Correlation of vertical electrical sounding and borehole-log data for delineation of saltwater and freshwater aquifers

Author:

Hodlur G. K.1,Dhakate Ratnakar1,Andrade Rolland1

Affiliation:

1. National Geophysical Research Institute, Council of Scientific & Industrial Research, Uppal Road, Hyderabad 500007, India..

Abstract

In a case history from the Mahanadi basin (India), we demonstrate the use of resistivity data from electric-log soundings and from borehole logs to discriminate between saltwater and freshwater aquifers. We use interpreted data from eight surface-based vertical electrical soundings (VES) and electric well logs from three boreholes in this study. We establish a quantitative relation among longitudinal unit conductance S (obtained from VES), water resistivity [Formula: see text], and layer thickness h. We show that ambiguities in resistivity data interpretation limit its ability to distinguish between freshwater and saltwater aquifers. Electric well-log data interpretation is much more accurate but requires boreholes, which are not cost effective when exploring for groundwater. Integrating well-log-based estimates of [Formula: see text] into resistivity interpretation of surface-based soundings improves its ability to discriminate freshwater aquifers while maintaining cost-effective exploration.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

Reference12 articles.

1. Alger, R. P., 1966, Interpretation of electric logs in fresh water wells in unconsolidated formation: 7th Annual Logging Symposium, Society of Professional Well Log Analysts, Transactions, CC1-CC25.

2. Role of some salient geophysical, geochemical, and hydrogeological parameters in the exploration of fresh groundwater in a brackish terrain

3. Stable Iterative Methods for the Inversion of Geophysical Data

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