早白垩世合肥盆地性质及含油气性分析

根据地震、电法、盆地模拟等新资料并结合区域地质资料的综合分析,对早白垩世合肥盆地的复杂构造及盆地性质、演化进行了深入讨论,认为合肥盆地在早白垩世时属于一个处于由压性应力场向张性应力场转换过程中形成的复杂复合盆地,即早白垩世早中期属主要受控于其南侧大别造山带的滑覆冲断类前陆盆地、早白垩世中晚期属主要受控于其东侧郯庐断裂活动的走滑拉分盆地。进而探讨了其拉分盆地内潜在的下白垩统油气系统及其勘探前景。从盆地研究的角度来进一步认识郯庐断裂的活动及对合肥盆地的油气勘探均具有借鉴及指导意义。

NATURE OF THE HEFEI BASIN IN EARLY CRETACEOUS AND ANALYSIS OF ITS PETROLEUM POTENTIAL

New data including seismic data, MT data and the basin simulation data as well as the regional geologic data indicate that Hefei Basin in Early Cretaceous was a composite basin. This basin was formed after the similar forland basin in the Jurassic and before the fault basin in the Late Cretaceous Early Tertiary, so it was complicated in the transitional stress field from the compression to the strike slip. It can be divided into two parts, one is the sliding thrust similar foreland basin which was controlled by the Dabie Orogenic Belt in the early middle period of Early Cretaceous, the other is the pull apart basin which was mainly controlled by the Tan Lu Fault Zone in the middle late period of Early Cretaceous. In the pull apart basin, there exists a potential Lower Cretaceous petroleum system. For lack of certain traps, so there is a risk for exploration. It is instructive to realize the movement of the Tan Lu Fault System and its influence on the Hefei Basin from the view point of basin research.