Seabed Subsidence Monitoring at Snorre with PRM Inclinometer Measurements
M. Houbiers, R. Macault, T. Røste and M. Thompson
Event name: 78th EAGE Conference and Exhibition 2016
Session: Permanent Reservoir Monitoring
Publication date: 31 May 2016
Info: Extended abstract, PDF ( 1.87Mb )
Price: € 20
Geophysical reservoir monitoring (GRM) is important for optimizing field management. Along with traditional GRM methods, monitoring of seabed subsidence might provide additional insight in what is going on in the reservoir and the overburden over time, both from a production optimization as well as from a health, safety, and environmental point of view. We propose a method for monitoring seabed subsidence using inclinometer measurements acquired with a PRM system. The method is applied to passive PRM data acquired at Snorre between May and November 2015, resulting in a qualitative map of seabed subsidence. The method requires that the PRM sensors only move due to subsidence. However, the Snorre PRM system is installed in 2013-2014 and natural backfill of the trenches is expected to be ongoing for some time after the sensors are deployed in the seabed. Yet we believe that the method can be used for monitoring seabed subsidence when the sensors have stabilized, and inclination measurements are acquired frequently and regularly over time.