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This study introduces a new Seismic While Drilling (SWD) processing workflow using Distributed Acoustic Sensing (DAS) data. The method successfully recovers subsurface velocity and structural information without pilot signals, simplifying passive seismic deployment.

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Area of Science:

  • Geophysics
  • Seismology
  • Petroleum Geoscience

Background:

  • Conventional Seismic While Drilling (SWD) relies on measured drill bit signatures for processing passive seismic data.
  • Acquiring pilot signals is crucial for correlating passive seismic recordings and determining source trigger times in traditional SWD.
  • Challenges arise in SWD processing when pilot signals are unavailable, necessitating inference of source timing and signature from recorded wavefields.

Purpose of the Study:

  • To present an advanced processing workflow for Distributed Acoustic Sensing (DAS) based SWD data acquired without pilot signals.
  • To transform passive SWD data into active seismic equivalents for simplified subsurface characterization.
  • To demonstrate the recovery of reliable velocity and structural information from DAS-based SWD data in a cross-well setting.

Main Methods:

  • Developed a processing workflow guided by travel time and seismic modeling.
  • Transformed passive SWD data into active seismic data equivalents.
  • Applied travel time tomography and cross-well imaging to the transformed data.

Main Results:

  • Successfully processed a SWD dataset acquired with DAS in a cross-well setting without pilot signals.
  • Demonstrated the ability to infer source timing and signature from the recorded wavefield.
  • Recovered reliable velocity and structural information from the DAS-based SWD data.

Conclusions:

  • The presented workflow enables simplified and scalable deployment of passive seismic while-drilling workflows.
  • Reliable subsurface velocity and structural information can be obtained from DAS-based SWD data even without pilot measurements.
  • The method facilitates advanced subsurface characterization using passive seismic data acquired during drilling operations.