물리탐사를 이용한 이산화탄소 지중저장 모니터링의 국외 사례 분석
A Review of CO2 Storage Monitoring Based on Geophysical Methods
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참고문헌
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초록
최근 들어 이산화탄소를 줄이기 위한 효과적인 방법으로 이산화탄소 지중저장 기술이 주목 받고 있다. 지중저장된 이산화탄소의 거동을 파악하고 환경에 대한 영향 및 안정성을 평가하기 위해서는 지속적인 모니터링이 필요하며, 효과적인 모니터링을 위해 저장지 특성에 맞는 최적의 모니터링 방법을 선택하는 것이 중요하다. 본 연구에서는 대표적인 이산화탄소 지중저장 프로젝트인 슬라이프너, 웨이번, 로스트 힐, 웨스트 펄 퀸, 나가오카, 인살라, 프리오, 오트웨이, 케진 등의 사업에서 적용된 모니터링 프로그램에 대해 살펴보았다. 이들 모니터링 프로그램을 조사한 결과 일반적으로 시간 경과 탄성파탐사가 가장 많이 이용되었는데 저장지 특성에 따라 3차원 탄성파탐사와 시추공-시추공 탄성파 토모그래피 및 수직 탄성파탐사가 수행되기도 하였다. 이외에도 중력탐사, 인공위성탐사, 레이다탐사, 전기비저항 토모그래피 및 전자탐사 등이 수행되었다. 해외 사례를 분석해 본 결과 효과적인 모니터링을 위해 저장지 특성에 따라 각기 다른 종류의 물리탐사 방법들이 이용되고 있음을 확인할 수 있었다. 본 연구에서 수행된 국외 사례분석은 추후 우리나라 지중 후보지가 선정되었을 때 최적의 모니터링 기법을 검토하는데 활용될 수 있을 것으로 기대된다.
Abstract
Carbon Capture and Storage (CCS) is considered to be one of the most effective methods to remove CO2 from the atmosphere. To understand the behavior of CO2 underground and assess its stability and safety, CO2 storage site should be monitored periodically. To properly monitor the behavior of CO2, it is important to choose appropriate monitoring techniques for the properties of storage sites. In this paper, we review what kinds of geophysical methods have been used to monitor CO2 storage sites abroad. We introduce monitoring programs for Sleipner, Weyburn, Lost Hills, West Pearl Queen, Nagaoka, In Salah, Frio, Otway, and Ketzin. In most cases, time-lapse seismic methods have been applied. Gravity, satellite airborne radar interferometry (InSAR), ground penetrating radar (GPR), electrical resistivity tomography, and electromagnetic imaging methods have also been used for CO2 monitoring. From these case histories, we note that it is very important to choose proper geophysical methods to effectively monitor the behavior of CO2 at the storage site. We hope that this review paper will contribute to determining which methods are appropriate to monitor Korean CO2 storage site in the near future.
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