Microseismic Services

Graph of Microseismic Event Densities from 3 Stimulations

Data courtesy of EEIG

Semore Seismic has developed a unique range of borehole receivers and software specifically for microseismic monitoring. The processing package, Divine, incorporates all the functions necessary to perform real time automatic and manual processing as well as specialised tomographic and migration functions to image data from microseismic events.

The package is interactive and has a common database so a number of operators can work on the data simultaneously. The specialised microseismic receivers have been designed to cover the range of temperature and pressure ratings required for high resolution networks and are designed to have very long service intervals to minimise network interruptions.


Semore's services can be taken as a complete package or may be provided individually. In particular, for long term monitoring, it is recognised that it is often more efficient for the client to operate the system and process the data locally. This approach is supported through practical training in operating the tools and data acquisition system as well as on-going software maintenance and interpretation support.

Data Acquisition

  • Real time monitoring
  • Bootstrap automatic location
  • On site/off site processing
  • Network design and installation
  • Velocity model building
  • Resolution analysis
  • Training

Data Processing

  • Hypocentre locations
  • Seismic moment and moment magnitude
  • 3D wavefield migration
  • 3D tomography
  • Interactive 3D displays and movies
  • Time lapse displays

Applications

  • Fracture stimulation monitoring
  • Whole field monitoring
  • Production monitoring
  • Drilling induced seismicity/borehole stability
  • Waste re-injection monitoring
  • Rockburst detection

Engineering Borehole Seismic and Tomographic Imaging Services

Photo of field: Crosshole Tomography Survey Data Acquisition

Standard crosshole and surface to borehole engineering seismic surveys for site investigation. Semore possesses unique extended depth tools to acquire crosshole tomography surveys at up to 250m depth. Data acquisition is performed according to ASTM / ISRM recommended methods.

Quality control during data acquisition and processing is ensured by a qualified geophysicist. Real time trace displays are continuously available in the field and are used to monitor the signal to noise ratio of the traces and perform consistency checks between shots. The data are further checked at appropriate intervals to ensure they are adequate for the required interpretation. These checks may involve partial processing of representative portions of the data either in the field or by electronically sending the data to the office.

Data Acquisition

  • 3D/2D crosshole tomography surveys
  • Uphole and downhole shooting for P, SH and SV
  • Survey design and consultancy
  • Model based resolution analysis of tomographic surveys

Data Processing

  • P, SV and SH wave velocities
  • Derivation of elastic parameters, Poissons ratio, Bulk modulus and Shear Modulus
  • Tomographic velocity imaging
  • Pre-stack depth migration wavefield imaging
  • Identification of borehole intersections of flowing fractures and relative fracture openings from Tube wave data
  • Interactive 3D image displays

Applications

  • Derivation of dynamic elastic parameters
  • Geological mapping
  • Cavity detection
  • Mineral exploration
  • Fracture and fault imaging
  • Time lapse monitoring of remedial works