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Phase-based dispersion analysis for acoustic array borehole logging data.

Said Assous1, Peter Elkington1, Laurie Linnett2

  • 1Geoscience Development, Weatherford, East Leake, Leicestershire LE12 6JX, United Kingdom.

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|September 20, 2014
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Summary
This summary is machine-generated.

This study introduces a new phase-based dispersion analysis for accurate velocity extraction from guided waves in geological formations. The data-driven method provides high-resolution results without prior assumptions, overcoming limitations of existing techniques.

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Area of Science:

  • Geophysics
  • Acoustic Logging
  • Wave Propagation

Background:

  • Guided wave analysis in boreholes is crucial for characterizing geological formations.
  • Existing methods for velocity extraction often suffer from aliasing and spurious modes.
  • Accurate dispersion analysis is essential for reliable formation evaluation.

Purpose of the Study:

  • To present a novel phase-based dispersion analysis method for velocity (slowness) extraction.
  • To develop a data-driven approach that overcomes limitations of prior methods.
  • To demonstrate the effectiveness of the proposed technique using synthetic and field data.

Main Methods:

  • Acquiring waveforms using an array of receivers on an acoustic borehole logging tool.
  • Processing data in the frequency domain to construct dispersion characteristics.
  • Exploiting phase information to measure travel time for each frequency component.

Main Results:

  • The method provides high-resolution velocity estimates without requiring velocity guesses or mode assumptions.
  • Results are free from aliasing and spurious modes common in other approaches.
  • Comparison with Weighted Spectral Semblance (WSS) and Amplitude and Phase Slowness Estimation (APES) validates the proposed method's utility.

Conclusions:

  • The phase-based dispersion analysis offers a robust and effective solution for guided wave velocity extraction.
  • This data-driven, nonparametric approach enhances the accuracy and reliability of borehole acoustic logging interpretations.
  • The method demonstrates significant advantages over traditional techniques for dispersion analysis.