TY - JOUR
T1 - Development of surface-wave monitoring system for leaked CO2 using a continuous and controlled seismic source
AU - Ikeda, Tatsunori
AU - Tsuji, Takeshi
AU - Watanabe, Toshiki
AU - Yamaoka, Koshun
N1 - Funding Information:
We thank associate editor Charles Jenkins and two anonymous reviewers for constructive comments that improved the manuscript. We also thank Y. Maeda, K. Matsuhiro, T. Watabe at Nagoya University and R. Ikuta at Shizuoka University for their help in ACROSS data acquisition. This study was supported by JSPS through a Grant-in-Aid for Scientific Research on Innovative Areas (no. 15H01143 ) and Bilateral Joint Research Projects with MOSR, and JICA/JST through SATREPS project. This work was supported by the International Institute for Carbon-Neutral Energy Research , sponsored by the World Premier International Research Center Initiative, MEXT, Japan.
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - To detect CO2 leakage from CO2 geological storage, we describe a seismic monitoring method using a continuous and controlled seismic source system, the Accurately Controlled Routinely Operated Signal System (ACROSS). The method applies surface-wave analysis to monitor the shallow subsurface from the temporal-variation (time-variation) of surface-wave phase velocity. Our numerical simulation study for CO2 leakage through fault zones indicated that the spatial distribution of leaked CO2 can be estimated from small temporal-variation of local phase velocities (~1-3%). To demonstrate the method in a field case, we analyzed continuous seismic records acquired with ACROSS. We clearly extracted a dispersion curve of surface waves in the frequency range excited by the ACROSS (5.015-15.015 Hz). In particular, we obtained reliable estimates of phase velocities in 10-15Hz frequency range, in which the time-variation of phase velocities was better than 1% accuracy. This temporal stability was sufficient to allow us to detect changes in phase velocities associated with CO2 leakage before leaked CO2 reached the surface.
AB - To detect CO2 leakage from CO2 geological storage, we describe a seismic monitoring method using a continuous and controlled seismic source system, the Accurately Controlled Routinely Operated Signal System (ACROSS). The method applies surface-wave analysis to monitor the shallow subsurface from the temporal-variation (time-variation) of surface-wave phase velocity. Our numerical simulation study for CO2 leakage through fault zones indicated that the spatial distribution of leaked CO2 can be estimated from small temporal-variation of local phase velocities (~1-3%). To demonstrate the method in a field case, we analyzed continuous seismic records acquired with ACROSS. We clearly extracted a dispersion curve of surface waves in the frequency range excited by the ACROSS (5.015-15.015 Hz). In particular, we obtained reliable estimates of phase velocities in 10-15Hz frequency range, in which the time-variation of phase velocities was better than 1% accuracy. This temporal stability was sufficient to allow us to detect changes in phase velocities associated with CO2 leakage before leaked CO2 reached the surface.
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U2 - 10.1016/j.ijggc.2015.11.030
DO - 10.1016/j.ijggc.2015.11.030
M3 - Article
AN - SCOPUS:84951299683
VL - 45
SP - 94
EP - 105
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
SN - 1750-5836
ER -