Method for extending the lateral subsurface coverage in VSP surv

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type

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367 61, G01V 116, G01V 136

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048478130

ABSTRACT:
In a VSP survey, the subsurface coverage of the bounce points of primary reflections is limited to one-half the offset between a borehole and a seismic-source point. The subsurface coverage may be extended by use of selected multiply-reflected wavefield arrivals.

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patent: 3371310 (1968-02-01), Silverman
patent: 4380059 (1983-04-01), Ruehle
patent: 4627036 (1986-12-01), Wyatt
Vertical Seismic Profiles: Their Application to Geophysics Geophysical Prospecting, 1980, pp. 676-699.
Computer Processing of Vertical Seismic Profile Data Geophysics, 1983, pp. 272-287.
"Migration of VSP data by Ray Equation Extrapolation in 2D Variable Velocity Media," Geophysical Prospecting, V34, N5, 8/86, Liang-Zie Hu et al.
Bois et al., "Well-to-Well Seismic Measurements," Geophysics, vol. 37, #3, Jun. 1972.
Morgan, D. R., "A Novel Broad-Band Beamformer," J. Acoust. Soc. Amer., vol. 56, #3, Sep. 1974.
Verm et al., "Imaging VSP's 3 Kilometers Beyond the Borehole Receiver," OTC 5570, 4/27/87.

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