Geophysical monitoring of the Weyburn CO₂ flood: Results during 10 years of injection

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• 作者：D.J. White^a ; ^{don.white@nrcan.gc.ca} ; for the Weyburn Geophysical Monitoring Team¹
• 关键词：Seismic ; Microseismic ; Geophysics ; Resistitivy ; Inversion ; Monitoring
• 刊名：Energy Procedia
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：4
• 期：Complete
• 页码：3628-3635
• 全文大小：1439 K

文摘

CO₂ monitoring activities within the IEA GHG Weyburn-Midale CO₂ Monitoring and Storage Project have been ongoing since 2000. Time-lapse seismic data provide the primary geophysical monitoring tool supplemented by passive microseismic monitoring. Here, we highlight results from seismic monitoring and the analysis methods applied to these data. Formal inversion methods (both prestack seismic inversion and model-based stochastic inversion) are being applied to optimize the geological model used to predict the storage behaviour of the reservoir. Seismic amplitude versus offset and azimuth analysis has been applied to identify areas of the caprock that may contain vertical fractures. Injection-related deformation of the reservoir zone has been modelled using coupled fluid flow-geomechanical modeling constrained by the observed low levels of microseismicity. Finally, we present results from a feasibility study on the use of electrical resistivity tomography for CO₂ monitoring at Weyburn using existing steel well casings as electrodes.