塔河油田缝-洞型碳酸盐岩油藏等效数值模拟

The Equivalent Numerical Simulation of Fracture-Vuggy Carbonate Reservoir in Tahe Oilfield

塔河油田奥陶系碳酸盐岩油藏埋藏深,储集空间多样,储集类型复杂,油藏模拟和动态预测难度大,其原因主要是现有的油藏数值模拟器很难模拟裂缝-溶洞型双重介质系统。应用渗流力学基本理论,建立了裂缝-溶洞型双重介质的数学模型,提出了裂缝-溶洞型双重介质与裂缝-基质型双重介质等效的数学表达式,为更好地应用现有的数值模拟软件来模拟塔河缝-洞型油藏提供了依据。应用此方法,对塔河油田奥陶系碳酸盐岩的一口油井进行了模拟,结果证实了该方法的有效性。

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 fraeture-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.