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前人运用不同的方法对苏北盆地三剁事件剥蚀量进行过计算,但主要集中在某一凹陷或某一方面,缺少从整个盆地大的成因环境中分析和考虑,其所得的结果具有片面性。在评价前人计算方法的基础上,通过综合运用泥岩声波时差法、地层厚度趋势外推法,对三垛事件剥蚀厚度进行了恢复。结果表明,苏北盆地该事件中的最大剥蚀量在1000～1200m之间,主要位于建湖隆起区;深凹处剥蚀量最少,一般在300～500m左右;斜坡和低凸起的剥蚀量一般在600～900m左右;盆地南部的剥蚀量较北部来说相对较少。这对重新认识苏北盆地的油气成藏史以及油气藏分布规律具有重要意义。
The predecessors used different methods to calculate the erosion amount of three chop events in the Northern Jiangsu Basin. However, they mainly concentrated in a depression or a certain aspect, lacking analysis and consideration from the genesis environment of the entire basin, and the results obtained are of one-sidedness . Based on the evaluation of the predecessors’ calculation methods, the eroded thickness of the three-stack event was restored by comprehensively using the time-difference method of mudstone acoustic wave and the trend extrapolation of formation thickness. The results show that the maximum denudation in this event is between 1000 and 1200 m in the North Jiangsu Basin, and is mainly located in the Jianhu Uplift. The denuded depth is the least in the deep pits, generally about 300-500 m. The denuded volume of the slopes and low protuberances is generally About 600 ~ 900m; erosion in the southern part of the basin is relatively less than that in the north. This is of great significance to re-understand the history of oil and gas accumulation in the Northern Jiangsu Basin and the distribution of oil and gas reservoirs.