Research On Forward Modeling And Inversion Of Multi-electrode Resistivity Method

Electrical prospecting is a comprehensive geophysical exploration method in the basic methods. Multi-electrode resistivity method as a branch of electrical exploration, is a better and more economical exploration method, and has played a major role in urban engineering, environmental geological survey, geology for water, the archaeological, pipe and cable detection, and some other areas. In karst, hydrology, construction, testing and other areas, the application of Multi-electrode resistivity method is far greater than the theoretical expectations.This paper systematically discuss the basic theory , history, development and research status, inversion techniques of high-density resistivity method , and study the equipment progress with the national economy's development and computer technology progress. In this paper, we also described removing mutations method of data pre-processing. In this paper, previously, high-density parameters were researched, treatmentmethod of conventional parameters was outlined, then the different ratio parameters can be studied, respectively, on theλor G, and T parameter, the research conclusion and effects of the ratio parameters is shown. Second, the forward modeling and inversion of high density resistivity were studied. The reliability and application of res2dmod was verified, and then forward modeling was done on the theory model by using those programs as a tool. 5 percent noise was added in available forward data for inversion data; the abnormal response characteristics of different depth was studied with geological body, as well as different arrays , in details, the modeling and inversion results were compared, and then the inversion results compared with the theoretical model forward. We had a conclusion of different depths or arrays, the inversion law of different arrays was summarized, which provide a theoretical basis and reference to field work equipment selected .At last, In accordance with the design work and the topographic and geologic conditions of work area, prospecting purpose focused on important outcomes, Datum from field work was processed by Chinese Version with RES2DINV. Applying in professional theories and methods of High density and IP method ,the results of three selected application examples were analyzed by using inversion techniques, in those inversion graphs, ore body shape, size and condition to the extension of the deep were shown.