Proper Reservoir Monitoring!
Sunday, March 25, 2012
Our March 21st Forum covered a range of exciting new innovations, from 'broadband' 3D offshore to the introduction of ideas from medical imaging into interpretation.
However, the clearest theme to emerge was that PRM - Permanent Reservoir Monitoring - is absolutely key to understanding the dynamics of oil and gas reservoirs.
Some key points are:
•interpretation of time-lapse/4D seismic is currently 'phenomenological' that is, we see changes over time that seem to be linked to production but we don't understand the rocks well enough to say why or how.
•new reservoir engineering observations can only be understood if rocks contain aligned micro-cracks and fractures, at high densities, dilating and expanding as reservoir pressures alter, and capable of rapid change.
•P wave reflectivity poorly characterises such rocks; shear waves (and P wave velocities) do a much better job: this leads to the conclusion that geophysical reservoir monitoring requires 3 component, and frequent, measurement.
•fibre optics have great potential for PRM systems.
One might say PRM = Proper Reservoir Monitoring!