In many parts of the world, techniques are needed to accurately assess the quality and quantity of fresh and saline groundwater resources. In determining the water quality of an aquifer there is certainly nothing equal to a laboratory analysis of the water. Unfortunately, however, water samples are frequently not available. This is true for fresh as well as saline water aquifers.

In the absence of a water analysis, water quality can be calculated from borehole geophysical logs. Often, this is the only available method. Plus, logging data are much more abundant and more easily accessible than water analyses. In hydrocarbon-producing areas tens of thousands of borehole geophysical logs are available for aquifers that have only a few water analyses.

Determining water quality from logs has long been a subject of interest to log analysts. However, most of the research has been conducted by the petroleum industry and has centered on very saline and brine waters. Few papers have addressed groundwater quality determination from logs of less saline waters.

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