INTERPRETATION OF APPARENT RESISTIVITY DATA FROM APODI VALLEY, RIO GRANDE DO NORTE, BRAZIL

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Abstract
One hundred and twelve Schlumberger vertical electrical soundings were made as part of a hydrogeological study in the Apodi Valley, Brazil. Most of the data have been interpreted using an automatic ridge regression inversion algorithm in conjunction with a fast digital filter forward algorithm. As a result, the inversion costs are very low. The increase in speed and accuracy in the evaluation of the forward problem has also allowed calculation of the Schlumberger apparent resistivity from potential differences, instead of the electric field. Consequently, there is no difficulty in the interpretation of data where very large receiver electrode (MN) spacings have been used or where discontinuities have been introduced by changing the MN spacing on a layered earth containing large resistivity contrasts. The soundings were conducted primarily to map the thicknesses of a known alluvial aquifer and a potential sandstone aquifer. These thicknesses have been determined to within an error of 20 percent as estimated from analysis of the parameter standard deviations and comparison with available drill hole information.

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