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本文对水平地层电阻率测深中出现的似非而是现象,用线性数字滤波法的计算结果肯定了它的存在,明确了该现象只在具有低阻导电基底的断面上才能产生,并对其物理实质作了定性解释。文中重点研究了临界极距及视电阻率的最在离差与表层电阻率和厚度的定量关系,并对具有低阻导电基底的三层断面,当第一层局部加厚时,用边界元数值方法计算了大于临界极距的对称四极视电阻率剖面曲线,所得结果有力地说明了似非而是现象在资料解释中的实际意义。
In this paper, the phenomenon of horizontal formation resistivity sounding appears to be non-true. The linear digital filter method is used to confirm the existence of this phenomenon. It is clear that this phenomenon can only occur on the cross-section with low resistance conductive substrate. The physical substance made a qualitative explanation. In this paper, the quantitative relationship between the maximum deviation of critical polar distance and apparent resistivity and the surface resistivity and thickness is studied emphatically. For the three-layer cross-section with low resistivity conductive substrate, when the first layer is locally thickened, The numerical method calculates the profile of the symmetrical quadrupole apparent resistivity profile that is greater than the critical pole pitch, and the results give a powerful explanation of the nonsense phenomenon in data interpretation.