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Passive Seismic Tomography

 

During Geothermal or Hydrocarbon activities micro seismicity monitoring allows operators to establish a baseline for naturally occurring seismicity prior to the startup of injection activities, and then monitor over the life of the producing asset to demonstrate the safety of field operations to the public.

 

Compressional waves are sensitive to the fluid fill.

The ratio between the compressional and the shear wave velocity, Vp/Vs is a valid tool in identifying fluid type.

 

Passive Seismic Tomographic (PST) inversion is a method utilizing P and S-wave travel times from natural micro-earthquakes, to accurately estimate 3D Vp (structural) and Vp/Vs (lithologic) information of the subsurface and its potential.

 

Passive Seismic Tomography PST has been used in the past for seismological reasons on a different and certainly larger scale than that of hydrocarbon exploration. 

 

This geophysical technique is used today on a local scale to assist in the imaging of the subsurface volume in the region, in terms of hydrocarbon and geothermal exploration and/or delineation.

 

 

Passive Seismic Tomography – Key Advantages and Benefits

 

Seismicity is induced in or around a producing reservoir through the creation of new fractures or deformations of pre existing fracture.

 

Monitoring of microseismicity or acoustic emissions defines fault networks and help investigate strains associated with production, water flooding or stimulation.

 

Microseismic Monitoring

Long-term microseismic monitoring in hydrocarbon reservoirs has the potential to reveal fracture geometry

  

Passive Seismic Spectroscopy IPSS and Tomography PST operations

Explorations for hydrocarbon and geothermal purposes.