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Geophysical Monitoring of CO2 Injection in Saline Aquifers

Grude, Sissel
Doctoral thesis
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URI
http://hdl.handle.net/11250/280193
Date
2014
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  • Institutt for geovitenskap og petroleum [1838]
Abstract
Carbon capture and storage (CCS) is a prerequisite to meet the internationally agreed

upon target of limiting the emissions of CO2. The international energy agency has a goal

that CCS should cover 14% of the CO2 emission reduction within 2050. Saline aquifers

and depleted oil- and gas reservoirs are of particular interest as storage sites. The

capacity and injectivity of the saline aquifers are crucial success factors for CO2 storage.

Fluid saturation, pore pressure and geomechanical changes are the most frequent

observed variations in reservoir parameters caused by CO2 injection. Monitoring is

essential to ensure safe storage and detect possible leakage of injected CO2. Time-lapse

seismic data is an important monitoring tool. Pore pressure variation is expected to

interfere with the CO2 fluid substitution on the time-lapse seismic for semi-closed

reservoirs.

The aim of this thesis is to study time-lapse seismic monitoring of pressure and

saturation changes caused by CO2 injection in a saline aquifer. Field data from the

Tubåen Fm. at the Snøhvit field is used in the analysis. Time-lapse seismic data is

combined with laboratory measurements, reservoir flow analysis, rock physics analysis,

synthetic seismograms and well-log analysis to estimate the changes in pressure and

fluid saturation caused by CO2 injection. This thesis consists of four main papers in

addition to two papers in appendixes.
Publisher
NTNU
Series
Doctoral thesis at NTNU;2014:267

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