1887
Volume 58, Issue 3
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

We have correlated the longitudinal unit conductance obtained from interpreted vertical electrical sounding data with the formation resistivity and the formation resistivity factor , obtained by carrying out electrical borehole logging. Interpreted geophysical data of eleven soundings and two electrical borehole log records are used for the analysis. The geophysical data used were acquired in a sedimentary basin. The study area is called Lower Maner Basin located in the province of Andhra Pradesh, India. Vertical electrical soundings were carried out using a Schlumberger configuration with half current electrode separation varying from 600–1000 m. For logging the two boreholes, a Widco logger‐model 3200 PLS was used. True formation resistivity was calculated from a resistivity log. Formation resistivity factor was also calculated at various depths using values. An appreciable inverse relation exists between the correlated parameters. The borehole resistivity and the formation resistivity factor decrease with the increase in the longitudinal unit conductance . We have shown the use of such a relation in computing borehole resistivity and formation resistivity factor at sites that posses only vertical electrical sounding data, with a fair degree of accuracy. Validation of the correlation is satisfactory. Scope for updating the correlation is discussed. Significance and applications of the relation for exploration of groundwater, namely to update the vertical electrical sounding data interpretation by translating the vertical electrical sounding data into electrical borehole log parameters, to facilitate correlations studies and to estimate the porosity (φ), permeability () and water saturation of water bearing zones are discussed.

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2009-10-02
2024-04-20
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