Study on data processing and interpretation system of time-domain "mise-a`-la-masse" method

The "mise-a`-la-masse" method is one of the important electrical prospecting methods used to explore and assess metallic ore. It has been applied broadly, developed prosperously, but still has some problems to resolve. This paper studies the means of data processing and interpretation for the time-domain "mise-a`-la-masse" method and works out the corresponding program. The preliminary system includes the following three parts: (1) a ratio technique for terrain correction and Fraser filtering of electric potential gradient data; (2) a normalized total gradient method to quantitatively resolve geometric parameters of an abnormal body; and (3) a BK inversion method and multi-resolution analysis BK inversion method to retrieve resistivity and chargeability parameters of that abnormal body. The normalized total gradient method is initially used in the system to qualitatively and quantitatively interpret the data from different directions, and the multi-resolution analysis is also innovatively used in the BK inversion in order to lessen the non-uniqueness and unsteadiness. We can get some geometrical and geophysical parameters at the same time using this system for the first time. Tested and verified by laboratory experimental data, numeric simulated data and field data, it is demonstrated that the system is a good one which is worthy of developing further and applying in practice