지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제26권3호
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  • Pages.138-149
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  • 2023
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  • 1229-1064(pISSN)
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  • 2384-051X(eISSN)
한국지구물리·물리탐사학회 (Korean Society of Earth and Exploration Geophysicists)
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심부 시추코어 실험실 분석자료와 탄성파 탐사자료 통합 분석을 통한 대한해협 천부 퇴적층 임피던스 도출

P-Impedance Inversion in the Shallow Sediment of the Korea Strait by Integrating Core Laboratory Data and the Seismic Section

  • 정순홍 (한국지질자원연구원 기후변화대응연구본부) ;
  • 이광수 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 손우현 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 김길영 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 유동근 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 최윤석 (한국지질자원연구원 해저지질에너지연구본부)
  • Snons Cheong (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Gwang Soo Lee (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Woohyun Son (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Gil Young Kim (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Dong Geun Yoo (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Yunseok Choi (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2023.07.03
  • 심사 : 2023.08.23
  • 발행 : 2023.08.31
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초록

해저지층의 지질특성을 파악하는 것은 지구과학 및 공학에서 중요한 과업으로 신뢰도 높은 탐사자료를 확보하는 경우 가능하다. 대한민국 남동해역 대한해협 천부 지층의 특성을 파악하기 위하여 심부 시추 지층물성 실험실 분석자료와 탄성파 탐사자료를 확보하였고, 이를 통합 분석하였다. 해저면 심도 200 m 하부까지 심부 시추코어를 회수하여 천부 지층 탄성파 음파속도 로그를 얻었고, 탄성파 단면과 대비하였다. 지층 음파속도 로그와 시간 영역 탄성파 자료는 시간-심도 변환을 수행하여 상관성이 15%에서 45%로 증가하였다. 탄성파 임피던스 초기모형을 설정하고 모형기반, 대역제한 및 산재쐐기 역산을 각각 수행하여 결과를 비교하였다. 도출된 탄성파 임피던스는 천부 지층 내부 퇴적층이 우세한 영역과 미고결 영역에서 변화되는 양상을 보였다. 본 연구에서 수행된 음파 임피던스 역산 기법은 향후 지층 물성분석 로그자료와 탄성파자료의 추가 확보 시 통합 분석을 위한 프레임워크로, 임피던스 분포 단면은 해저면 단층 규명과 천부가스 누출 탐지 등에 활용 가능하다. 국내 해양 심부 시추는 이산화탄소 저장 후보지 특성 파악과 자원 부존 평가 등을 목적으로 지속 추진되고 있으므로 통합 역산의 지구물리 분야 적용 가치가 높아질 것으로 기대된다.

In geoscience and engineering the geological characteristics of sediment strata is crucial and possible if reliable borehole logging and seismic data are available. To investigate the characteristics of the shallow strata in the Korea Strait, laboratory sonic logs were obtained from deep borehole data and seismic section. In this study, we integrated and analyzed the sonic log data obtained from the drilling core (down to a depth of 200 m below the seabed) and multichannel seismic section. The correlation value was increased from 15% to 45% through time-depth conversion. An initial model of P-wave impedance was set, and the results were compared by performing model-based, band-limited, and sparse-spike inversions. The derived P-impedance distributions exhibited differences between sediment-dominant and unconsolidated layers. The P-impedance inversion process can be used as a framework for an integrated analysis of additional core logs and seismic data in the future. Furthermore, the derived P-impedance can be used to detect shallow gas-saturated regions or faults in the shallow sediment. As domestic deep drilling is being performed continuously for identifying the characteristics of carbon dioxide storage candidates and evaluating resources, the applicability of the integrated inversion will increase in the future.

키워드

과제정보

본 연구는 한국지질자원연구원 주요사업인 "3D 해저 정밀영상화를 위한 복합 탄성파 탐사 및 실규모 고분해능 처리기술 개발(23-3312)"과제와 "CO2 지중저장소 저장효율 향상 및 안전성 평가 기술 개발(23-3413)"과제의 일환으로 수행되었습니다.

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