摘要
本文针对苏北盆地油气勘探实践中所遇到的问题,从构造、沉积、地球化学等方面,就建立地质模型所产生的偏差提出了笔者的观点。莫霍面与盆地的同向关系使苏北盆地的地温梯度小于东部其它盆地;湖平面的影响会产生同沉积断层两侧的不同沉积—构造模式;富含泥质的沉积母岩产生的沉积特征以及储集层性质,有别于一般规律;用常规的油源对比方法进行未成熟生油岩的对比,不能反映客观实际。因此,建立地质模型要根据本区的客观实际,避免因简单套用一般模式所产生的偏差。
According to the problems in the petroleum exploration in the Subei Basin, this paper proposed the author's own viewpoint about the deviation produced by the geological model from tectonic, depositional, geochemical and other aspects. The accordance of the basin with Moho surface made the geothermal gradient of the basin is lower than that of the other basins in the east part. The influence of the lake level will cause the different depositional-structural styles in the both sides of the syndepositional fault. The depositional characteristics and reservoir properties formed by the mud-rich depositional source rocks is different from the common regularities. So, it is no objective that to use the conventional methods to correlate the immature oil source rocks. Therefore, the geological model must be established in accordance with the actual situations of the study area, avoiding the deviation formed by applying mechanically and simply the ordinary model.
关键词
盆地
地质模型
油气勘探
建模
Subei Basin, geological model, petroleum exploration
