지질공학 (The Journal of Engineering Geology)

  • 제21권4호
  • /
  • Pages.323-336
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  • 2011
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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암석 내 공극구조의 평가를 위한 전기임피던스의 적용

Application of the Electrical Impedance of Rocks in Characterizing Pore Geometry

  • 추민경 (충남대학교 지질환경과학과) ;
  • 송인선 (한국지질자원연구원 지구환경연구본부) ;
  • 이희권 (한국지질자원연구원 지구환경연구본부) ;
  • 김태희 (한국지질자원연구원 지구환경연구본부) ;
  • 장찬동 (충남대학교 지질환경과학과)
  • Choo, Min-Kyoung (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Song, In-Sun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Hi-Kweon (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Tae-Hee (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Chang, Chan-Dong (Department of Geology and Earth Environmental Sciences, Chungnam National University)
  • 투고 : 2011.10.13
  • 심사 : 2011.12.02
  • 발행 : 2011.12.30
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초록

지각의 수리역학적 거동은 유효공극의 크기 및 모양 등의 영향을 많이 받는다. 본 연구에서는 지하 유체의 이동 및 저장소가 되는 암석의 공극 특성을 전기임피던스를 이용하여 규명하였다. 공극의 구조가 서로 다른 3종의 화강암(황등, 포천, 양산)과 2종의 사암(보령, Berea)의 암석 시편(지름 : 38-50 mm, 길이 70-100 mm)을 전기전도도가 다론 전해질로 순차적으로 포화시킨 다음 시편의 전기임피던스를 측정하였다. 실험 결과 공극수의 염도가 증가할수록 전기비저항은 감소하고, 전기용량은 증가하는 뚜렷한 경향을 보였다. 또한 같은 염도의 공극수 조건 하에서 암석의 공극률이 증가할수록 전기비저항과 formation factor는 감소하지만, 전기용량 값은 증가하는 경향을 보였다. 이방성을 갖는 Berea 사암에서는 층리와 수직 방향의 임피던스를 측정했을 때 저항이 가장 크게 나왔으며, tortuosity와 cementation factor 값도 가장 높게 산정 되었다. 이는 층리의 수직 방향으로 공극의 연결성이 떨어진다는 것을 의미한다. 따라서 본 연구의 실험 결과는 암석의 전기적 특성이 공극률 뿐 아니라 공극의 구조와도 관련이 있음을 보여준다.

The hydro-mechanical behavior of the Earth's crust is strongly dependent on the fractional volume and geometrical structure of effective pore spaces. This study aims to understand the characteristics of pores using electrical impedance. We measured the electric impedance of core samples (diameter, 38-50 mm; length, 70-100 mm) of three types of granite (Hwangdeung, Pocheon, and Yangsan) and two types of sandstone (Boryung and Berea) with different porosities and pore structures, after saturation with saline water of varying salinities. The results show that resistance decreases but capacitance increases with increasing salinity of the pore fluid. For a given salinity, the resistivity and formation factor are reduced with increasing porosity of the rocks, and the capacitance increases. Berea sandstone shows anisotropy in resistance, tortuosity, and cementation factor, with these factors being highest normal to bedding planes. This result indicates that the connectivity of pores is weakest normal to bedding. In conclusion, the electrical characteristics of the tested samples are related not only to their porosity but also to the pore geometry.

키워드

과제정보

연구 과제번호 : 이산화탄소 지중저장을 위한 지질학적 기본설계 기술개발

연구 과제 주관 기관 : 한국지질자원연구원

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피인용 문헌

  1. Evaluation of Pore Size Distribution of Berea Sandstone using X-ray Computed Tomography vol.24, pp.3, 2014, https://doi.org/10.9720/kseg.2014.3.353
  2. A Study of Locally Changing Pore Characteristics and Hydraulic Anisotropy due to Bedding of Porous Sandstone vol.23, pp.3, 2013, https://doi.org/10.7474/TUS.2013.23.3.228
  3. X-ray CT를 이용한 분무식 방수 멤브레인의 공극 내 물 침투 분석 vol.16, pp.4, 2011, https://doi.org/10.12814/jkgss.2017.16.4.211