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直流电法有效探测深度的确定是地球物理电法研究的焦点,其与最终数据解释的可靠程度紧密相连,不准确的探测深度可能会造成漏解释或过度解释.修正的DOI(Depth of Investigation)方法被用于确定直流电法的有效探测深度.该方法是在DOI法的基础上提出,针对原始采集数据的两个不同电阻率参考模型的反演结果,利用统计学方法和无约束非线性优化方法处理数据,最终得到透明索引指标,从而获得有效探测深度边界.该方法有效规避了人为选用截断阈值来确定有效探测深度的缺点.在工程实例应用上也取得了较好的效果,这对未来直流电法有效探测深度的确定具有重要应用价值.
The determination of the effective detection depth by direct current method is the focus of geophysical electrical method, which is closely related to the reliability of the final data interpretation, inaccurate detection depth may cause leakage or over-interpretation. The revised DOI (Depth of Investigation) method Is used to determine the effective detection depth of DC method.The proposed method is based on the DOI method. For the inversion results of two different resistivity reference models of the original collected data, a statistical method and an unconstrained nonlinear optimization method Processing the data and finally get the index of transparent index to get the effective detection depth boundary.The method effectively avoids the shortcoming that the artificial selection of the cutoff threshold to determine the effective detection depth.It has also achieved good results in the application of engineering examples, The determination of effective exploration depth has important application value.