Microseismic Services

Graph of Microseismic Event Densities from 3 Stimulations

Data courtesy of EEIG

Semore's services can be taken as a complete package or may be provided individually. In particular, for long term monitoring, 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 Divine as well as on-going software maintenance and interpretation support.

Semore Seismic has developed a unique software package, Divine, specifically for microseismic monitoring and processing. This provides the basis for a flexible and rapid service tailored to the particular features of each application. In particular the software supports 3D dipping layers and 3D Thomsen TTI velocity models that are commonly required for frac monitoring in Shales and data can be processed from any combination of vertical, horizontal or inclined wells and near surface networks.

Divine also incorporates a proprietary and patented realtime automatic event location technique referred to as Bootstrap. The method is highly reliable and can also be applied to identifying triggers in low signal to noise trace data. Pre survey resolution and sensitivity modelling and post acquisition processing of event clusters and microseismic reflection migration further enhance the imaging potential from microseismic data.


Data Acquisition

  • Real time monitoring
  • Bootstrap automatic location
  • Multi-well data acquisition time syncing and processing
  • Network design
  • Velocity model building
  • Resolution and sensitivity analysis
  • Training

Data Processing

  • Hypocentre locations
  • 3D plane layer modelling
  • 3D TTI Thomsen anisotropy
  • Moment magnitude
  • 3D wavefield migration
  • 3D tomography
  • Interactive 3D displays and movies
  • Time lapse displays

Applications

  • Fracture stimulation monitoring
  • Near surface 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