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针对三维油气运聚模拟技术地质模型过于简化所导致的应用效果难于达到实际需求的问题,建立顺层柱状PEBI网格动态三维地质模型,解决不同沉积相内储集层非均质性问题,降低混合岩性对模拟精度的影响。构建基于有限体积法的三维数值模拟技术,包括变网格渗流方程构建、全张量渗透率的分解与计算、传导率的计算等。通过对关键参数曲线的光滑、网格流动上下游稳定性处理等,提高牛顿法迭代收敛性能。采用自动调整时间步长与多核并行计算的技术,提高软件运行效率。模拟计算了渤海湾盆地南堡凹陷油气运聚过程、不同时期地层含油饱和度与油气资源丰度,模拟的含油饱和度、油气聚集量和分布位置符合当前勘探现状,揭示了目标层资源探明率为84.4%,主要资源分布在B区和C区,预测未发现资源主要分布在C区NP2-16井附近和A区NP5-4井北侧的构造上。
Aiming at the problem that the application effect can not reach the actual demand due to over simplification of 3D hydrocarbon migration and accumulation simulation technology, a dynamic three-dimensional geological model of columnar columnar PEBI grid is established to solve the reservoir heterogeneity in different sedimentary facies and to reduce Influence of mixed lithology on simulation accuracy. A three-dimensional numerical simulation technique based on finite volume method was constructed, including construction of variable mesh seepage equation, decomposition and calculation of total tensor permeability and calculation of conductivity. Through the smoothing of the key parameter curve and the stability of the upstream and downstream of the grid flow, the iterative convergence performance of Newton method is improved. Using automatic adjustment of time steps and multi-core parallel computing technology to improve software operating efficiency. The hydrocarbon migration and accumulation process in Nanpu Sag, Bohai Bay Basin was simulated. The oil saturation and hydrocarbon abundance in different periods, oil saturation, hydrocarbon accumulation and distribution are consistent with the current exploration status. The rate is 84.4%. The main resources are distributed in B and C areas. It is predicted that the resources are not found mainly in the vicinity of well NP2-16 in area C and on the north side of well NP5-4 in area A.