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实验室岩石趋肤深度分析有助于推断野外电磁法勘探深度.天然多孔岩石孔隙结构十分复杂,往往具有分形特征.研究表明,岩石的分形结构影响其电性特征,岩石的不同电性特征决定趋肤深度大小.本文分析综述了岩石电性特征的频率相关性及电性分形模型与趋肤深度的关系,发现趋肤深度δ与频率f之间存在幂律关系δ∝f-φ(指数φ反映岩石的分形结构特征对趋肤深度的影响);在低频时建立了趋肤深度与岩石的分形维数和电磁波频率、孔隙度和孔隙溶液电导率的分形解析模型,结果表明趋肤深度随着分形维数的增大而减小.由于岩石结构非均质性影响,野外勘查得到的电磁波趋肤深度往往小于实验室得到的趋肤深度.最后对电磁波在岩石中趋肤深度的研究做了总结和展望.
Laboratory rock skin depth analysis is helpful to infer the depth of field electromagnetic exploration.The porous structure of natural porous rock is very complicated and often has fractal characteristics.Research shows that the fractal structure of rock affects its electrical characteristics and different electrical characteristics of rock determine The depth of skin depth.This paper analyzes and summarizes the relationship between the frequency dependence of electrical characteristics of rocks and the relationship between electrical fractal model and skin depth and finds that there exists power law δαf-φ between skin depth δ and frequency f φ reflects the influence of the fractal structure of rock on the skin depth. At the low frequency, a fractal analytical model of skin depth and fractal dimension of rock and electromagnetic wave frequency, porosity and pore conductivity is established. The results show that skin depth And decreases with the increase of fractal dimension.Due to the heterogeneity of rock structure, the skin depth of electromagnetic wave obtained by field exploration is often less than the skin depth obtained by the laboratory.Finally, the study on the skin depth of electromagnetic wave in rock Made a summary and outlook.