Water-rich analysis of aquifer in the weathering zone of bedrock based on logging constraint inversion
Inversion is an important means for the interpretation of transient electromagnetic information.Due to the inade-quate high-low frequency information,there exists the shortages of poor lateral continuity,low longitudinal resolution and poor control capability for data,thus having a poor scaling capability for the space of strata.In order to improve the inversion accuracy,a constrained geologic model is built based on the Occam algorithm and logging curve.With the detailed inversion of logging information and taking a certain coal mine in northern Shaanxi as the research object,the traditional smooth model is compared with the constrained geological model.The research results show that the two models have a high degree of fit-ting with the measured data,but the smooth model is easily affected by the transition point of the curve tail,thus loss of true geological information.The logging constraint model can make full use of the electrical characteristics of each stratum in the area to reduce sudden changes and strengthen horizontal continuity,the longitudinal resolution is also improved to a certain extent,and the inversion results are consistent with the actual conditions,which can be adopted as a commonly used inver-sion means for boosting the information interpreting accuracy.
transient electromagneticconstraint inversionOccam algorithmlogging curve constraintbedrock weathering zone
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