| 講演要旨(和文) | | 経済産業省（2018年度からは国立研究開発法人 新エネルギー・産業技術総合開発機構）が日本CCS調査株式会社に委託して実施している苫小牧CCS実証試験事業では，圧入した二酸化炭素の挙動や分布状況を把握することを目的として，繰り返し弾性波探査を計画し，実施している．2016年4月の二酸化炭素圧入開始以降，2回のモニター調査を実施し，圧入前のベースライン調査記録を用いたタイムラプス処理の結果，二酸化炭素圧入に伴う4Dレスポンスを検出した．本報告では，本実証試験事業における繰り返し弾性波探査計画，過去2回のモニター調査のデータ取得概要およびタイムラプス処理結果を紹介する． |
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| | 講演要旨(英文) | | As part of the Tomakomai CCS demonstration project, JCCS, commissioned from METI, planned and have been conducting 4D seismic surveys. From the beginning of the injection to date, two monitoring surveys have been completed. The first pass was in January to February 2017 and the second pass was in July to August 2017. Time-lapse processing for the second pass which was conducted at approximately 70,000 tons of cumulative injection volume shows a clear 4D response in the vicinity of the injection point. The 4D response is consistent with the injection well trajectory and with the reservoir model derived from pressure analysis based on the injection history. In Tomakomai area, 4D seismic survey data has a great potential to help understanding CO2 plume distribution, migration, and the reservoir characteristics. |
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