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dc.contributor.authorCaspari, Eva
dc.contributor.authorEnnis-King, J.
dc.contributor.authorPevzner, Roman
dc.contributor.authorGurevich, Boris
dc.contributor.editorCSIRO
dc.date.accessioned2017-01-30T13:57:13Z
dc.date.available2017-01-30T13:57:13Z
dc.date.created2013-03-27T20:00:58Z
dc.date.issued2012
dc.identifier.citationCaspari, Eva and Ennis-King, Jonathan and Pevzner, Roman and Gurevich, Boris. 2012. Prediction of the seismic time-lapse signal of CO2/CH4 injection into a depleted gas reservoir - Otway Project, in Proceedings of the 22nd International Geophysical Conference and Exhibition, Feb 26-29 2012. Brisbane, Australia: CSIRO.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/36709
dc.identifier.doi10.1071/ASEG2012ab302
dc.description.abstract

Stage I of the Otway project conducted by the Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC) in 2007-2010 included injection of 66000 tons of CO2-rich gas into a depleted gas reservoir at Naylor field, Otway Basin, Victoria. In this paper we present a seismic modelling study that estimates the time lapse response of CO2/CH4 injection into the Waarre C reservoir. Based on the static geological model, acoustic impedance inversion of the seismic baseline data as well as log data, two models with different levels of detail in the reservoir properties are built. The distribution of the injected CO2/CH4 mixture in the reservoir and the gas properties are obtained from flow simulations. In order to predict the change in acoustic impedance after injection, we employed the Gassmann fluid substitution workflow. The modelled total differences in acoustic impedance for different amounts of CO2/CH4 injected are of the same order of magnitude for both models and reflect the CO2 mass fractions predicted by flow simulations. Finally zero incidence synthetic data are computed for these cases using a statistical wavelet of the baseline data. The computed synthetics are compared to surface seismic and VSP monitoring data. The repeatability of the surface seismic data is too low to detect the predicted signal. For the 3D VSP data, the time-lapse signal/noise has a similar order of magnitude as the predicted signal. It may have the level required to detect the signal.

dc.publisherCSIRO
dc.subjecttime-lapse seismic
dc.subjectmodelling
dc.subjectCO2 Sequestration
dc.titlePrediction of the seismic time-lapse signal of CO2/CH4 injection into a depleted gas reservoir - Otway Project
dc.typeConference Paper
dcterms.source.volume2021
dcterms.source.issn0160-4619
dcterms.source.titlePrediction of the seismic time-lapse signal of CO2/CH4 injection into a depleted gas reservoir - Otway Project
dcterms.source.seriesPrediction of the seismic time-lapse signal of CO2/CH4 injection into a depleted gas reservoir - Otway Project
dcterms.source.conference22nd International Geophysical Conference and Exhibition,
dcterms.source.conference-start-dateFeb 26 2012
dcterms.source.conferencelocationBrisbane, Australia
dcterms.source.placeQLD
curtin.department
curtin.accessStatusOpen access via publisher


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