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Research Article

Detection of Potential Flow Paths of Leaked CO2 from Underground Storage Using Electrical Resistivity Survey

전기비저항탐사 방법에 의한 지중 저장 이산화탄소 누출 가능 경로 탐지

Woo-Ri Lim1
,
Se-Yeong Hamm1*
,
Hak-Soo Hwang2
,
Sung-Wook Kim3
,
Hang-Tak Jeon1
임 우리1
,
함 세영1*
,
황 학수2
,
김 성욱3
,
전 항탁1
1Department of Geological Sciences, Pusan National University
2Tomory Co., Ltd.
3GI Co., Ltd.
1부산대학교 지질환경과학과
2(주)토모리
3(주)지아이
* 교신저자* Corresponding Author
March 2018. pp. 69-79
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Abstract

The Korean government attempts to reduce CO2 emissions by 37% to 314.7 Mt CO2, down from the estimated 850.6 Mt CO2 until 2030 in order to confront green house effect. In this context, in 2014, Korean government launched CO2 Storage Environmental Management Research (K-COSEM) Center for carrying out pilot-scale research on CO2 leakage from underground CO2 storage facilities. For the detection of CO2 leakage, it is necessary to identify hydrologeological and geophysical characteristics of the subject area. In the study site of Naesan-ri, Daeso-myeon, Eumseong-gun, Chungbuk Province, two times injection tests (June 28-July 24, 2017 and August 07-September 11, 2017) of CO2 and SF6 dissolved waters, respectively, was conducted to understand the leakage behavior of CO2 from underground. The injection well was drilled to a depth of 24 m with a 21-m casing and screen interval of 21~24 m depth. Two times resistivity surveys on August 18, 2017 and September 1, 2017, were conducted for revealing the flow of the injected water as well as the electrical properties of the study site. The study results have shown that the high-resistivity zone and the low-resistivity zone are clearly contrasted with each other and the flow direction of the injected water is similar to natural groundwater flow. Besides, the low resistivity zone is widely formed from the depth of injection to the shallow topsoil, indicating that the weathered zone of high permeability has high CO2 leakage potential.

Keywords
carbon capture and storage (CCS)
CO2 leakage
electrical resistivity survey
hydrogeological characteristics
green house effect

한국 정부는 온실효과에 대응하기 위해서 이산화탄소 배출을 850.6 Mt에서 2030년까지 314.7 Mt (37%)로 감축하기로 하였다. 이러한 상황에서, 한국 정부는 이산화탄소 지중저장시설로부터 누출되는 이산화탄소를 시함부지 규모로 연구하기 위하여 2014년에 이산화탄소 지중저장 환경관리연구단(K-COSEM)을 발족하였다. 이산화탄소의 누출을 탐지하기 위해서는 대산지역의 수리지질학적, 지구물리학적 특성을 규명하는 것이 필요하다. 본 연구에서는, 충북 음성군 대소면 내산리의 연구부지에서 2017년 6월 28일부터 7월 24일과 8월 7일부터 9월 11일까지 두 차례에 걸쳐서 각각 CO2와 SF6를 용해시킨 물을 지하에 주입하여 지하에서의 이산화탄소 누출 거동을 알아내고자 하였다. 주입정은 심도 24 m, 케이싱은 21 m까지, 스크린 구간은 심도 21~24 m 구간이다. 2017년 8월 18일과 9월 1일의 두차례 전기비저항탐사로 주입수의 흐름과 전기비저항 특성을 파악하고자 하였다. 연구 결과에 의하면, 고 전기비저항대와 저 전기비저항대가 뚜렷하게 구별되며, 주입수의 유동방향은 자연상태의 지하수 흐름과 비슷하게 나타났다. 또한 저 전기비저항대는 주입심도로부터 천부 표토층까지 광범위하게 형성되며, 이는 높은 투수성을 가지는 풍화대가 이산화탄소 누출 가능성이 높다는 것을 지시한다.

키워드
이산화탄소 포집 및 저장
CO2 누출
전기비저항탐사
수리지질 특성
온실효과
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 28
  • No :1
  • Pages :69-79
  • Received Date : 2018-02-19
  • Revised Date : 2018-03-15
  • Accepted Date : 2018-03-20
  • DOI :https://doi.org/10.9720/kseg.2018.1.069
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