Physics – Geophysics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3117606w&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 17, CiteID L17606
Physics
Geophysics
14
Exploration Geophysics: Data Processing, Seismology: Body Wave Propagation, Exploration Geophysics: Seismic Methods (3025), History Of Geophysics: Seismology, Physical Properties Of Rocks: Wave Attenuation
Scientific paper
Q analysis refers to the procedure for estimating Q directly from a reflection seismic trace. Conventional Q analysis method compares two seismic wavelets selected from different depth (or time) levels, but picking ``clean'' wavelets without interferences from other wavelet and noise from a reflection seismic trace is really a problem. Therefore, instead of analysing individual wavelets, I perform Q analysis using the Gabor transform spectrum which reveals the frequency content changing with time in a seismic trace. I propose two Q analysis methods based on the attenuation function and compensation function, respectively, each of which may produce a series of average values of Q-1 (inverse Q), averaging between the recording surface (or the water bottom) and the subsurface time samples. But the latter is much more stable than the former one. I then calculate the interval or layered values of Q-1 by a constrained linear inversion, which produces a stable estimation of the interval-Q series.
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