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2024 Vol.34, Issue 2 Preview Page

Research Article

Hydrochemistry, Isotopic Characteristics, and Formation Model Geothermal Waters in Dongrae, Busan, South Korea

부산 동래 온천수의 수리화학 및 동위원소 특성, 생성모델 연구

Yujin Lee1
,
Chanho Jeong2*
,
Yongcheon Lee3*
이 유진1
,
정 찬호2*
,
이 용천3*
1Senior Researcher, Geological Engineering Research Center, Daejeon University
2Professor, Disaster Prevention and Safety Engineering, Daejeon University
3Adjunct Assistant Professor, Disaster Prevention and Safety Engineering, Daejeon University
1대전대학교 지질공학연구소 선임연구원
2대전대학교 재난안전공학과 교수
3대전대학교 재난안전공학과 대우조교수
*Corresponding Author
*Corresponding Author
30 June 2024. pp. 229-248
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Abstract

This investigated the hydrogeochemical and isotopic characteristics of geothermal waters, groundwaters, and surface waters in Dongrae-gu, Busan, South Korea, in order to determine the origins of the salinity components in the geothermal waters, and their formation mechanisms and heat sources The geothermal waters are Na-Cl-type, distinct from surrounding groundwaters (Na-HCO3- and, Ca-HCO3-(SO4, Cl)-type) and surface waters (Ca-HCO3(SO4, Cl)-type). This indicates the geothermal waters formed at depth as compared with the groundwaters.δ18O and δD values of the geothermal waters are relatively depleted as compared with the groundwaters, due to altitude effects and deep circulation of the geothermal waters. Helium and neon isotope ratios (3He/4He and, 4He/20Ne) of the geothermal waters plot on a single mixing line between mantle (3He = 3.76~4.01%) and crust (4He = 95.99~96.24%), indirectly suggesting that the heat source is due to the decay of radioactive elements in rocks. The geothermal reservoir temperatures were calculated using the silica-enthalpy and Giggenbach models, yielding values of 82~130°C, and the depth of the geothermal reservoir is estimated to be 1.7~2.9 km below the surface. The correlation between Cl/Na and Cl/HCO3 for the Dongrae geothermal waters requires the input of salty water. The supply of saline composition is interpreted due to the dissolution of residual paleo-seawater.

Keywords
geothermal water
hydrochemistry
helium isotope
residual paleo-seawater
reservoir temperature
formation mechanism

연구의 목적은 부산광역시 동래구에서 산출되는 온천수와 주변 지하수 및 지표수의 수리화학 및 동위원소 특성의 규명과 동래 온천수에 함유된 염수 성분의 기원에 대한 해석, 그리고 온천수의 열원을 포함한 생성 메커니즘을 밝히는 것이다. 동래 온천수의 수리화학적으로 Na-Cl 유형이며, 주변지하수(Na-HCO3, Ca-HCO3(SO4, Cl)), 지표수(Ca-HCO3(SO4, Cl))의 유형과는 다른 형태를 보인다. 이는 지하수에 비해 온천수가 보다 심부의 다른 지화학적 환경에 있음을 지시한다. δ18O와 δD 분석결과 온천수는 지하수에 비해 상대적으로 결핍된 값을 보여주며, 이는 온천수의 함양지역에 대한 고도효과를 반영하고, 온천수의 심부 순환과정을 지시한다. 온천수내 헬륨과 네온 동위원소비(3He/4He, 4He/20Ne)는 맨틀기원(3He = 3.76~4.01%)과 지각기원(4He = 95.99~96.24%) 범위에서 대기기원 헬륨과의 단일혼합선상에 도시되어 온천의 열원이 암석내 방사성물질의 붕괴에 의한 열임을 간접적으로 지시한다. 실리카-엔탈피 모델, Giggenbach 모델 등으로 계산된 지열저장소 온도는 82~130°C의 범위로 계산되었으며, 지열저장소의 깊이는 지표로부터 약 1.7~2.9 km로 계산되었다. 동래 온천수의 Cl/Na 및 Cl/HCO3의 당량비 상관관계는 해수의 혼합영향을 지시하며, 해수의 유입은 잔류고염수의 용해로 해석된다.

키워드
온천수
수리화학
헬륨동위원소
잔류고염수
지열저장소 온도
생성 메커니즘
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 34
  • No :2
  • Pages :229-248
  • Received Date : 2024-04-22
  • Revised Date : 2024-06-10
  • Accepted Date : 2024-06-14
  • DOI :https://doi.org/10.9720/kseg.2024.2.229
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