三维现今地应力场有限元数值计算

The FEA Numerical Algorithm for 3D Modern Crustal Stress Field

研究现今地应力场的分布规律对油气藏的勘探、开发有重要的指导意义。依据Petrel地质模型网格节点数据,建立有限元三维精细几何模型,并对岩体和断层进行不同尺寸的网格剖分。综合利用地球物理测井与岩芯资料,采用VB.net编程求得三维岩石力学参数,根据单元中心坐标分别赋予相应的参数。运用大型有限元软件ANSYS建立了塔里木盆地##2地区三维有限元模型,以测井应力解释剖面为井点应力约束条件,经过多次反演试算得到模型的合理边界条件。与现场资料数据比较发现:数值模拟结果吻合性较好。可为三维现今地应力场的模拟提供数值计算方法。

The study on modern Crustal stress field distribution is with guiding significance to prospect and exploit oil and gas reservoirs.3Drefined finite element model is established in terms of Petrel geology model grid point data,rock and faults are meshed in different sizes grid.Comprehensively utilizing geophysical well logging information and Core data,3Drock mechanical parameters are assigned to unit according to center coordinates,are programmed by VB.NET program.3D modern of Tarim basin ##2is established by large ANSYS software to test that the well stress interpretation profile is well point stress constraint condition,and boundary conditions are got after several inversion test.The result is full of much accuracy by comprising with spot materials data.This paper can provide a numerical algorithm for 3Dmodern crustal stress field.