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2018 Vol.28, Issue 2 Preview Page

Research Article

Result of CO2 Geological Storage Site Survey for Small-scale Demonstration in Pohang Basin, Yeongil Bay, SE Korea

영일만 해상 포항분지 소규모 CO2 지중저장 실증을 위한 부지 탐사 결과

Shinn Young Jae1
,
Kwon Yi Kyun2
,
Yoon Jong-Ryeol3
,
Kim Byoung-Yeop1
,
Cheong Snons1*
신 영재1
,
권 이균2
,
윤 종렬3
,
김 병엽1
,
정 순홍1*
1Korea Institute of Geoscience and Mineral Resources
2Department of Geoenvironmental Sciences, Kongju National University
3TerraEG Co., Ltd.
1한국지질자원연구원
2국립공주대학교 지질환경과학과
3(주)테라이지
* 교신저자* Corresponding Author
30 June 2018. pp. 161-174
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Abstract

CO2 storage site for small-scale demonstration has been investigated in Yeongil Bay, Pohang, SE Korea, using seismic survey and exploration well data. We found a potential storage formation consisting mainly of conglomerate and sandstone. The storage formation unconformably overlies volcanic basement rocks that are located in a depth from 650 to 950 m (below sea level). The depth of the storage formation is suitable for injecting supercritical CO2 in the Pohang Basin. The average thickness of the storage formation is about 123 m, which possibly provides sufficient capacity at the level of small-scale storage demonstration. The overlying fine-grained deposits consist mainly of marine hemipelagic muds and interlayered turbidite sands. The overlying formation is considered as a good seal rock that is over 600 m thick and widely distributed in the onshore and offshore portions of the basin. NNE-trending faults found in the study area likely formed at basement level, probably not continue to seafloor. Such faults are interpreted as syndepositional faults involved to the basin initiation. This study reveals that the offshore area of the Pohang Basin contains deep geological formations suitable for small-scale CO2 storage demonstration.

Keywords
CO2 geological storage
small-scale demonstration
Pohang Basin
site characterization
seismic survey

소규모 이산화탄소 주입 실증 부지를 탐색하기 위해 포항분지 영일만 연안에서 취득한 탄성파 탐사와 시추 자료를 분석하였다. 연구지역에서 기반암은 해수면 기준 심도 650~950 m에 분포하며, 상부에 사암과 역암이 우세한 퇴적층이 발달한다. 이 퇴적층은 대부분 포항분지에서 이산화탄소가 초임계 상태로 존재할 수 있는 심도(약 740 m)보다 깊은 곳에 분포한다. 또한 평균 두께가 123 m로 저장능력이 양호할 것으로 여겨진다. 상부에 올라오는 이암층은 대개 600 m 이상 두껍고 육상과 해상의 포항분지에 광역적으로 분포하고 있어 덮개 능력이 양호할 것이다. 연구지역에 발달하는 북북동 방향의 단층들은 기반암 심도에서 주로 발달하는 퇴적동시성 단층으로 수직 연장성이 불량할 것으로 해석된다. 본 연구를 통해 영일만에 위치한 포항분지 심부에서 소규모 실증에 적합한 저장층과 덮개층이 분포하고 있음을 제시하였다.

키워드
이산화탄소 지중저장
소규모 실증
포항분지
부지 특성화
탄성파 탐사
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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 :2
  • Pages :161-174
  • Received Date : 2018-05-11
  • Revised Date : 2018-06-06
  • Accepted Date : 2018-06-11
  • DOI :https://doi.org/10.9720/kseg.2018.2.161
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