電気探査による地下情報の抽出・強調

抄録

The future effectiveness of resistivity method depends upon its ability to interpret field data obtained under more complex geological structure environments, such as weathered overburden layers, vertical contacts, faults, fracturezones, deep bed rocks or host rocks, near-surface lateral or local inhornogeneities and various topographies.
New electrical prospecting methods utilizing the large three-dimensional data and subsurface electrodes have become important exploration tools increasingly for detecting deeply located mineral or low mineralized deposit, energy and groundwater reservoirs, and geological faults or fractures.
First of all, this paper begins with a brief review of the three-dimensional space electrical simulation techniques, such as the 3D network and 2D-3D finite element methods. Second, a result of solid resistivity array simulation with random noises has been chosen to illustrate the range of applications to practical problems. Third, a successful extraction and enhancement of response due to target in complicated nontarget inhomogeneities is shown of hole-to-surface resistivity interpretation process. Consequently, the computerized section obtained by using the sensitivity distribution method and the solid electrical array pseudosection construction newly developed have been introduced as an aid to interpret the three-dimensional hole-to-surface or cross-hole resistivity data.