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Three-Dimensional Acoustic Device for Testing the All-Directional Anisotropic Characteristics of Rock Samples.

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This study introduces a novel 3D measurement device for acoustic anisotropy in rock cores, crucial for oil and gas reservoir characterization and exploitation. The device enables comprehensive, all-directional analysis, improving drilling and well logging strategies.

Keywords:
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Area of Science:

  • Geophysics
  • Petrophysics
  • Materials Science

Background:

  • Formation anisotropy is prevalent in unconventional reservoirs like shale and compacted sand.
  • Accurate acoustic anisotropy measurements are vital for optimizing oil and gas exploration and production.
  • Existing core holders limit all-directional measurements, hindering comprehensive analysis.

Purpose of the Study:

  • To design and validate a 3D measurement device for comprehensive acoustic anisotropy assessment of rock cores.
  • To overcome limitations of traditional core holders for all-directional sonic logging.
  • To provide data for improved reservoir characterization and exploitation strategies.

Main Methods:

  • Developed a 3D measurement device based on the cross-hole sonic logging principle.
  • Integrated transducers, signal generator, oscillograph, omnidirectional positioning, and computer control.
  • Employed automated scanning of spherical rock samples to capture full-wave sonic data in all directions.

Main Results:

  • Successfully obtained full-wave sonic data in all directions for granite samples.
  • Calculated longitudinal and shear wave arrival times and velocities from waveforms.
  • Performed anisotropic physical characterizations based on derived wave velocities.

Conclusions:

  • The developed 3D device enables precise acoustic anisotropy measurement in rock cores.
  • Data generated is critical for guiding formation fracturing and borehole wall stability analysis.
  • This technology enhances reservoir characterization for unconventional oil and gas fields.