5 days RES/MICROSEIS
- 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.
- 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.