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시추공 연계 전기비저항 탐사의 반응 특성 및 적용 사례 분석

Analysis of Response Characteristics in Borehole Electrical Resistivity Surveys and Their Applications

손정술|송서영|남명진|김빛나래|조아현
한국자원공학회 (The Korean Society of Mineral and Energy Resources Engineers)|2023.10|한국자원공학회지 (Journal of the Korean Society of Mineral and Energy Resources Engineers)|제60권 제5호|pp. 377-394

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참고문헌

키워드

electrical resistivity tomography전기비저항 토모그래피시추공-시추공 전기비저항 탐사지표-시추공 전기비저항 탐사crosshole electrical resistivity tomographysurface- to-borehole electrical resistivity tomography
주제분류자원공학

초록

전기비저항 탐사법은 광물탐사, 환경, 지하 안전 분야 등에서 중요한 물리탐사법으로 활용된다. 주로 지표에서 수행하지만, 깊은 심도의 매질에 대한 고해상도 정보를 얻기 위해 시추공 간 또는 지표와 시추공 사이에 토모그래피를 수행하기도 한다. 이러한 시추공 연계 탐사법은 지표 탐사법과 전극 배열법 및 민감도가 다르기 때문에, 전극 배열법이나 측정 환경의 차이로 인해 발생하는 문제점들을 고려해야 한다. 본 연구에서는 기존 시추공 연계 전기비저항 탐사법의 다양한 전극 배열법에대해서 정리하고 이에 따른 자료 특성을 분석하였다. 또한, 시추공 전기비저항 탐사 자료에서 발생하는 왜곡과 이 영향을 감소시킬 수 있는 해결 방안을 분석하였다. 시추공 전기비저항 탐사를 활용한 연구 사례를 소개하고자 한다.

Abstract

The direct current electrical resistivity survey or electrical resistivity tomography (ERT) is a geophysical exploration technique employed in various fields, including mineral exploration, environmental studies, and subsurface safety assessments. ERT, primarily conducted at the surface, can also be conducted between adjacent boreholes to yield high-resolution subsurface images at greater depths. Compared to surface exploration methods, cross-hole ERT employs distinct electrode configurations with varying sensitivities, making it crucial to consider these differences in electrode configuration or measurement environment conditions. This study elucidates electrode configurations and subsequently analyzes the characteristics of cross-hole ERT data for each electrode configuration. Following this, we explore the peculiarities stemming from borehole ERT data. We also describe distortions in ERT data caused by survey geometry and provide an examination of potential solutions to mitigate these distortions. Additionally, we introduce several case studies involving borehole ERTs.

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