电阻率法地形改正的多项式快速计算方法

在金属矿电法勘探或工程、水文电法勘探中,复杂的地形往往使有用异常面目皆非。因而,在用电测资料进行地质解释时,克服地形影响一直是重要问题之一。理论研究和大量野外实践都已充分征明,用比较法进行地形改正可在很大程度上削弱地形干扰,突出有用异常,从而有效地提高了电法勘探的地质效果。

FAST CALCULATION USING POLYNOMES FORTOPOGRAPHIC CORRECTION INRESISTIVITY METHOD

It is well-known that the distortion potential is a complicated function of both the terrain angle and the electrode spacing. In this paper polynomes are used to approximate the function, so that the calculation involved becomes quite simple. Afast computer program has been developed for topographic correction in resistivity method (omitted in this paper). Comparing to the results of analytical solution, the mean relative error is less than±0.1%, which meets the needs of field work. By virtue of the simplicity of the formula, calculations can be easily accomplished with a calculator. As a result, it provides a simple and fast technique of topographic correction for prompt and in-situ calculation of large amount of electrical survey data.