2-D/3-D Seismic Data Acquisition and Quality Control for Gas Hydrate Exploration in the Ulleung Basin

울릉분지 가스하이드레이트 2/3차원 탄성파 탐사자료 취득 및 품질관리

  • Koo, Nam-Hyung (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, Won-Sik (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, Byoung-Yeop (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Cheong, Snons (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, Young-Jun (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Yoo, Dong-Geun (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Ho-Young (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Park, Keun-Pil (Petroleum and Marine Resources Div., Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • 구남형 (한국지질자원연구원 석유해저자원연구부) ;
  • 김원식 (한국지질자원연구원 석유해저자원연구부) ;
  • 김병엽 (한국지질자원연구원 석유해저자원연구부) ;
  • 정순홍 (한국지질자원연구원 석유해저자원연구부) ;
  • 김영준 (한국지질자원연구원 석유해저자원연구부) ;
  • 유동근 (한국지질자원연구원 석유해저자원연구부) ;
  • 이호영 (한국지질자원연구원 석유해저자원연구부) ;
  • 박근필 (한국지질자원연구원 석유해저자원연구부)
  • Published : 2008.05.31

Abstract

To identify the potential area of gas hydrate in the Ulleung Basin, 2-D and 3-D seismic surveys using R/V Tamhae II were conducted in 2005 and 2006. Seismic survey equipment consisted of navigation system, recording system, streamer cable and air-gun source. For reliable velocity analysis in a deep sea area where water depths are mostly greater than 1,000 m and the target depth is up to about 500 msec interval below the seafloor, 3-km-long streamer and 1,035 $in^3$ tuned air-gun array were used. During the survey, a suite of quality control operations including source signature analysis, 2-D brute stack, RMS noise analysis and FK analysis were performed. The source signature was calculated to verify its conformity to quality specification and the gun dropout test was carried out to examine signature changes due to a single air gun's failure. From the online quality analysis, we could conclude that the overall data quality was very good even though some seismic data were affected by swell noise, parity error, spike noise and current rip noise. Especially, by checking the result of data quality enhancement using FK filtering and missing trace restoration technique for the 3-D seismic data inevitably contaminated with current rip noises, the acquired data were accepted and the field survey could be conducted continuously. Even in survey areas where the acquired data would be unsuitable for quality specification, the marine seismic survey efficiency could be improved by showing the possibility of noise suppression through onboard data processing.

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