Efficient generation of traveltime tables for two dimensional an

Details Efficient generation of traveltime tables for two dimensional an Efficient generation of traveltime tables for two dimensional an

1990-10-30

1991-11-19

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 73, G01V 128, G01V 130

Patent

active

050671138

ABSTRACT:
A method for rapidly and efficiently generating traveltime tables for application in depth migration initially includes receiving a velocity model which may include a plurality of velocities in multiple layers between various subsurface reflectors. The model is plotted on a two dimensional grid with the subsurface reflectors identified. A traveltime to the first reflector is determined. Traveltimes from the sources on each layer boundary to all grid points above the next reflector are determined. For the initial iteration, the layer boundary is the surface and the source is the actual source used in shooting the line. For layers below the surface there will be more than one source or secondary source. The actual determination of traveltimes for these lower layers may be done by comparing the traveltimes to all points on the first reflector. The minimum traveltime is selected as the true traveltime to the first reflector. Next, all points where the reflector intersects the grid are found. Using these intersection points, the traveltimes to the second reflector may be generated in a similar manner, determining traveltimes from a predetermined point on the reflector to the second reflector.

REFERENCES:
patent: 4839869 (1989-06-01), Corcoran
patent: 4953140 (1990-08-01), Dablain
patent: 4964088 (1990-10-01), Chittineni
patent: 4964103 (1990-10-01), Johnson

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