Seismic reflection survey for mapping groundwater migration pathways At Tinker AFB, Oklahoma
- IT Corp., Knoxville, TN (United States)
- OC-ALC/EMR, Tinker AFB, OK (United States)
- Colorado School of Mines, Golden, CO (United States). Dept. of Geophysics
- IT Corp., Monroeville, PA (United States)
Optimal placement of groundwater recovery wells in complex geologic environments often requires more subsurface information than is available from boring log data, typically from widely spaced wells. A two-dimensional (2-D) seismic reflection survey was conducted in the area of a planned groundwater recovery wellfield in the southwest quadrant of Tinker Air Force Base (AFB) to help identify and map possible conduits for preferential groundwater flow in the shallow subsurface. The primary targets of interest were near-surface sand channels and lenses within the upper portion of the Permian-age Garber Formation, although the dataset also provided significant information on deeper layers. The seismic data were acquired along eight survey lines totaling 17,510 linear feet. The geophysical investigation at Tinker AFB included evaluating shear-wave (s-wave) and compressional wave (p-wave) seismic techniques along a short portion of one line to determine the best approach for the entire survey. Based on the processed test sections, and consideration of s-wave data acquisition and processing costs, it was decided the p-wave survey offered an acceptable approach. The investigation also included acquisition of vertical seismic profile (VSP) data, generating a synthetic seismogram from an existing sonic log, and collecting EM-31 data along each line to assess the effect changes in near-surface soils, buried debris, and utilities had on the seismic data. Seismic data were interpreted with the aid of PC-based software. To better understand the geometry and amplitudes of some of the features observed in the site data, seismic models were generated with different combinations of velocity and layer thickness. The interpreted seismic data indicate several locations where the potential for drilling into significant sand lenses in the target zone is believed to be high.
- OSTI ID:
- 679407
- Report Number(s):
- CONF-980632-; TRN: IM9940%%226
- Resource Relation:
- Conference: 91. annual meeting and exhibition of the Air and Waste Management Association, San Diego, CA (United States), 14-18 Jun 1998; Other Information: PBD: 1998; Related Information: Is Part Of Proceedings of the 91. annual meeting and exhibition. Bridging international boundaries: Clean production for environmental stewardship; PB: [5000] p.
- Country of Publication:
- United States
- Language:
- English
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