Network design and assessment

We design seismic monitoring systems in accordance with customer needs—and we conduct this in three steps:

  • Business requirement engineering
    • from in-depth examination of original customer motivations to their transcription into microseismic objectives
  • Geophysical modelling
    • simulation of wave propagation via our modelling software suite
    • design of pertinent geometrical sensor network
    • various scenarios are analysed and criteria-rated
  • Front-End engineering design
    • conception of a comprehensive, optimized monitoring system
    • considering local deployment constrains
    • identifying the appropriate equipment - software & hardware
    • designing the system architecture in terms of communication and data flow


	Microseismic sensitivity map


Decision support: Traffic Light System

We support customer needs by designing, setting up and operating traffic light systems (TLS).

Typically, real-time seismic monitoring will be used to operate a traffic-light warning protocol under which operations will be halted under predetermined conditions.

In case of threshold exceedance, audible and visual warnings are activated.

In parallel to the automatic processing, a qualified analyst is:

  • Quality controlling the automatic processing results
  • Reporting TLS status change and assessing the associated root causes


Advanced data processing

We perform advanced or exploratory processing techniques accounting for the context complexity, such as:

  • Advanced detection for low Signal-to-Noise ratio microseismic events
  • Advanced background noise analysis
  • Advanced processing techniques for microseismic event characterization—picking multiple wave arrivals, double-difference, moment tensor inversion (MTI), discrete fracture network (DFN) modelling...


Microseismic beach ball


Velocity model calibration

We assess and update existing velocity models to improve location accuracy.

  • Wide variety of models:
    • From simple layered to 3D with complex interfaces
    • Isotropic or anisotropic models (VTI, TTI)
    • Q factor fixed or inferred during the inversion process
  • Arbitrary network geometry (borehole, surface or hybrid)
  • Calibration strategy tailored to available inputs, e.g. based on the reduction of:
    • Relocation error of known sources (perforation shots, independently relocated strong events...)
    • Post-location time/polarization residuals (misfits) on an arbitrary number of wave arrivals
  • Possible joint inversion of velocity model and event locations
  • Use of concurrent calibration processes to look for model families of similar performances and assess uncertainty on model parameters


Cross-data analysis

We study multi-faceted data to better understand asset behavior.

  • Interpretation of site seismicity with respect to seismometers (existing local/regional/national networks)
  • Interpretation of site seismicity with respect to other data types (site production, geology, tectonics, petrophysics, geomechanics, statistical analysis, weather, subsidence, hydrologic)
  • Seismological data mining (catalogue & probabilistic geo-processing)
  • Analysis of seismic data along with contextual elements (e.g. existing faults) as well as production data if available


Cross-data analysis

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