Time-lapse Seismic Monitoring Technique for the Otway Site

Snons Cheong; Byoung-Yeop Kim

doi:10.32390/ksmer.2020.57.1.035

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2020 Vol.57, Issue 1 Preview Page Next Page

Research Paper

Time-lapse Seismic Monitoring Technique for the Otway Site 오트웨이 탄성파 자료의 시간경과 모니터링 기술연구

29 February 2020. pp. 35-44

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Abstract

This study demonstrates the use of a time-lapse seismic monitoring technique in the Otway project to measure CO₂ sequestration in a depleted gas reservoir (stage I) and in an aquifer (stage II), southern Australia. A total 15,000 t of CO₂ was injected in the Otway stage II, so that repetitive seismic surveys could be aimed at monitoring the behavior of the CO₂ in the aquifer by detecting the seismic amplitude anomalies. Subsurface seismic volumes were derived after applying various filters and verifying the seismic data, which mainly focuses on ground noise removal. The differences between seismic volumes before and after the CO₂ injection were shown by anomalies in the region. As the injection volume increased, the change in the RMS amplitude also gradually increased. The behavior of CO₂ in the storage layer was appropriately monitored. This study demonstrate the feasibility of detecting CO₂ using time-lapse seismic data.

Keywords

time-lapse

monitoring

seismic

Otway

지하 심부 퇴적층 (1단계 고갈가스전, 2단계 염대수층)에 이산화탄소 지중저장을 시험하는 호주 오트웨이 프로젝트에 참여하여 공동 연구를 수행하고, 취득된 시간경과 탄성파 탐사자료를 처리하였다. 지중저장 대상층에 주입된 이산화탄소는 1단계 65,000 t, 2단계 15,000 t 이며 지층 반사파의 진폭 변화를 탐지하기 위하여 3차원 육상탄성파 탐사를 반복 수행하였다. 염대수층에 대한 이산화탄소 지중저장 모니터링 기술을 확보하기 위하여 오트웨이 2단계 프로젝트의 시간경과 탄성파 자료를 확보하고 탄성파 반응 변화를 탐지하였다. 먼저 지표 굴림파 잡음 제거를 중심으로 육상탄성파자료 전산처리 흐름을 조합, 적용하여 지하구조 입체를 도출하였다. 그리고 이산화탄소 주입 전과 후 탐사시기별 3차원 탄성파 탐사결과들의 차이를 계산하여 주입구간 주변에서 진폭 이상대를 확인하였다. 연구결과 이산화탄소 주입량 증가에 따라 RMS 진폭의 변화가 확인되었고 저장층의 이산화탄소 거동을 적절히 모니터링하였다.

키워드

시간경과

모니터링

탄성파

오트웨이

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 57
No :1
Pages :35-44
Received Date : 2019-12-17
Revised Date : 2020-02-16
Accepted Date : 2020-02-21
DOI :https://doi.org/10.32390/ksmer.2020.57.1.035

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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