3-D seismic reflection surveys for direct detection of DNAPL

High resolution three dimensional (3-D) seismic reflection data have been collected at several sites where Dense Non-Aqueous Phase Liquids (DNAPL) are or are believed to be present. Confirmatory drilling and chemical analysis have been performed at some of these sites. The seismic surveys were performed to more completely characterize the structure and stratigraphy to delineate fluid migration pathways and traps. The feasibility of using seismic attribute analysis to directly image DNAPL was also demonstrated. Information from these studies can be used to better characterize sites and to optimally position remedial systems.