ABSTRACT
Borehole geophysics is commonly applied to many aspects of environmental investigations, including selecting disposal sites, monitoring and mapping of contaminant distribution, verifying construction of monitoring and injection wells, and planning remediation programs. In planning a logging program for environmental applications one of the most difficult questions to answer is what geophysical logs will provide the most information for the funds available. The specific purposes of borehole geophysics in any environmental project must be clearly defined before a cost-effective logging program can be designed. The same logs used in unconsolidated materials should be used in detrital sedimentary rocks, but where wells are uncased, single-point resistance, multielectrode resistivity, and acoustic-velocity logs can provide information on lithology and the acoustic televiewer can be used to characterize secondary porosity. The most significant effect of hydrology on log selection is related to the location of the water table and water level in the wells.
