Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Seismic Imaging of Ocean-bottom Seismic Data for Finding a Carbon Capture and Storage Site: Two-dimensional Reverse-time Migration of Ocean-bottom Seismic Data Acquired in the Pohang Basin, South Korea

이산화탄소 지중저장 부지 선정을 위한 해저면 탄성파 탐사자료의 영상화: 포항 영일만 해저면 탐사자료의 2차원 역시간 구조보정

  • Park, Sea-Eun (Department of Mineral Resources and Energy Engineering, Jeonbuk National University) ;
  • Li, Xiangyue (Research Institute of Energy and Resources, Seoul National University) ;
  • Kim, Byoung Yeop (Petroleum and Marine Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Oh, Ju-Won (Department of Mineral Resources and Energy Engineering, Jeonbuk National University) ;
  • Min, Dong-Joo (Department of Energy Systems Engineering, Seoul National University) ;
  • Kim, Hyoung-Soo (Department of Electrical and Electronic Engineering, Jungwon University)
  • 박세은 (전북대학교 자원.에너지공학과) ;
  • 이향월 (서울대학교 에너지자원신기술연구소) ;
  • 김병엽 (한국지질자원연구원 석유해저연구본부) ;
  • 오주원 (전북대학교 자원.에너지공학과) ;
  • 민동주 (서울대학교 에너지자원공학과) ;
  • 김형수 (중원대학교 전기전자공학과)
  • Received : 2021.07.14
  • Accepted : 2021.08.23
  • Published : 2021.08.31
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Abstract

Owing to the abnormal weather conditions due to global warming, carbon capture and storage (CCS) technology has attracted global attention as a countermeasure to reduce CO2 emissions. In the Pohang CCS demonstration project in South Korea, 100 tons of CO2 were successfully injected into the subsurface CO2 storage in early 2017. However, after the 2017 Pohang earthquake, the Pohang CCS demonstration project was suspended due to an increase in social concerns about the safety of the CCS project. In this study, to reconfirm the structural suitability of the CO2 storage site in the Pohang Basin, we employed seismic imaging based on reverse-time migration (RTM) to analyze small-scale ocean-bottom seismic data, which have not been utilized in previous studies. Compared with seismic images using marine streamer data, the continuity of subsurface layers in the RTM image using the ocean-bottom seismic data is improved. Based on the obtained subsurface image, we discuss the structural suitability of the Pohang CO2 storage site.

지구온난화로 인한 이상기후현상들이 지속되면서 온실가스 배출을 줄이기 위한 방안으로 이산화탄소 포집 및 저장(Carbon Capture and Storage, CCS) 기술이 전세계적인 주목을 받고 있는 가운데, 국내에서는 2017년 포항분지 영일만 해상 CO2 지중저장 실증 부지에 소규모의 CO2를 성공적으로 주입하였다. 하지만 2017년 발생한 포항지진으로 인하여 국내 CO2 지중저장 사업의 안전성에 대한 사회적 우려가 심각해지면서 포항분지 영일만 CO2 지중저장 실증 사업은 중단되었다. 이 연구에서는 기존 연구에서 활용되지 않았던 해저면 탄성파 탐사자료를 영상화하여, 포항분지 영일만 CO2 지중저장 부지의 구조적 적합성을 재확인하고자 한다. 기존의 스트리머(streamer) 탐사자료를 이용한 영상화 결과와 비교하였을 때, 해저면 탄성파 탐사자료에 역시간 구조보정 기법을 적용한 영상에서 지층의 연속성이 개선되는 것을 확인하였다. 새로 획득한 역시간 구조보정 영상을 기반으로, 포항 영일만 CO2 지중저장 부지의 저장층으로서의 적합성에 대하여 논의하였다.

Keywords

Acknowledgement

본 연구는 2019년과 2020년도 정부의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업입니다(NRF-2019K1A3A1A80113341, NRF-2020R1I1A3073977). 또한 2016년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(No. 20162010201980).

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