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E-251 - Microseismic: New Insights on Reservoirs

  • Geoscientists involved in reservoir characterization with no or weak experience in microseismic.
  • It is highly recommended to have a good knowledge of fundamentals in seismic wave propagation, acquisition and processing, as well as in reservoir characterization.
  • This course provides an understanding of microseismic data acquisition and processing.
  • To give a quicklook method based on simple tools available to analyze and interpret microseismic data, acquired in different situations like passive monitoring or hydraulic fracturing of reservoirs.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • explain the basic concepts on which microseismicity relies on,
  • design, follow and supervise microseismic surveys to reliably achieving the intended objectives,
  • reduce risk by identifying the evolving reservoir geomechanism during and after hydraulic fracturing and/or passive monitoring.
  • No prerequisites for this course.
Ways and means
  • Interactive presentations, exercises, document analysis and videos.

Fundamentals in microseismicity & microseismic waves 1.5 days
  • Introduction - Origin and principle of microseismicity.
  • Terminology and basic principles.
  • Recall on mechanics and rock physics.
  • Natural source - Features.
  • Natural seismic sources representation.
  • Seismic moment tensor.
  • Time of rupture and seismic moments.
  • Propagation of microseismic waves.
  • Equation of propagation from microseismic sources.
  • Propagation of seismic waves induced by failures.
  • Complex medium.
Radiation pattern & focal mechanism 1 day
  • Radiation pattern.
  • Radiation pattern of faulting source.
  • Fairfield radiation pattern of typical natural seismic sources.
  • Focal mechanism.
  • Focal mechanism - Graphical representation.
  • Focal mechanism of typical natural seismic sources.
Acquisition & processing 1 day
  • Acquisition and data processing.
  • Acquisition - Equipment - Typical receiver deployment techniques.
  • Preparation & supervision.
  • Processing – Microseismic event localization.
  • P and S-wave picking.
  • Velocity model and uncertainty.
  • Methods of locating by back propagation.
Application & interpretation 1.5 days
  • Access to parameters associated with fractures.
  • Quantification of the seismic moment tensor.
  • Moment tensor inversion process.
  • Synthetic and field study.
  • Application and interpretation.
  • Passive monitoring.
  • Fluid injection - Hydrofracturation.
  • Case studies and exercises.
  • Discussion and conclusions.