利用波动分析法研究惠民凹陷沙四段和孔店组的地层剥蚀厚度

Research on the denudation thickenss of the fourth member of Shahejie Formation and Kongdian Formation by wave analysis method in Huimin Depression

根据波动分析法原理,结合惠民凹陷地质条件,把惠民凹陷划分为4个地质波动单元,在各单元建立从单井到区域的波动方程,通过寻找不同时期的地层沉积周期波,判断沉积缺失的原因及缺失量。研究结果表明:沙四段和孔店组普遍遭受剥蚀,但地层剥蚀厚度较大的区域主要集中在凹陷边缘靠近隆起区或边界断层附近,而凸起区的剥蚀厚度较小,且孔店组的地层剥蚀厚度明显大于沙四段的,凹陷内部的剥蚀厚度较小,对其内部烃源岩的破坏作用较小,有利于已生成烃类的保存。因此,沙四段上亚段和孔二段烃源岩应成为今后油气勘探的一个重要方向。

According to the wave theory and the geological condition,Huimin Depression was divided into four geologic wave units.Wave equations were established in each unit respectively from single well to whole region.The cause and amount of sedimentary-hiatus were estimated according to the sedimentary periodic waves of different layers in various periods.The research shows that Es4 and Ek were denuded normally;and the regions with more denudation were centralized on the edge of depression and near uplift area or border faults,thus uplift region has little denudation.The denudation thickenss of Ek is clearly larger than that of the Es4,while small denudation thickenss is found within depression where source rocks were destroyed slightly and the gen-erated hydrocarbon could be conserved.Source rocks of upper Es4 and Ek2 are the important directions of oil-gas exploration for the future.