基于三维角点网格模型的现今地应力有限元模拟

设计并实现三维角点网格模型的现今地应力有限元模拟方法。利用角点网格, 建立储层三维精细模型。应用网格转换算法, 将网格转换为对应的三维有限元网格模型, 采用有限元法模拟地应力场的分布。采用网格转换逆向方法, 将模型重新采样至对应的角点网格地质模型, 为后续数值模拟等流程提供数据支持, 从而保证流程的连续性和数据的一致性。通过X工区和Y工区两个油田实例数据, 模拟工区应力场分布。对比分析表明, 模拟值与实测值匹配性较好, 证明了方法的准确性和有效性。

Research of Crustal Stress Simulation Using Finite ElementAnalysis Based on Corner Point Grid

The development of stress finite element analysis approach based on 3D corner-point grid can establishaccurate crustal stress field. Firstly, corner-point grid is employed to establish the detailed structure and attributemodel of reservoir. Secondly, grid conversion algorithm is applied to convert corner-point grid to correspondingfinite-element grid. Then, finite element analysis is used to get attribute model based on finite-element grid whichreflects the distribution of crustal stress. Lastly, grid conversion algorithm is operated to reverse the attribute modelto another format which is based on corner-point grid for subsequent analysis. Thus, the procedure continuity anddata consistency has been proved by this approach. Furthermore, real data collected from oilfield X and Y areemployed to simulate stress distribution and the validity and accuracy of the proposed approach can be verified bycomparison between simulation results and real data.