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Use of electric logs to estimate water quality of pre-tertiary aquifers

Ground Water

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Abstract

Electric logs provide a means of estimating ground-water quality in areas where water analyses are not available. Most of the methods for interpreting these logs have been developed for the petroleum industry and are most reliable in saline aquifers (concentration of dissolved solids as sodium chloride greater than about 500,000 mg/l). The resistivity-porosity and spontaneous-potential methods were evaluated to determine if they could be applied to identify zones of fresh water (concentration of dissolved solids as sodium chloride less than 1,000 mg/l) in three potential aquifers in central Wyoming. The potential aquifers have different lithologies - sandstone, clayey sandstone, and carbonate. The two methods generally were reliable predictors of water quality in the sandstone and carbonate potential aquifers. In the clayey sandstone potential aquifer, predictions of the dissolved-solids concentration using the two methods differed by more than an order of magnitude in several cases. When the resistivity values are corrected for the presence of clay and shale as identified on a natural gamma log, the agreement between the results of the two methods improved by an average of 58 percent.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Use of electric logs to estimate water quality of pre-tertiary aquifers
Series title:
Ground Water
Volume
33
Issue:
4
Year Published:
1995
Language:
English
Publisher:
Ground Water Publishing
Publisher location:
Dublin, OH, United States
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
547
Last page:
555
Number of Pages:
9