Advanced surface-wave analysis for 3D ocean bottom cable data to detect localized heterogeneity in shallow geological formation of a CO2 storage site

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)107-118
ページ数12
ジャーナルInternational Journal of Greenhouse Gas Control
39
DOI
出版ステータス出版済み - 8 1 2015

All Science Journal Classification (ASJC) codes

  • 汚染
  • エネルギー(全般)
  • 産業および生産工学
  • 管理、モニタリング、政策と法律

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