Microseismic reservoir monitoring

Over a number of years it has also been shown that permanent microseismic monitoring (or "passive listening") has the potential to provide valuable time-lapse 3D seismic (ie 4D seismic) information on the longer-term hydraulic and geomechanical processes taking place within a reservoir. In other words microseismicity has considerable potential for permanent 4D seismic reservoir monitoring and contribution to reservoir management processes.

These processes include the distribution of fluid flow and pressure fronts within naturally fractured systems, production related compaction and the re-activation of faults.

Illustrations of this come from;

Ekofisk field, Offshore Norway: Reservoir microseismicity at the Ekofisk oil field

Valhall field, Offshore Norway: Microseismic survey of a North Sea reservoir

Ekofisk field, Offshore Norway: Microseismic Logging of the Ekofisk Reservoir

With the advent of enhanced permanent reservoir monitoring systems (eg intelligent wells, fibre optics, MEM's sensors) microseismic monitoring has become a practicable means of time-lapse seismic imaging of hydrocarbon reservoir processes remote from production/injection boreholes.


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