Abstract: Aiming at the geologic characteristic of bottom water reservoir with gas cap,the geologic moddelling software is used to set up structural model and reservoir model,and illustrate the structure and reservoir characteristics of the bottom water reservoir with gas cap,by depicting physical property explanation plots of oil reservoirs,aquifers and gas formations,the geostatistic method is applied to precisely calculate the parameters of reservoir heterogeneity and describe the heterogeneitic characteristic of the faulted block reservoir,in view of the consequence,VIP numerical simulation software is employed to describe the distribution feature of remaining oil,also,the distribution feature of remaining oil of bottom water reservoir with gas cap and the influence of gas cap and bottom water on remaining oil are discussed in this paper,it is recognized that the remaining oil is mainly concentrated in the locally incomplete areas of injection and production system,the elastic areas without water injection and the reserve loss areas not controlled by oil and water producers,the remaining gas is mainly distributed in the north areas and the top sand formations.Based on the acquisition,adjusting scheme is put forward and good result is achieved after implementation,on the average,oil and gas yield increases by 2.3×10⁴ t and 0.2×10⁸ m³ respectively,comprehensive decline slows down by 2.1%,oil and gas are produced with high efficiency in the same time.

Key words: reservoir description, numerical simulation, remaining oil, bottom water reservoir with gas cap, Weicheng Oilfiled