多相达西流法是油气二次运移模拟技术中最复杂的方法,存在三大技术难点:①模型十分复杂,求解比油藏模拟的难度大得多;②收敛性、稳定性不易保证,导致计算结果精度低、计算中途异常停止;③计算机耗时量巨大,在微机上算完一个大型盆地要花几天时间。为此,采用了基于PEBI(直交平分)网的有限体积法、基于牛顿迭代的全隐式法及ORTH-MIN(正交极小化)法,摸索出了“正确地选取一个模拟工区的最大允许时间步长”是解决上述三大技术难点的最大关键点,从而攻克了这三大技术难点。研发了三维三相达西流软件,并应用于库车坳陷,获得了较好的油气运聚史模拟结果。 The multiphase Darcy flow method is the most complicated method in the simulation of secondary migration of oil and gas. There are three technical difficulties: ① The model is very complicated and it is much more difficult to solve than the reservoir simulation; ② Convergence and stability are not easily guaranteed , Resulting in low accuracy of the calculation results in the calculation of an abnormal stop; ③ huge computer time-consuming, finished in the computer a large basin to spend a few days time. For this reason, the finite volume method based on PEBI (direct bisecting) network, the all implicit method based on Newton’s iteration and the ORTH-MIN (orthogonal minimum) method were used to find out that “correctly select a simulation work area The maximum allowable time step ”is the biggest key to solve the above three technical difficulties, thus capturing the three technical difficulties. Developed three-dimensional three-phase Darcy flow software, and applied to the Kuche depression, obtained better hydrocarbon accumulation history simulation results.