Development of surface-wave monitoring system for leaked CO2 using a continuous and controlled seismic source

Tatsunori Ikeda, Takeshi Tsuji, Toshiki Watanabe, Koshun Yamaoka

研究成果: Contribution to journalArticle査読

7 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)94-105
ページ数12
ジャーナルInternational Journal of Greenhouse Gas Control
45
DOI
出版ステータス出版済み - 2 1 2016

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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