1-D Laterally Constrained Inversion of Em34 Profiling Data

Journal of Applied Geophysics（2004）SCI 3区

Univ Lisbon

Cited 134|Views1

Abstract

In this paper, the applicability of a smooth regularised inversion technique to electromagnetic (EM) data collected along profiles using EM34 system is examined. The inversion algorithm, which is a modified 1-D inversion with 2-D smoothness constraints between adjacent 1-D models, is briefly presented. Forward and sensitivity calculations are based on cumulative response functions. The algorithm was evaluated using data generated from synthetic models. The best results can be obtained under the following conditions: (1) the data set contains measurements from, at least, two intercoil distance; (2) the geoelectrical structure of the earth is predominantly 1-D; (3) the structures showing 2-D behaviour are not too close to each other. Two examples, using data acquired for hydrogeological studies, are used to evaluate the practical usefulness of the algorithm. The general patterns of the inverted models are shown to compare favourably with resistivity well logs from boreholes drilled in the vicinity of the profiles.

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Key words

electromagnetic profiling,data inversion,geophysics,environmental investigation,conductivity mapping

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