Method and system for correcting for offset-dependent directivit

Details Method and system for correcting for offset-dependent directivit Method and system for correcting for offset-dependent directivit

1998-06-04

2000-02-15

Oda, Christine K.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 47, G01V 136

Patent

active

060260572

ABSTRACT:
A method and computer system for correcting seismic signals in a seismic survey, sensed in horizontal and vertical directions at receiver locations, is disclosed. According to the disclosed method and system, the horizontal and vertical seismic signal traces are processed in prestack gathers, after normal move-out correction. For each reflection event indicated in the prestack gathers, a performance function is evaluated over a range of zero-offset directivity and directivity slope values, using the horizontal and vertical pressure wave components sensed at the receivers. The zero-offset directivity and directivity slope values that return the maximum performance function are stored in connection with the gather and the reflection event, as indicative of the zero-offset dip and offset-dependent directivity of the reflective surface corresponding to the reflected event. These zero-offset directivity and directivity slope values are then used to correct the traces, or generate a new trace, corresponding to the pressure wave signal that is in the true reflected wave ray direction, minimizing the component of the sensed pressure wave that is transverse to the longitudinal wave ray direction. Detection and analysis of pressure-to-shear wave conversion, as well as amplitude-versus-offset analysis, is then facilitated by the present invention.

REFERENCES:
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Dix, "Seismic Velocities from Surface Measurements", Geophysics, vol. XX, No. 1, (1955), pp. 68-86.
Berg, et al., "SUMIC: Multicomponent sea-bottom seismic surveying in the North Sea--Data interpretation and applications", Expanded Abstracts with Biographies, 1994 Technical Program of the SEG Int'l Exposition and 64.sup.th Annual Meeting (1994) pp. 477-480.
Kendall, et al., "Noise Analysis Using a Multicomponent Surface Seismic Test Spread", Expanded Abstracts with Biographies, 1993 Technical Program of the SEC Int'l Exposition and 63.sup.rd Annual Meeting (1993), pp. 566-568.

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