Mine The Observation Parameters Of High-density Resistivity Method

Mine high density resistivity method is one of mine geophysical prospecting methods. It is based on the fact that there is resistivity difference to survey the target and its background geology, and will be good application prospect in thydrogeological investigation. Its application and development make the intelligent intensity of the electrical prospecting technology of the mine stride forward one step greatly. There is full-space field, drift space effect and the complicated interfere in the pit, which have restricted in the popularization and application of mine high density resistivity method in coal mine. The paper systematically has analyzed the characteristic of the influence of full space and drift space effect on mine high density resistivity method used in coal mine, and has separately calculated the correction coefficient of drift space influence to different arrays. On this basis, the paper has conducted the comparatively systematic experimental study on the anti-interference factor of mine high density resistivity method used in low SNR. Finally the paper utilizes numerical simulation technical to research the response characteristic to geology for various arrays, and to compare and analyze some applied examples.The research on observation parameter of mine high density resistivity method shows : (1) When instrument measure weak signal, measure error is slightly high , and the measure error reduces gradually with enhancement of signal. It is the longer to measure cycles, the stronger the capability of instrument recognition to the weak signal is, it is the less to measure the error. So mine high density resistivity method is used in the environment of low SNR, requires the instrument to possess stronger ability of anti-interferes of ground current.(2)Interferes of ground current is the intensity heavily, changes violently and irregularly. When mine high density resistivity method surveys in mine, by using non-polarizing electrodes, eliminating influence of industrial stray current and compensating the interference of ground current, it is effective to restrain the interference of ground current. And with the appropriate power supply time, SP drift may be restrained in surveying.(3)We may suitably discard a few electrode with ground resistance heavy to eliminate its influence, But with giving up the electricity pole number increasing, the distortion of surveying result increases, so we should control the percentage of giving up the electrode to ensure the accurate result of measuring. (4)It is different to the signal strength, the horizontal coverage, the depth of investigation and...