论文部分内容阅读
采用有限体积法实现了点源二维地电断面地-井、井-地激发极化法数值模拟。从电位满足的边值问题出发,推导出有限体积各控制容积所满足的离散方程式,利用预处理迭代算法对大型稀疏线性方程组进行求解,尔后,通过对比两层大地模型的数值解与解析解验证了所编制程序的正确性,最后采用两种常规观测装置进行视电阻率/视极化率的正演,计算结果表明,联合井-地、地-井装置的激发极化测井对异常体的探测是有效的,视极化率的异常幅度较视电阻率大,并且异常体的垂向分辨率优于水平方向的分辨率。
Using finite volume method, the numerical simulation of ground-well and well-ground induced polarization of point source two-dimensional geoelectric section was realized. Based on the boundary value problem that the potential is satisfied, the discrete equations satisfied by the control volume of the finite volume are deduced. The large-scale sparse linear equations are solved by the iterative algorithm of preprocessing. Then, by comparing the numerical and analytical solutions of the two- The correctness of the program was verified. Finally, two kinds of conventional observation devices were used to conduct the forward modeling of apparent resistivity / apparent polarizability. The calculated results show that the excitation polarization logging of the combined well-ground and ground-well device is abnormal Body detection is effective, depending on the rate of polarization anomalies greater apparent resistivity, and the abnormal body’s vertical resolution is superior to the horizontal resolution.