Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Benchmark Test Study of Localized Digital Streamer System

국산화 디지털 스트리머 시스템의 벤치마크 테스트 연구

  • Jungkyun Shin (Pohang Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Jiho Ha (Pohang Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Gabseok Seo (Pohang Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Young-Jun Kim (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Nyeonkeon Kang (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Jounggyu Choi (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Dongwoo Cho (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Hanhui Lee (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Seong-Pil Kim (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources)
  • 신정균 (한국지질자원연구원 포항지질자원실증연구센터) ;
  • 하지호 (한국지질자원연구원 포항지질자원실증연구센터) ;
  • 서갑석 (한국지질자원연구원 포항지질자원실증연구센터) ;
  • 김영준 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 강년건 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 최종규 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 조동우 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 이한희 (한국지질자원연구원 해저지질에너지연구본부) ;
  • 김성필 (한국지질자원연구원 해저지질에너지연구본부)
  • Received : 2023.04.06
  • Accepted : 2023.05.15
  • Published : 2023.05.31
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Abstract

The use of ultra-high-resolution (UHR) seismic surveys to preceisly characterize coastal and shallow structures have increased recently. UHR surveys derive a spatial resolution of 3.125 m using a high-frequency source (80 Hz to 1 kHz). A digital streamer system is an essential module for acquiring high-quality UHR seismic data. Localization studies have focused on reducing purchase costs and decreasing maintenance periods. Basic performance verification and application tests of the developed streamer have been successfully carried out; however, a comparative analysis with the existing benchmark model was not conducted. In this study, we characterized data obtained by using a developed streamer and a benchmark model simultaneously. Tamhae 2 and auxiliary equipment of the Korea Institute of Geoscience and Mineral Resources were used to acquire 2D seismic data, which were analyzed from different perspectives. The data obtained using the developed streamer differed in sensitivity from that obtained using benchmark model by frequency band.However, both type of data had a very high level of similarity in the range corresponding to the central frequency band of the seismic source. However, in the low frequency band below 60 Hz, data obtained using the developed streamer showed a lower signal-to-noise ratio than that obtained using the benchmark model.This lower ratio can hinder the quality in data acquisition using low-frequency sound sources such as cluster air guns. Three causes for this difference were, and streamers developed in future will attempt to reflect on these improvements.

육지와 인접한 연안, 그리고 천부 구조의 특성을 정밀하게 규명하기 위하여 높은 주파수 대역(80 Hz~1 kHz)의 음원을 활용하여 3.125 m 수준의 공간 해상도를 도출하는 초고해상 탄성파 탐사의 활용범위가 증가하고 있다. 디지털 스트리머 시스템은 고품질의 초고해상 탄성파 자료를 획득하기 위한 필수 모듈이며 도입 비용의 절감, 유지보수 기간의 단축 등을 위하여 국산화 연구가 이루어졌다. 개발된 국산화 스트리머에 대한 기본적인 성능 검증, 현장 운용성 검토 등은 해당 연구개발 과정에서 이루어졌으나 기존에 활용되는 벤치마크 모델과의 비교분석 연구는 수행되지 않았다. 본 연구에서는 국산화 스트리머와 벤치마크 모델을 활용해 동시에 자료를 취득하여 자료의 특성을 분석하였다. 이를 위하여 한국지질자원연구원 탐해2호와 부대장비 등을 활용한 2차원 탄성파 탐사자료를 취득하고 다양한 측면에서의 분석이 이루어졌다. 국산화 스트리머에서 취득된 자료는 벤치마크 모델에서 취득된 자료와 주파수 대역별 민감도 차이가 있었으나, 음원의 중심 주파수 대역을 고려한 범위에서는 매우 높은 수준의 유사성을 가지고 있다. 하지만, 60 Hz 이하의 낮은 주파수 대역에서는 벤치마크 모델 대비 낮은 신호대잡음비를 나타내었으며 이는 클러스터 에어건 등 낮은 주파수 대역의 음원을 활용한 자료취득에서는 품질을 저해하는 요소로 작용할 것이다. 이러한 차이를 발생시키는 원인은 세 가지(1. 스트리머 내부 발생 잡음, 2. 스트리머 예인 진동, 3. 아날로그 필터 컷 오프 주파수 대역)가 발굴되었으며 향후 제작되는 국산화 스트리머에서는 이에 대한 개선을 반영하고자 한다.

Keywords

Acknowledgement

본 연구는 해양수산부의 '해양산업 수요기반 기술개발사업'의 '초고해상도 해저지층탐사를 위한 소형 디지털 스트리머시스템 개발' 종료 과제의 후속 연구로 수행되었습니다. 또한, 한국지질자원연구원 주요사업인 '3D 해저 정밀영상화를 위한 복합 탄성파 탐사 및 실규모 고분해능 처리기술 개발(23-3312)'과제와 '해저탐사선 운항 안정화 및 연근해 탐사기술 개발 (23-3313)'과제의 일환으로 수행되었습니다.

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