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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。
In view of the problems encountered in oil and gas exploration in the Northern Jiangsu Basin, this paper puts forward the author’s viewpoints on the deviations caused by the establishment of geological models from the aspects of structure, sedimentation and geochemistry. The same direction relationship between the Moho and the basin makes the geothermal gradient of the Northern Jiangsu Basin smaller than that of other basins in the eastern part. The lake-level influence will produce different sedimentary-tectonic modes on both sides of the synsedimentary fault. Sediments produced by the muddy sedimentary parent rock Characteristics and reservoir properties are different from the general laws. Comparing immature oil-source rocks with the conventional oil source contrast method can not reflect the objective reality. Therefore, to establish the geological model according to the objective reality in this area, to avoid the simple application of the general mode of deviation.