Abstract:

Based on the study of mudstone compaction,1.the erosion and the deposit thickness of the Cretaceous in Shaanxi-Gansu-Ningxia Basin are calculated and the activity for dif-ferent places and different faults in the Cretaceous are contrasted;2.the characteristics of excessive pressure both in vertical and horizontal distribution are discussed according to the fluid pressure calculated;3.the relation between known oil-bearing situation and hy-drodynamic condition were analysed on the basis of excessive pressure distribution and re-ferring to the water salinity and type.