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Mapping Reservoir Changes Using 4D Seismic on the Norne G-segment, Norwegian Sea
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Petroleum Engineering and Applied Geophysics.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Time-lapse seismic can be an important tool for monitoring and planing further development of a producing hydrocarbon field. Use of 4D seismic can make it possible to detect production changes over a relatively large area and match these changes with production data acquired from wells. Undepleted pockets, pressure barriers and injectors out of range can be revealed when interpreting a 4D data set. This can be valuable information when updating reservoir models and when planing new wells an hence, lead to an increased recovery from the field. The reservoir interval and the oil column in the Norne G-segment are relatively thin. The pore pressure in the segment has been in the range of the bubble point of the hydrocarbons in place. This has led to gas going out of solution and back to oil again as a result of variations in pore pressure. The producer 6608/10-E-4 has extracted the hydrocarbons from the segment while injector 6608/10-F-4 has given pressure support to the producer by injection of water down flank in the water zone. Water has flushed oil as a result of the production of the hydrocarbons and injection of water. All this factors introduces more than one effect that may have affected the seismic response form the field at the same time, making the 4D interpretation in this segment challenging. In this Master?s thesis interpretation of pressure and saturation changes in the Norne G-segment have been performed for the time interval between 2001 and 2006. The work is done by use of amplitude difference data and AVO attributes on the seismic horizon representing top reservoir in addition to time shift analysis on a horizon below the reservoir. Seismic data from 2001, 2003, 2004 and 2006 and well information including paths, production and injection history has been available for this thesis.

Place, publisher, year, edition, pages
Institutt for petroleumsteknologi og anvendt geofysikk , 2013. , 87 p.
URN: urn:nbn:no:ntnu:diva-22458Local ID: ntnudaim:9729OAI: diva2:649702
Available from: 2013-09-19 Created: 2013-09-19 Last updated: 2013-09-19Bibliographically approved

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