Abstract: A same reservoir may be repeatedly drilled in a vertical well in complex reverse fault-block reservoirs, making the geological modeling of these reservoirs one of the most troublesome modeling activities. Conventional reservoir geological modeling is incapable of characterizing the superimposed structures and reservoirs in reverse fault-block reservoirs, which will lead to an imprecise and unreliable reservoir geological model with distortion and reserve loss. Actual reservoir cannot be characterized by upscaled model due to formation and reserve losses. Accordingly, a series of technologies are developed to solve this technical problem, which principally include multiboundary technology, fault-isolation technology, rectangular corner-point grid system with full coverage of superimposed reservoir area and other reservoir numerical simulation upscaling technologies. An efficient solution is established to complete structure modeling and numerical simulation upscaling and other problems in the geological modeling of complex reverse fault-block reservoirs. Seismic structure interpretation, sedimentary facies, strata correlation, well and other data are comprehensively used in this solution to establish an precision Yingdong-1 reservoir geological model and the performance forecast model that is used to perform reservoir numerical simulation. Practical applications indicate that the matching rate between forecast production and 2-year actual production exceeds 95%.

Key words: reverse fault-block, reservoir geological modeling, multi-boundary technology, fault-isolation technology, reservoir numerical simulation