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The geothermal potential of Lake Ranau area comes from remain of the magmatic activity on Mt. Seminung. Geothermal manifestations in this area are hot springs estimated to appear through the geological structure. This research carries out measurements of temperature, pH and geochemical data sampling to determine characteristic of the geothermal fluid. The method used in this research uses Cl-SO4-HCO3 geoindicator to determine characteristics of geothermal fluid type, Cl-Li-B geoindicator for origin of the geothermal fluid and Na-K-Mg geoindicator for the maturity of the geothermal fluid. Chemical sampling of geothermal fluid manifestations was taken in Kota Batu Village on three samples (LP-I, LP-II and LP-III) and in Lombok Village on three samples (LP-IV, LP-V and LP-VI). The result of measuring temperature of the geothermal manifestation ranges from 49.2–58.3 °C and pH range from 6.3–6.8. Analysis of the Cl-SO4-HCO3 geoindicator plot reveals geothermal water is a bicarbonate-type fluid in peripheral water conditions. On the other hand, the Cl-Li-B geoindicator ternary plot indicates geothermal fluid with Li loss or B and Cl absorption, suggesting a younger hydrothermal system influenced by volcanic activity (proximity to the heat source) and characterised by its presence in a volcanic rock environment, as depicted in the plotted diagram. The Na-K-Mg geoindicator data and plotting diagram show geothermal fluid manifestation in immature water conditions due to rock leaching process near the surface.

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Geochemical Analysis Based Geoindicator for Geothermal Fluid Manifestation in The Ranau Lake Area, South Ogan Komering Ulu (OKU), South Sumatra

  • 会议论文

  • 发表日期：

    2026年

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  • Mochammad Malik Ibrahim,
  • Harnani Halik,
  • Stevanus Nalendra Jati,
  • Pradana Ahmad Arviano Zainal

摘要

The geothermal potential of Lake Ranau area comes from remain of the magmatic activity on Mt. Seminung. Geothermal manifestations in this area are hot springs estimated to appear through the geological structure. This research carries out measurements of temperature, pH and geochemical data sampling to determine characteristic of the geothermal fluid. The method used in this research uses Cl-SO4-HCO3 geoindicator to determine characteristics of geothermal fluid type, Cl-Li-B geoindicator for origin of the geothermal fluid and Na-K-Mg geoindicator for the maturity of the geothermal fluid. Chemical sampling of geothermal fluid manifestations was taken in Kota Batu Village on three samples (LP-I, LP-II and LP-III) and in Lombok Village on three samples (LP-IV, LP-V and LP-VI). The result of measuring temperature of the geothermal manifestation ranges from 49.2–58.3 °C and pH range from 6.3–6.8. Analysis of the Cl-SO4-HCO3 geoindicator plot reveals geothermal water is a bicarbonate-type fluid in peripheral water conditions. On the other hand, the Cl-Li-B geoindicator ternary plot indicates geothermal fluid with Li loss or B and Cl absorption, suggesting a younger hydrothermal system influenced by volcanic activity (proximity to the heat source) and characterised by its presence in a volcanic rock environment, as depicted in the plotted diagram. The Na-K-Mg geoindicator data and plotting diagram show geothermal fluid manifestation in immature water conditions due to rock leaching process near the surface.