激电测深数据一维自动迭代反演进行拟二维反演解释

为提高野外激电测深数据的处理效率和初步解释的精度,提出了激电测深数据一维自动迭代反演进行拟二维反演解释方法。本文所述的激电测深一维自动迭代反演解释,与以往的激电测深曲线自动解释方法不同,其主要特点是不用人工给定初始模型参数,即对实测电阻率曲线以采样间隔(如(lg10)/6)数字化后的点数作为层数,并且使其在整个反演过程中保持不变;以数字化后的相邻电极距的差作为层厚;以对应点的视电阻率值作为层阻,采用阻尼最小二乘法对同一断面的多条电测深曲线进行一维自动迭代反演。然后把反演结果绘制成断面图,对其进行二维地质推断解释。最后通过模型试算,结果表明其处理速度快,解释直观,对于作为野外激电测深数据的初步反演解释是可行的。

PSEUDO-2D INVERSION INTERPRETATION FOR IP SOUNDING DATA USING 1D AUTOMATIC ITERATIVE INVERSION METHOD

In order to improve the processing efficiency and precision of primary interpretation for IP sounding data,this paper puts forward the method of pseudo-2D inversion interpretation for IP sounding data using 1D automatic iterative inversion method which is different from former automatic interpretation methods for IP sounding.The main trait of this method is that it isn't necessary to input initial model parameters artificially before inversion.Namely it uses the number of observed apparent resistivity curve digitized with a sampling interval(e.g.lg10/6) as that of model layers and it remains unchanged during the iterative inversion course.The layered thickness of starting model is equal to the difference of digitized electrode spacing.The layered resistivity of starting model equals the apparent resistivity of discrete electrical sounding curve.So it is ready for the 1D automatic iterative inversion of many sounding curves using damping least square method.We may draw the figure of pseudosection of inversion result and carry out the geologic interpretation for it.Finally,it tests the effect of inversion for model data and shows that its processing speed is fast and interpretation is simple,so it is acceptable as primary inversion interpretation of IP sounding data.