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A Novel Approach for Cost Effective PRM Seismic Operations at SnorreNormal access

Authors: M. Thompson, A.S. Pedersen, M. Andersen and S.M. Skogland
Event name: 78th EAGE Conference and Exhibition 2016
Session: Timelapse Acquisition and Processing
Publication date: 31 May 2016
DOI: 10.3997/2214-4609.201600586
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.35Mb )
Price: € 20

Summary:
The Snorre Permanent Reservoir Monitoring system has a receiver area encompassing approximately 200 km2, and aims to monitor, seismically, the reservoir twice a year; through autumn and spring seismic campaigns. In order to acquire two seismic surveys during a single seismic season in the North Sea, while still maintaining enough separation in time to allow for monitoring of the production effects in the reservoir requires consideration of a novel technique to ensure that both surveys are effectively acquired. Since the seismic sensors are stable from one survey to another, and in the case of no production effects outside the receiver area, shots from outside the receiver area can be borrowed from earlier surveys and used to pad out the repeated surveys during the processing of the seismic. This enables a managed reduction in the annual source effort, while ensuring good time-lapse data quality, and contributes to acquisition of two monitoring surveys per year.


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