Determining changes in CO2 saturation from time-lapse measurements using ghost reflections retrieved by seismic interferometry
conference paper
One of the targets of time-lapse seismic monitoring of CO2 sequestration is to determine the parts of the reservoir reached by the injected CO2 and to estimate their saturation. Such information could be extracted from the time-lapse measurement using AVO or impedance information. But non-repeatability of the source positions and time-lapse changes in the overburden could lower the accuracy of the estimation of saturation. We propose the utilization of non-physical (ghost) reflections retrieved by seismic interferometry to estimate the CO2 saturation inside the reservoir. We use the ghost reflections to directly estimate the layer specific velocities inside the reservoir and the cap rock and thus eliminate the two mentioned causes of inaccuracies. We apply this idea and demonstrate its
added value and potential using numerically modelled data for a simplified model based on the Sleipner underground storage site in the North Sea.
added value and potential using numerically modelled data for a simplified model based on the Sleipner underground storage site in the North Sea.
Topics
TNO Identifier
762717
ISSN
10523812
Publisher
Society of Exploration Geophysicists
Source title
SEG Houston 2013 Annual Meeting, SEG 2013. 22 September 2011 through 27 September 2011
Pages
5004-5009
Files
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