Abstract: The rational gridding of complicated cross faults is the key of geologic modeling and simulation of complex fault block reservoirs and irregular-boundary reservoirs. In previous modeling software the faults are processed as staircase along the grid, while the boundary of an irregular reservoir is dealt with by deformed angular point grid, which decrease the accuracy of the model to a certain extent. By using SURE software developed by HOT company, this paper conducts the geologic modeling and numerical simulation for partial fault blocks in Tuha oil field, and more rationally deals with the complicated cross faults, realizing reasonable distribution of the grid block parameter around faults in the 3D geological model, and increasing the accuracy of fault block reservoir simulation.

Key words: Tuha basin, fault block reservoir, perpendicular bisection grid technique, geologic modeling, reservoir simulation