Amplitude loss of sonic waveform due to source coupling to the medium

Details Amplitude loss of sonic waveform due to source coupling to the medium Amplitude loss of sonic waveform due to source coupling to the medium

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3405303l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 5, CiteID L05303

Physics

Geophysics

3

Exploration Geophysics: Downhole Methods, Marine Geology And Geophysics: Gas And Hydrate Systems, Mathematical Geophysics: Wave Propagation (0689, 2487, 4275, 4455, 6934)

Scientific paper

In contrast to hydrate-free sediments, sonic waveforms acquired in gas hydrate-bearing sediments indicate strong amplitude attenuation associated with a sonic velocity increase. The amplitude attenuation increase has been used to quantify pore-space hydrate content by attributing observed attenuation to the hydrate-bearing sediment's intrinsic attenuation. A second attenuation mechanism must be considered, however. Theoretically, energy radiation from sources inside fluid-filled boreholes strongly depends on the elastic parameters of materials surrounding the borehole. It is therefore plausible to interpret amplitude loss in terms of source coupling to the surrounding medium as well as to intrinsic attenuation. Analyses of sonic waveforms from the Mallik 5L-38 well, Northwest Territories, Canada, indicate a significant component of sonic waveform amplitude loss is due to source coupling. Accordingly, all sonic waveform amplitude analyses should include the effect of source coupling to accurately characterize a formation's intrinsic attenuation.

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