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Proceedings Paper

Elastic wave equation travel time and waveform inversion of crosshole seismic data
Author(s): Changxi Zhou; Gerard T. Schuster; Siamak Hassanzadeh
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Paper Abstract

We apply the elastic wave equation traveltime and waveform inversion (elastic WTW) method to the McElroy crosshole data. These data are characterized by a well offset of 184 ft and a wide-band source wavelet (250 - 2000 Hz). Numerical tests indicate that the following processing steps are necessary, but not sufficient, for successful waveform inversion: FK filtering of the upgoing and downgoing waves, FK-fan filter extraction of the PP and SS reflections, and balancing the amplitudes of the upgoing and downgoing reflections. To reduce the complexity of the data we follow the divide and conquer strategy, i.e., extract the PP reflections and SS reflections, then invert each wave mode separately. Numerical results show that the vertical spatial resolution of the WTW P-wave and S-wave tomograms are approximately 7 - 10 feet and 4 feet, respectively. This compares favorably to the 40 - 50 feet vertical resolution of the P-velocity tomogram obtained from the first arrival traveltime data. There is good to very good agreement between the sonic logs and the velocity from the WTW tomogram. These preliminary results demonstrate that high resolution Poisson ratio, S- velocity, and P-velocity tomograms can be extracted from crosshole data, and therefore can be used for lithological interpretation.

Paper Details

Date Published: 23 September 1994
PDF: 11 pages
Proc. SPIE 2301, Mathematical Methods in Geophysical Imaging II, (23 September 1994); doi: 10.1117/12.187494
Show Author Affiliations
Changxi Zhou, Univ. of Utah (United States)
Gerard T. Schuster, Univ. of Utah (United States)
Siamak Hassanzadeh, Sun Microsystems Computer Corp. (United States)

Published in SPIE Proceedings Vol. 2301:
Mathematical Methods in Geophysical Imaging II
Siamak Hassanzadeh, Editor(s)

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