogeomorphology provided the upward migration path for the hydrocarbons from the Yanchang Formation source rock to the undercut valleys. The slope controlled the type and distribution of reservoir sand bodies, The resulting differences in compaction form the relatively high point of late structural traps.