松南H凹陷二维盆地模拟试验研究

2-D basin simulation of H depression of Songnan area

为了在松南地区扩大油气勘查成果，我们对勘探重点的H凹陷A剖面进行了二维盆地模拟。得到了H凹陷的地史、热史、生烃史、排烃运移史资料。在地史研究中，从已知盆地出发，采用了回剥技术，由今溯古重建了凹陷的沉积史和构造史。在此基础上进行了热史分析，得到了H凹陷在早期发生断裂活动，并伴有高热流值，形成了有利于有机物向石油烃转化的环境。生烃史和排烃运移史的研究主要对沙河子组地层进行。研究结果表明沙河子组是凹陷中的主要生油气层，营城组次之。油气向超水头值小的方向运移，凹陷中心环带是油气运移的指向地区。这些地区有良好岩相体系和封闭条件的部位是油气聚集的有利场所。

For developing the achivement of exploration in Songnan area, we made a 2D basin simulation at Section A of H Depression which is the most prolific region. Much of the information about geohistory, thermal history, hydrocarbon generation, migration and accumulation history in respect of the H depression is derived. By the backstripping process, the subsidence history and the tectonic history are predicted from inverting observations today in a well explored basin. As a result of the thermal history analyses, we understand that there was a tectonic activity which accompanied by fault and high-heat now from early time in this area, and an environment which promoted to change organic substance into hydrocarbon. The study of the history of hydrocarbon generation and migration is based on the analysis of Shahezi Formation. We concluded that Shahezi Formation was a major source rock and Yincheng Formation was the second in the arca. The direction of oil migration was towards a smaller value of water pressure and the center of enclosed zone in the depression. There were suitable facies and seal condition for oil accumulating.