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An acoustic-logging transmission-network model.

Lin Fa1, John P Castagna, Jens M Hovem

  • 1Sarkeys Energy Center, Norman, Oklahoma 73019, USA.

The Journal of the Acoustical Society of America
|June 8, 2002
PubMed
Summary
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Acoustic logging is modeled as a signal transmission system. This helps understand how voltage signals become recorded acoustic logs, considering borehole and formation properties.

Area of Science:

  • Geophysics
  • Acoustics
  • Well Logging

Background:

  • Acoustic logging is crucial for characterizing subsurface formations.
  • Understanding the signal path in acoustic logging is complex.
  • Existing models may not fully capture all transmission aspects.

Purpose of the Study:

  • To present a comprehensive transmission network model for the acoustic logging process.
  • To elucidate the relationships between various components of the acoustic logging system.

Main Methods:

  • Describing acoustic logging as a signal transmission system.
  • Developing a transmission network model to link input and output signals.
  • Analyzing the influence of different physical parameters on signal propagation.

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Main Results:

  • The model establishes clear relationships between the driving voltage and the recorded logging signal.
  • It details the transformations occurring at the source and receiver (electrical-acoustic and acoustic-electrical conversion).
  • The model incorporates the acoustic properties of the borehole fluid and surrounding formation.

Conclusions:

  • The proposed transmission network model provides a robust framework for understanding acoustic logging.
  • This model aids in interpreting acoustic logging data by clarifying signal pathways and transformations.
  • It highlights the importance of medium properties and conversion efficiencies in the overall logging response.