Using High-Resolution Reflection Seismic To Image Free Phase DNAPL'S At the M-Area, Savannah River Site
WADDELL, MICHAEL G., TOM J. TEMPLES
One of the most difficult problems in designing a remediation plan for cleaning up DNAPL contamination is locating the "pools" of free phase DNAPL. The modeling of a DNAPL saturated sand verses a water saturated sand suggests with 120Hz frequencies or higher there would be an AVO anomaly. Acquisition parameters for imaging the DNAPL was derived from an AVO model, which was based upon previously acquired seismic and well data. This would allow the data set to be processed using AVO techniques. The seismic line was located in such a manner that it started in area where the unconsolidated sand was water filled and crossed a known pool of free phase DNAPL saturated sand and continue back into a water saturated sand. Using a weighted stacking processing technique ( Smith and Gidlow, 1987) a fluid factor stack was generated from the data set. The results from the fluid factor stack indicated an anomaly at the depth and location of the known free phase DNAPL plume. The initial results suggest that under certain conditions, free phase DNAPL can be imaged using high resolution reflection seismic if there is enough free phase product in the ground.