Method for determining formation quality factor from seismic...

Details Method for determining formation quality factor from seismic... Method for determining formation quality factor from seismic...

2005-08-16

2005-08-16

McElheny, Jr., Donald (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

Reexamination Certificate

active

06931324

ABSTRACT:
A method is disclosed for calculating the quality factor Q from a seismic data trace. The method includes calculating a first and a second minimum phase inverse wavelet at a first and a second time interval along the seismic data trace, synthetically dividing the first wavelet by the second wavelet, Fourier transforming the result of the synthetic division, calculating the logarithm of this quotient of Fourier transforms and determining the slope of a best fit line to the logarithm of the quotient.

REFERENCES:
patent: 5724309 (1998-03-01), Higgs et al.
Taner, M., “Joint Time/Frequency Analysis, Q Quality Factor and Dispersion Computation Using Gabor-Morlet Wavelets or the Gabor- Morlet Trans.”, Rock Solid Images, Jan. 2002.
Fatti, J. et al., “Detection of gas in sandstone reservoirs using AVO analysis. A 3-D seismic case history using the Geostack technique”, Geophysics v. 59, No. 9, Sep. 1994.

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