FINE RESERVOIR DESCRIPTION OF COMPLEX FAULT-BLOCK OIL FIELD

The fine reservoir descriptions of several complex fault-block oil fields in Shengli petroliferous area have been practiced. In the middle-late stage of the oil fields development, the production decline successively with high water cut. Using modern reser- voir description techniques, a series of studies for fault-block oilfields has been carried out based on the geologic characteristics of complex fault-block oil fields in order to enhance the oil recovery and to scout the potential of residual oil. The studies include the detailed correlation and zonation of reservoir units. classification of natural fault blocks, micro-structures, sedimentary mi- crofacies analysis related to stratigraphic unit and fault block classification, reservoir heterogeneity, closed unit of reservoirs space, fine reservoir type, fluid model, reserve recalculation, reservoir geologic model and their related techniques. The tech- nique route of the detailed reservoir description in complex fault-block oil fields has also been summarized. Such key concepts as natural fault block, closed unit of reservoir space, fine reservoir type have been put forward and their significance has been clari- fied from theory to practice.