Applications of Non-linear Elastic Wavefield Inversion for 4D Seismic Data to Characterize the Injected Carbon Dioxide文档.pdf

Available online at Energy Procedia 37 ( 2013 ) 4249 – 4256 GHGT-11 Applications of non-linear elastic wavefield inversion for 4D seismic data to characterize the injected carbon dioxide Akio Sakai* Japan Petroleum Exploration Co., Ltd.(Japex), 1-7-12 Marunouchi, Chiyoda-ku, Tokyo 100-0005 Japan Abstract Elastic parameters are fundamental in estimating rock properties, fluid saturation and pore pressure in carbon dioxide injection and 4D seismic survey efficiently provides spatial changes of elastic parameters as well as baseline parameters. Conversely elastic parameters are governed by microstructures of material and dynamic conditions of measurement and thus depend on the temporal and spatial scale. Logging data were useful in estimating elastic properties at 10-50kHz time scale, and under partially saturation condition they could be taken into seismic time scale at saturation rate estimated by “partially Patchy saturation model” currently proposed and evidenced in good matching with logging data analysis, which took residual water saturation into account and adapted for building elastic wave velocities in 3D monitor seismic cube. 4D seismic survey data, acquired by Japex in 2003 and 2005 on the area of onshore RITE/METI carbon dioxide injection test site, were analysed incorporated with repeated time-lapse logging data