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Laura J Pyrak-Nolte1,2,3, William Braverman4, Nicholas J Nolte5

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Researchers developed "chattering dust" to image fluid flow in opaque rock fractures. This novel method uses acoustic signals from dissolving sugar grains to map fracture geometry and flow paths, offering a field-deployable solution.

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Area of Science:

  • Geosciences
  • Materials Science
  • Acoustics

Background:

  • Fluid flow through rock fractures is crucial for energy and environmental applications.
  • Direct imaging of subsurface fluid flow is challenging due to rock opacity.
  • Existing methods for tracing flow have limitations in data acquisition and path delineation.

Purpose of the Study:

  • To introduce and validate a novel method for imaging fluid flow within rock fractures.
  • To demonstrate the capability of chattering dust to map internal fracture geometry and flow paths.
  • To assess the advantages of chattering dust over conventional tracers and sensors.

Main Methods:

  • Development of chattering dust: sucrose grains with pressurized carbon dioxide pockets.
  • Deployment of chattering dust in laboratory-scale rock fracture models.
  • Detection of acoustic signals emitted by bursting CO2 pockets using external ultrasonic sensors.
  • Tracking dust particle movement to infer fracture characteristics and flow dynamics.

Main Results:

  • Chattering dust successfully delineated transport paths within complex fracture systems.
  • Acoustic signals provided real-time data on dust particle location and velocity.
  • Varying particle speeds correlated with local fracture apertures, revealing internal geometry.
  • The method distinguished flow paths and identified bottlenecks effectively.

Conclusions:

  • Chattering dust offers a non-invasive, real-time method for characterizing fluid flow in rock fractures.
  • This technique overcomes limitations of passive tracers and chemical sensors by actively delineating transport pathways.
  • The approach shows significant potential for scaling up to near-borehole applications in the energy and environmental sectors.