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为研究鄂尔多斯盆地前侏罗纪古地貌对其上下覆油藏控制作用,运用印模法,通过统计延10+富县组地层厚度对研究区前侏罗纪古地貌进行恢复。研究表明:前侏罗纪古地貌形态对其上、下覆地层的构造、储层、运移通道及油气富集规律都有重要影响。侵蚀斜坡和侵蚀高地及构造高点对下覆长2油藏有较好的控制作用;而侵蚀沟谷区发育的河道砂体则为上覆延9油藏提供了良好的运移和储集条件。
In order to study the effect of paleogeomorphology on the upper and lower overlying reservoirs in the Ordos Basin, the pre-Jurassic paleogeomorphology was restored by statistic method through the thickness of the strata in the late Fuxian Formation. The study shows that the paleogeomorphology of the Pre-Jurassic period has an important influence on the structure of the upper and lower overburden, reservoirs, migration channels and the law of oil and gas accumulation. Eroded slopes and eroded highlands and tectonic highs have good control over Lower Chang 2 reservoirs, while channel sand bodies developed in eroded gully regions provide favorable migration and accumulation conditions for the upper extension of Yan 9 reservoirs .