基于MPFA的油水运移层面问题数值模拟研究

发布时间：2018-07-03 02:03

本文选题：二次运移 + 角点网格　；参考：《山东大学》2015年硕士论文

【摘要】：油气二次运移是指继初次运移之后,油气通过高渗高孔运载层内的运移和沿断层、裂缝、通道和不整合面的运移,若遇到合适的油藏构造,油气聚集就形成油藏,其最大运移距离可达数十千米。油气是如何运移聚集到现今的圈闭中的,在盆地中又是怎样分布的,这些都是油气二次运移聚集过程中数值模拟所要研究的重要内容。在本文中,我们研究油水两相模型。该模型是耦合的非线性偏微分方程组,模拟范围达数十平方公里,模拟时间长达数百万年。采用角点网格进行区域剖分,使用多点通量逼近技术(MPFA)和O-方法计算传导率系数矩阵,构造了联立求解的离散数值格式,对离散代数系统采用了广义最小残量方法(GMRES)迭代方法求解。通过数值模拟,验证了方法的有效性,模拟结果符合油水运移聚集的规律。
[Abstract]:Secondary migration of oil and gas refers to the migration of oil and gas through high permeability and high porosity transport layers after the initial migration, and along faults, fractures, channels and unconformity surfaces. If a suitable reservoir structure is encountered, the accumulation of oil and gas forms a reservoir. Its maximum transport distance can reach tens of kilometers. How oil and gas migrate and accumulate into the present traps and how they are distributed in basins are the important contents of numerical simulation in the process of secondary migration and accumulation of oil and gas. In this paper, we study the oil-water two-phase model. The model is a coupled nonlinear partial differential equation with a simulation range of tens of square kilometers and a simulation time of millions of years. The corner mesh is used to divide the region, the multipoint flux approximation (MPFA) and the O- method are used to calculate the conductivity coefficient matrix, and a discrete numerical scheme for simultaneous solution is constructed. The generalized minimum residue method (GMRES) iterative method is used to solve discrete algebraic systems. The validity of the method is verified by numerical simulation, and the simulation results accord with the law of oil and water migration and accumulation.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【共引文献】