TY - JOUR
T1 - Advanced surface-wave analysis for 3D ocean bottom cable data to detect localized heterogeneity in shallow geological formation of a CO2 storage site
AU - Ikeda, Tatsunori
AU - Tsuji, Takeshi
N1 - Funding Information:
We thank associate editor Charles Jenkins and two anonymous reviewers for constructive comments that improved the manuscript. We gratefully acknowledge the Ministry of Economy, Trade and Industry (METI) and the Japan CCS Co., Ltd. (JCCS); the seismic data used in this study was acquired under the project of JCCS commissioned by METI. This work is partially supported by and JST / JICA -SATREPS, and JSPS Grant-in-Aid for Scientific Research on Innovative Areas ( 15H01143 ). This work is further 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 - 2015/8/1
Y1 - 2015/8/1
N2 - To characterize heterogeneous geological formation with high-resolution, we propose a surface-wave analysis method for estimation of the spatial variation of S-wave velocity and attenuation coefficients. We applied the proposed method to the 3D ocean bottom cable (OBC) seismic data acquired at the Tomakomai CO2 storage site in Japan. By inversion of the observed dispersion curves of surface-wave (Scholte-wave in offshore survey), we successfully estimated the high-resolution pseudo-3D S-wave velocity structure for the shallow geological formation. We observed the dominant higher modes of the surface-wave, generated by the complex velocity structure such as inclusions of low-velocity layers. The interpretation based on the dispersion curves (or inverted S-wave velocities) and attenuation coefficients identified the lithological boundary in shallow formation across the 3D seismic survey area, but no fractures were detected. Our proposed method to estimate pseudo-3D S-wave velocity and attenuation structure can provide vital information for the CO2 geological storage, as it provides useful data for evaluation of CO2 leakage paths and estimation of permeability heterogeneity used in reservoir simulation. Moreover, it improves the accuracy of reflection seismic profile for deep structural analysis, and enhances estimations of lithology strength used for geomechanical modeling.
AB - To characterize heterogeneous geological formation with high-resolution, we propose a surface-wave analysis method for estimation of the spatial variation of S-wave velocity and attenuation coefficients. We applied the proposed method to the 3D ocean bottom cable (OBC) seismic data acquired at the Tomakomai CO2 storage site in Japan. By inversion of the observed dispersion curves of surface-wave (Scholte-wave in offshore survey), we successfully estimated the high-resolution pseudo-3D S-wave velocity structure for the shallow geological formation. We observed the dominant higher modes of the surface-wave, generated by the complex velocity structure such as inclusions of low-velocity layers. The interpretation based on the dispersion curves (or inverted S-wave velocities) and attenuation coefficients identified the lithological boundary in shallow formation across the 3D seismic survey area, but no fractures were detected. Our proposed method to estimate pseudo-3D S-wave velocity and attenuation structure can provide vital information for the CO2 geological storage, as it provides useful data for evaluation of CO2 leakage paths and estimation of permeability heterogeneity used in reservoir simulation. Moreover, it improves the accuracy of reflection seismic profile for deep structural analysis, and enhances estimations of lithology strength used for geomechanical modeling.
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U2 - 10.1016/j.ijggc.2015.04.020
DO - 10.1016/j.ijggc.2015.04.020
M3 - Article
AN - SCOPUS:84929578888
VL - 39
SP - 107
EP - 118
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
SN - 1750-5836
ER -