Traveltime generation in the presence of velocity discontinuitie

Details Traveltime generation in the presence of velocity discontinuitie Traveltime generation in the presence of velocity discontinuitie

1996-10-15

1998-03-03

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 53, 367 73, G01V 128, G01V 130

Patent

active

057243107

ABSTRACT:
An array of output image points is distributed over a velocity model of a subsurface region of interest. A fan of rays is shot from each of a plurality of acoustic source points along the surface, the angular separation between the rays being equal to .pi.
, where n is the number of rays. A family of traveltime wavefronts is erected at selected time intervals, .DELTA.t, along the ray trajectories. The resulting wavefront map is superimposed over the array of output image points. Sub-arrays of output image points will lie within discrete traveltime cells, the widths of which are defined by the separation between adjacent rays paths and the heights are defined by the wavefront separation distance. Ray segments, wavefront segments and output image points are identified by a velocity layer index. A velocity interface that may cut across a traveltime cell, divides the cell into two parts, each having a different layer index. The traveltime to be assigned to a selected output image point is determined by projection from a nearby wavefront segment that has the same layer index as that of the output image point.

REFERENCES:
patent: 5067113 (1991-11-01), Hanson et al.
patent: 5157637 (1992-10-01), Wang
patent: 5229938 (1993-07-01), Wang et al.
patent: 5265068 (1993-11-01), Wang et al.

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