Field tapes from a deep seismic survey for petroleum exploration were reprocessed in order to extract seismic information on shallow reflectors for use in ground-water exploration. Apotable aquifer in eastern Abu Dhabi occurs at depths less than 150 m. Field methods, acquisition parameters, and section processing were originally designed to enhance reflectors expected at depths up to 6,000 m. Seismic data collected from depths of about 110-330 mwere muted from the original sections, so that all seismic data concerning the aquifer were deleted from these sections. Reprocessing efforts concentrated on restoring information for the first second of seismic data.Aunique sequence of reprocessing parameters was established based on results from many experimental trials. Major enhancements to the resolution of shallow reflectors resulted from: (1) application of a 20-hertz, low-cut filter; (2) recomputation of static corrections to a datum nearer the land surface; (3) intensive velocity analyses; and (4) near-trace muting analyses. The number, resolution, and continuity of shallow reflectors were greatly enhanced on the reprocessed sections, as was the delineation of major faults and folds. The 33 reprocessed sections were instrumental in preparing a map of the major structural features Which affect the shallow aquifer system.Results from this study show that seIsmIC field tapes collected for deep petroleum exploration can also be reprocessed to explore for shallow ground water. 257
Field tapes from a deep seismic survey for petroleum exploration were reprocessed in order to extract seismic information on shallow reflectors for use in ground-water exploration. Apotable aquifer in eastern Abu Dhabi occurs at depths less than 150 m. Field methods, acquisition parameters, and section processing were originally designed to enhance reflectors expected at depths up to 6,000 m. Seismic data collected from depths of about 110-330 mwere muted from the original sections, so that all seismic data concerning the aquifer were deleted from these sections. Reprocessing efforts concentrated on restoring information for the first second of seismic data.Aunique sequence of reprocessing parameters was established based on results from many experimental trials. Major enhancements to the resolution of shallow reflectors resulted from: (1) application of a 20-hertz, low-cut filter; (2) recomputation of static corrections to a datum nearer the land surface; (3) intensive velocity analyses; and (4) near-trace muting analyses. The number, resolution, and continuity of shallow reflectors were greatly enhanced on the reprocessed sections, as was the delineation of major faults and folds. The 33 reprocessed sections were instrumental in preparing a map of the major structural features Which affect the shallow aquifer system.Results from this study show that seIsmIC field tapes collected for deep petroleum exploration can also be reprocessed to explore for shallow ground water. 257
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