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E-335 - Microseismic: New Insights on Reservoirs

  • E&P geoscientists involved in reservoir characterization with no or weak experience in microseismic
  • To provide 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
  • To understand the basic concepts on which microseismicity relies on
  • To design, follow and supervise microseismic surveys to reliably achieving the intended objectives
  • To reduce risk by learning more about your evolving reservoir geomechanism during and after hydraulic fracturing and/or passive monitoring
  • It is highly recommended to have a good knowledge of fundamentals in seismic wave propagation, acquisition and processing, as well as in reservoir characterization
Ways and means
  • Interactive presentations, exercises, document analysis and videos

Fundamentals in microseismicity and microseismic waves
  • 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 and focal mechanism
  • 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 and processing
  • 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 and interpretation
  • 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