Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Seismic Data Processing Suited for Stratigraphic Interpretation in the Domi Basin, South Sea, Korea

남해 대륙붕 도미분지 탄성파자료의 층서해석을 고려한 전산처리

  • Cheong, Snons (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Won-Sik (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Koo, Nam-Hyung (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Ho-Young (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Shin, Won-Chul (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Keun-Pil (Petroleum and Marine Resources Department, Korea Institute of Geoscience and Mineral Resources)
  • 정순흥 (한국지질자원연구원 석유해저연구본부) ;
  • 김원식 (한국지질자원연구원 석유해저연구본부) ;
  • 구남형 (한국지질자원연구원 석유해저연구본부) ;
  • 이호형 (한국지질자원연구원 석유해저연구본부) ;
  • 신원철 (한국지질자원연구원 석유해저연구본부) ;
  • 박근필 (한국지질자원연구원 석유해저연구본부)
  • Received : 2010.06.11
  • Accepted : 2010.11.02
  • Published : 2010.12.28
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Abstract

The Domi Basin in the South Sea of Korea is located between the Jeju Basin and Ulleung Basins, and is characterized by several sediment sags that are interested to have formed by crustal extension. This paper aims to derive an optimized seismic data processing procedure which helps stratigraphic interpretation of the Domi Basin. In particular, our data processing flow incorporated horizon velocity analysis (HVA) and surface-relative wave equation multiple rejection (SRWEMR) to improve the quality of stack section by enhancing the continuity of reflection events and suppressing peg-leg multiples respectively. As a result of processing procedures in this study, unconformities were recognized in the stack section that defines the early and middle Miocene, Eocene-Oligocene sequences. In addition, the overall quality of the stack section was increased as essential data to investigate the evolution of the basin. The suppression of multiple resulted in the identification of the Cretaceous basement. The data processing scheme evaluated through this study is expected to improve the standardization of processing sequences for seismic data from the Domi and adjacent Sora and north-Sora Basins.

남해 대륙붕 도미분지는 제주분지의 북동단에 위치하는 지역으로 동해의 울릉분지와 인접해 있으며 그 발달시기에 대한 연구가 지속적으로 수행되고 있다. 본 연구에서는 도미퇴적분지의 해석에 적합한 탄생파자료 전산처리 모듈을 시험하고 매개변수를 도출하였다. 도미분지 천부 퇴적층인 제3기 층의 경우 반사파 신호의 연속성 향상과 페그레그(peg-leg) 다중반사파 억제가 요구되었고 이를 위하여 중합 층서속도분석(Horizon Velocity Analysis, HVA)과 표면-연관 파동방정식 다중반사파 제거(Surface Relative Wave Equation Multiple Rejection, SRWEMR)모듈을 조합하여 중합단면의 품질을 제고하였따. 연구결과 제작된 도미분지 탄성파 중합단면에서 퇴적층서가 구분되는 부정합면이 인지되었다. 분지의 발달양상 규명에 적절한 중합단면이 도출되었고 다중반사파의 억제로 백악기 기반암의 해석에 도움이 되었다. 본 연구를 통하여 검증된 전산처리과정은 도미분지와 인근 소라분지, 북소라분지의 탄성파 자료 전산처리 품질의 규격화 및 처리속도 향상에 기여할 것으로 기대된다.

Keywords

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