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Time-lapse Seismic Reservoir Characterization Used for Reservoir Model Update of a Mature Chalk Field - The South Arne CaNormal access

Authors: O.V. Vejbaek, M.K. Rosengreen, V. Volkov, R. Lamb, A.F. Jakobsen and H.J. Hansen
Event name: 76th EAGE Conference and Exhibition 2014
Session: 4D Seismic in Reservoir Simulation - Closing the Loop
Publication date: 16 June 2014
DOI: 10.3997/2214-4609.20141148
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.75Mb )
Price: € 20

Summary:
The use of time-lapse seismic data has changed reservoir management of the South Arne field, where an increasing volume of marginal reserves are being targeted. This paper describes the use of the time-lapse seismic data in a physical context, where estimated time-lapse time-shifts are used for reservoir compaction estimation and its impact on the reservoir modelling. The time-lapse amplitude changes are inverted for change in acoustic impedance and vp/vs ratio. A reservoir state dependent rock physics model enables an estimation of saturation changes, which contains detailed information about the water sweep; information which is not present in neither seismic NRMS maps nor in the initial reservoir model.


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