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.