Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Reexamination Certificate
2007-06-12
2007-06-12
Lobo, Ian J. (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
C367S052000, C702S017000
Reexamination Certificate
active
11056640
ABSTRACT:
The present invention provides a method and apparatus for arriving at true relative amplitude destretched seismic traces from stretched seismic traces. The method compensates for offset varying reflection interference effects due to normal moveout. Stretch factors β and also input spectra are determined for NMOR stretched seismic traces. Estimates are then made of stretched wavelet spectra from the input spectra. A destretched wavelet spectra is then obtained. Shaping correction factors are determined by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra and are applied to the input spectra of the stretched traces to arrive at a destretched trace spectra. True relative amplitude scaling factors are computed by taking the ratio of a true relative amplitude property of the destretched wavelet spectra to a corresponding true relative amplitude property of the stretched wavelet spectra. Finally, the true relative amplitude scaling factors are applied to the destretched trace spectra to arrive at true relative amplitude destretched seismic traces.
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Swan, Herbert W., Removal of offset-dependent tuning in AVO analysis, ARCO Exploration and Production Technology, A division of Atlantic Richfield Company, AVO 2.5, pp. 175-178.
Alford Richard B.
Herkenhoff E. Frederic
Martin Harry L.
Chevron U.S.A. Inc.
Lobo Ian J.
Teixeira Maurice E.
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