Abstract：In order to identify the palaeogeomorphology and study the relationship between the hydrocarbon accumulation and the palaeo-geomorphology, a new approach for palaeo-geomorphology restoration in the critical period of hydrocarbon generation with double-interface seismic layer leveling is proposed.The approach includes four steps.First, the applicability of seismic layer leveling technology is analyzed, and the seismic layers in the critical period of hydrocarbon generation and the end period of filling-leveling up are determined.Second, in order to eliminate the influence of late tectonic deformation on the palaeo-geomorphology, the seismic layer of the critical period is flattened, then the stratum thickness between the seismic leveling layer and the seismic layer representing the end period of filling-leveling up is calculated.Third, the seismic layer representing the end period of filling-leveling up is flattened in order to restore the palaeo-geomorphology of this period, and the stratum thickness between the two seismic leveling layers is calculated.Finally, by adding up the above the two strata thickness values, the palaeo-geomorphology at the critical period of hydrocarbon generation is described.The proposed approach is applied to restore the pre-Jurassic palaeo-geomorphology in the middle part of Tianhuan Depression, Ordos Basin, and the accuracy of palaeo-geomorphology restoration is improved.At the same time, the Jurassic reservoir-forming regularity in this area is found out, that is, relatively gentle structures of palaeo-geomorphology at the end period of filling-leveling up control the oil migration direction, and the local uplift of palaeo-geomorphology in the critical period of hydrocarbon generation is the favorable part of oil accumulation.This proposed approach may provide a reference in the study of palaeo-geomorphology in similar areas.
刘永涛, 刘池洋, 周义军, 黄雷, 毕明波, 王秀珍. 双界面地震层拉平的古地貌恢复技术及应用——以鄂尔多斯盆地天环坳陷为例[J]. 石油地球物理勘探, 2019, 54(3): 656-666.
LIU Yongtao, LIU Chiyang, ZHOU Yijun, HUANG Lei, BI Mingbo, WANG Xiuzhen. Palaeo-geomorphology restoration with double-interface seismic layer leveling: an example of Tianhuan Depression in Ordos Basin. Oil Geophysical Prospecting, 2019, 54(3): 656-666.
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