Abstract: The Ordovician carbonate reservoir in Tahe oilfield is characterized by deep buried depth, multiple storage spaces, complex reservoir type, which lead to difficult reservoir simulation and performance prediction for the existing simulators are hard to simulate the dual porosity reservoirs. This paper develops the mathematical model for fracture-vuggy reservoir and proposes the expression or formula that fracture-vuggy media system is equivalent with fracture-matrix media system by using percolation dynamics theory, in order to better use existing simulators of such kinds of reservoirs. This method is effectively applied to simulate an oil well penetrating the Ordovician carbonate reservoir in Tahe oilfield.

Key words: Tahe oilfield, carbonate reservoir, numerical simulation, method