Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1990-08-27
1991-10-29
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 73, G01V 128
Patent
active
050620860
ABSTRACT:
A method for calculation of raypaths and wavepaths from traveltime tables for the tomographic estimation of transmission velocities includes picking the earliest traveltime of waves transmitted between different source and receivers locations. A velocity model that describes transmission velocities in a region of interest is obtained. Traveltime from each source position to each point in the region of interest and traveltimes from each receiver loaction to each point in the region of interest are extrapolated. The extrapolated traveltimes from the source and receiver to each point in the region of interest are added together to quantify the path of a wave between one source and one receiver. All points in the region of interest whose total traveltimes are less than half a wavelength greater than the minimum traveltime are found. A representative raypath that passes through the center of the estimated wavepath region for each source and receiver location are saved. The previous model of velocities are improved by tomographic means to increase the match between the recorded and modeled traveltimes along the representative raypaths.
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Ivansson, S.; "A Study of Methods for Tomographic Velocity Estimation in the Presence of Low Velocity Zones", Geophysics, vol. 50, #6, pp. 969-988, Jun. 1988.
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1989 International Mtg. and Exposition, article entitled, "Efficient Seismic Ray Tracing Using Graph Theory", by T. J. Moser, pp. 1106-1108.
1989 International Mtg. and Exposition, article entitled, "Finite Difference Calculation of Traveltimes in 3-D", by John E. Vidale, pp. 1096-1098.
Hanson Douglas W.
Harlan William S.
Wang Shein S.
Conoco Inc.
Lobo Ian J.
LandOfFree
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