Method and apparatus for true relative amplitude correction of seismic data for normal moveout stretch effects
First Claim
1. A method for arriving at true relative amplitude destretched seismic traces from stretched seismic traces, the method comprising the steps of:
- a. acquiring stretched seismic traces;
b. determining stretch factors β
for the stretched seismic traces;
c. determining input spectra for the stretched seismic traces;
d. determining estimates of stretched wavelet spectra from the input spectra;
e. obtaining a destretched wavelet spectra;
f. determining shaping correction factors by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra;
g. applying the shaping correction factors to the input spectra of the stretched traces to arrive at a destretched trace spectra;
h. computing true relative amplitude scaling factors 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; and
i. applying the true relative amplitude scaling factors to the destretched trace spectra to arrive at true relative amplitude destretched seismic trace whereby the true relative amplitude property of the stretched wavelet spectra is substantially preserved.
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Accused Products
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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Citations
12 Claims
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1. A method for arriving at true relative amplitude destretched seismic traces from stretched seismic traces, the method comprising the steps of:
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a. acquiring stretched seismic traces; b. determining stretch factors β
for the stretched seismic traces;c. determining input spectra for the stretched seismic traces; d. determining estimates of stretched wavelet spectra from the input spectra; e. obtaining a destretched wavelet spectra; f. determining shaping correction factors by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra; g. applying the shaping correction factors to the input spectra of the stretched traces to arrive at a destretched trace spectra; h. computing true relative amplitude scaling factors 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; and i. applying the true relative amplitude scaling factors to the destretched trace spectra to arrive at true relative amplitude destretched seismic trace whereby the true relative amplitude property of the stretched wavelet spectra is substantially preserved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for arriving at true relative amplitude destretched seismic traces from stretched seismic traces, the method comprising the steps of:
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a acquiring stretched seismic traces; b determining stretch factors β
for the stretched seismic traces;c. determining input spectra for the stretched seismic traces; d. determining estimates of stretched wavelet spectra from the input spectra; e. obtaining a destretched wavelet spectra; f. determining shaping correction factors by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra; g. applying the shaping correction factors to the input spectra of the stretched traces to arrive at a destretched trace spectra; h. computing true relative amplitude scaling factors 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; and i. applying the true relative amplitude scaling factors to the destretched trace spectra to arrive at true relative amplitude destretched seismic trace whereby the true relative amplitude property of the stretched wavelet spectra is substantially preserved.
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Specification