HR: 09:45h
AN: NS21A-06    [Abstracts]
TI: Velocity Modeling of Land 3-D Surface Seismic Data for Prestack Depth Migration
AU: Duncan, W S
EM: wsduncan_geo@yahoo.com
AF: University of Houston Allied Geophysical Laboratories, Science and Research 1 Room 504 , Houston, TX 77204-5505 United States
AU: * Zhou, H
EM: hzhou@uh.edu
AF: University of Houston Allied Geophysical Laboratories, Science and Research 1 Room 504 , Houston, TX 77204-5505 United States
AB: Since the early 1990's prestack depth migrations (PSDM) have been routinely applied to 3-D seismic data. Using current methods building an accurate velocity model is dependent on the quality of the seismic data. Data quality is a reason why PSDM have been applied nearly exclusively to marine data. To apply the power of PSDM to land 3-D surface seismic data deriving an initial sediment velocity model that overcomes limitations of data quality associated with land 3-D seismic data is essential. In this study I use a non-seismic approach to generate an initial sediment velocity model for PSDM of land 3-D surface seismic data. Differences in data quality between marine and land 3-D seismic data provided the motivation to investigate innovative velocity modeling techniques for land 3-D surface seismic data. In this study current practices primarily for marine data were reviewed and problems with land 3-D surface seismic data were identified. An approach that integrates the efficiency and accuracy of current methods and overcomes the limitations imposed by data quality was implemented. Data were acquired over Vinton Dome in southwest Louisiana and used in this case study to derive an initial sediment velocity model using sonic logs. Comparing the results with a prestack time migration (PSTM) and a PSDM that had been migrated using a seismically derived velocity model demonstrated that this approach enhanced the fidelity of the Vinton Dome 3-D surface seismic data.
DE: 0935 Seismic methods (3025)
SC: Near-Surface Geophysics [NS]
MN: 2005 Joint Assembly