Feasibility of CO2 plume detection using 4D seismic: CO2CRC Otway Project case study - Part 2: Detectability analysis
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A key objective of stage 2 of the Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC) Otway Project is to explore the ability of the seismic reflection method to detect and monitor injection of a small amount of greenhouse gas into a saline formation. Development of a seismic monitoring program requires an understanding of expected time-lapse (TL) seismic signals. Hence, before such an injection experiment is undertaken, we assessed the feasibility of seismic monitoring in a modeling study. Considering realistic gas distributions inferred from reservoir simulations, we analyzed the influence of various factors (injection volume, time after injection, and realizations of the reservoir flow model) on the TL seismic signal. However, the applicability of seismic monitoring depends not only on the strength of the TL seismic signal but also on the noise level of the seismic data. Hence, to estimate the detectability of gas in the subsurface, we have developed a workflow that integrated actual data repeatability observed at the Otway test site into the seismic feasibility study. Although we observed differences between the considered scenarios, all of the scenarios indicated a high likelihood of successful plume detection with the observed noise level and surface 4D seismic acquisition geometry used in stage 1 of the CO2CRC Otway Project at the same site. However, a thin layer of gas spreading out from the edges of the main plume below the seal in all scenarios would be a challenge for surface seismic monitoring.
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Wisman, Putri Sari (2012)The CO2CRC Otway Project aims to demonstrate that CO2 can be safely stored in a depleted gas field and that an appropriate monitoring strategy can be deployed to verify its containment. The project commenced in 2005, with ...
Feasibility of time-lapse seismic methodology for monitoring the injection of small quantities of CO2 into a saline formation, CO2CRC Otway ProjectPevzner, Roman; Urosevic, Milovan; Caspari, Eva; Galvin, R.; Madadi, M.; Dance, T.; Shulakova, V.; Gurevich, Boris; Tcheverda, V.; Cinar, Y. (2013)A key objective of Stage 2 of the CO2CRC Otway Project is to explore the ability of geophysical methods to detect and monitor injection of greenhouse gas into a saline formation. For this purpose, injection of some 10,000 ...
Active surface and borehole seismic monitoring of a small supercritical CO2 injection into the subsurface: experience from the CO2CRC Otway ProjectPevzner, Roman ; Urosevic, Milovan ; Tertyshnikov, Konstantin ; AlNasser, Hussain; Caspari, Eva; Correa, Julia; Daley, Tom; Dance, Tess; Freifeld, Barry; Glubokovskikh, Stanislav ; others (2020)Time-lapse (TL) (4D) seismic monitoring of injected CO2 in geological formations is being increasingly employed as the principal method for ensuring containment of CO2 and testing conformance of predicted plume behavior. ...