摘要
利用改进后的广义逆矩阵法,对电偶源频率电磁测深中所定义的三种单分量视电阻率曲线和两种比值视电阻率曲线,进行反演试验研究,获得了较好的效果,为了研制出一套实用的微机反演程序,我们着重研讨了在满足实际反演精度要求和保证反演迭代收敛的条件下,其正、反演计算中某些近似计算方法的可适用性。对于频率电磁测深视电阻率曲线的高频端,正演计算可采取远场近似;计算雅可比矩阵可采取插值法;且正演中滤波系数项数亦可进行较大幅度的削减,这样可提高反演迭代速度6～10倍,形成了一套实用效果较好的程序。
Here the inversion of the apparent resistivity curves of three electromagnetic field components and two ratio apparent resistivity curves, which are defined in frequency electromagnetic sounding, is tested and studied by modified generalized inverse matrix, and better effects are obtained. For designing a set of applicable inverse programs we lay special stress on studying the suitability of some approximate calculations in the forward and inversion calculations when the inversion accuracy is sufficient and the convergence of the inversion iteration is ensured. The high frequency parts of the apparent resistivity curves can be calculated by the far field approximation; the partial differential matrix can be calculated by the interpolation; the numbers of the filter coefficients in the forward calculation can be reduced. Thus, the rate of the inversion iteration can be increased by 6—10 times, a set of suitable programs having better applied effects are made.
出处
《物探化探计算技术》
CAS
CSCD
1991年第2期116-128,共13页
Computing Techniques For Geophysical and Geochemical Exploration
