埕北断阶带沙二、三段油藏的构造差异性研究

Structure difference analysis of oil reservoirs in the second and third members of Shahejie Formation in the Chengbei fault terrace zone of Qikou Sag,Bohai bay Basin

应用埕北断阶带中、低断阶钻井地质及三维地震资料,分析埕北断阶带构造差异性。埕北断阶带沙二、三段油藏于北东向断裂系以东断块、断鼻区呈集中分布,主要受控于沙一沉积期北东向断裂活动与断块翘倾和部分北东向断裂的继承性发育。在低断阶及中断阶开展油藏构造差异性分析,为该区油藏开发指明方向,对埕北低断阶的储量评价具有指导意义。

The study carried out the integrated analysis on structure difference of the Chengbei fault terrace using drilling geological and 3-D seismic data. The results show that oil reservoirs of the second and third members of the Shahejie Formation occur mainly in the eastern fault terrace of the NW-trending fault, mainly concentrating in the Duanbi area and being controlled by the fault activities and successive development of some NE-trending faults during the sedimentation stage of the first member of Shahejie Formation. The study of structure difference of the middle and low fault terrace zone will provide a guideline for future exploration of oil reservoirs and be of some significance for the evaluation of oil reserves in the low Chengbei fault terrace zone.