Quantifying Time-lapse Seismic Signal Detection for the Otway Project Using Prestack Migration
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During Stage 2 of the Otway CCS Australian project it is planned to inject a small, up to 15,000 tonnes of gas, into a saline aquifer located at depth of 1500 m. In CO2 sequestration, the ability to detect CO2 plumes is one of the main purposes of using time-lapse seismic imaging. The detectability of CO2 in seismic time-lapse surveys relies on two main factors: a sufficiently strong signal and sufficiently small noise. Therefore, to model time-lapse seismic records, we need to model not only the seismic response of the geology and the plume but also the time-lapse noise. Because plume detection is determined by the S/N, the ability to model realistic time-lapse noise is crucial in any feasibility study. In this work, we propose a more realistic approach by adding band-limited random noise to the pre-stack data (shot gathers) to match the S/N of field data. Using these noisy gathers we then compare the detectability of CO2 plume by using pre- and post-stack Kirchhoff migrations.
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Alonaizi, Faisal; Pevzner, Roman; Bona, Andrej; Caspari, Eva; Gurevich, Boris; Alshamry, M. (2013)Time-lapse seismic analysis is utilized in CO2 geosequestration to verify the CO2 containment within a reservoir. A major risk associated with geosequestration is a possible leakage of CO2 from the storage formation into ...
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 ...
Pevzner, Roman; Galvin, R.; Madadi, Mahyar; Urosevic, Milovan; Caspari, Eva; Gurevich, Boris; Lumley, D.; Shulakova, V.; Cinar, Y.; Tcheverda, V. (2012)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 ...