지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제22권3호
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  • Pages.149-159
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  • 2019
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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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암석구성성분검층: 원리, 연구동향 및 향후 과제

Borehole Elemental Concentration Logs: Theory, Current Trends and Next Level

  • 신제현 (한국지질자원연구원 지질환경연구본부) ;
  • 황세호 (한국지질자원연구원 지질환경연구본부)
  • Shin, Jehyun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Hwang, Seho (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2019.08.19
  • 심사 : 2019.08.30
  • 발행 : 2019.08.31
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초록

암석구성성분검층(중성자-감마스펙트로스코피검층)은 중성자선원의 비탄성산란과 중성자포획 작용으로부터 생성되는 감마선을 측정하여 지층의 원위치 광물조성을 추정할 수 있는 기술이다. 일반적으로 지층의 광물조성 평가는 코어에 대한 X선 회절법, X선 형광분석법 등의 실내 시험자료를 주로 이용하고 있으나 이는 조사 구간의 극히 일부분에 대한 결과이며 특히, 유체의 유동 경로 구간은 주로 파쇄대 및 사질층인데 이 구간들의 코어 회수율이 불량하여 조사 구간 전체에 대한 광물조성 평가는 한계가 있다. 따라서 시추공 전 구간에 대한 원위치 광물조성 추정 기술개발은 지중환경 평가에 중요한 역할을 할 수 있다. 이 기술은 전통, 비전통 저류층 평가를 중심으로 최근까지 장비 개발 및 관련 연구가 활발히 진행되고 있는 분야이지만 몇 개 서비스회사의 독점기술로 자세한 정보 미공개, 다양한 지층 및 인공모형을 이용한 화학-광물학 데이터베이스 구축 문제 등으로 국내 연구에 직접적으로 적용하기에는 어려움이 있었다. 이 해설논문에서는 암석구성성분검층의 기본원리, 시스템 구성, 교정시설, 국외 기 개발된 검층시스템 분석 및 연구개발 동향 등을 통해 해당 기술을 소개하고, 국내 시스템 제작을 위한 기술 적용 방안을 검토하였다.

Borehole elemental concentration logging, measuring neutron-induced gamma rays by inelastic scattering and neutron capture interactions between neutron and formation, delivers concentrations of the most common elements found in the minerals and fluids of subsurface formation. X-ray diffraction and X-ray fluorescence analysis from core samples are traditionally used to understand formation composition and mineralogy, but it represents only part of formations. Additionally, it is difficult to obtain elemental analysis over the whole intervals because of poor core recovery zones such as fractures or sand layers mainly responsible for groundwater flow. The development of borehole technique for in situ elemental analysis plays a key role in assessing subsurface environment. Although this technology has advanced consistently starting from conventional and unconventional resources evaluation, it has been considered as exclusive techniques of some major service company. As regards domestic research and development, it has still remained an unexplored field because of some barriers such as the deficiency of detailed information on tools and calibration facility for chemistry and mineralogy database. This article reviews the basic theory of spectroscopy measurements, system configuration, calibration facility, and current status. In addition, this article introduces the domestic researches and self-development status on borehole elemental concentration tools.

키워드

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