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Determination of Shear Wave Velocity and Attenuation From Waveforms in Low Velocity Formations

Author(s)
Toksoz, M. Nafi; Wilkens, R. H.; Cheng, C. H.
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Massachusetts Institute of Technology. Earth Resources Laboratory
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Abstract
In boreholes where formation shear velocity is lower than borehole fluid velocity neither refracted shear waves nor pseudo-Rayleigh waves can propagate. When frequency response of the sonde does not extend to low frequencies (e.g. 2 kHz) Stoneley waves are not excited efficiently. In such cases refracted P, leaking modes (PL) and fluid waves become dominant phases on a full waveform acoustic log. The P wave velocity can be determined from the first arrivals. Then, using synthetic microseismograms and a waveform matching technique, formation shear wave velocity and attenuation can be determined. This method· is demonstrated using data from a well in the Baltimore Canyon Trough area of the Atlantic margin.
Date issued
1984
URI
http://hdl.handle.net/1721.1/75039
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1984-08

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