摘要
对于常规的直流电测深法,由于其电极距一般以近似等对数间隔逐渐增大,使得网格单元剖分呈现出不规则性.与高密度电阻率法测量装置对比,其对电极的利用率较低,仅几个电测深点的反演就需要很长的时间.为此,在反演过程中,将互换原理和Broyden的近似计算方法相结合来计算雅克比矩阵,在不降低反演精度的情况下,可以大大减少反演时间.通过对模拟数据和实测数据进行反演试算,验证了该计算方法是可行的.
In the traditional resistivity sounding method, the pole distance increases little by little with equal logarithm interval, which brings on grid irregular elements. In comparison with the HD measured configuration, it can＇t make full use of all poles. It takes much longer time to inverse only several sounding points, and in the calculation of partial derivatives Jacobian matrix. So in the inversion,the partial derivatives of the apparent resistivity is calculated with respect to model resistivity by means of the relationship between the source and receiver locations and Broyden＇s method,to save the inversion time and satisfy the inversion precision. It is proved that the algorithms of this paper is workable through inversing the modeling data and practical data.
出处
《桂林工学院学报》
北大核心
2006年第4期473-475,共3页
Journal of Guilin University of Technology
基金
广西科学研究与技术开发项目(桂科攻0428006-17)
关键词
二维反演
电测深
雅克比矩阵
2D inversion
resistivity sounding
Jacobian matrix
