Geochemical analysis and G.I.S. update of geothermal prospects in Kenya

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  • Kiprono BETT Alvin
    Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University Department of Mining, Materials and Petroleum Engineering, Jomo Kenyatta University of Agriculture and Technology
  • JOHN Ngethe
    Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University Department  of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology
  • JALILINASRABADY Saeid
    Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University

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  • ケニアの未開発地熱地帯における地化学分析と地熱マップの更新

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Abstract

<p>This paper studies the geothermal prospects of new manifestations and hot springs distributed in Kenya. Geothermal resource prospecting begins with geochemical sampling and analysis. The concentrations of the chemical species were used as a basis geo-thermometer of the reservoir. In addition, the paper updates the geothermal map of Kenya, and provides geochemical analyses of six hot springs. The recorded hot springs range between 30 to 75°C, pH values are 7-8, and conductivities are 18.4-2,370 m-s/m. The study aimed to map new geothermal prospects, classify the hot springs water, and determine the potential resource application in the region. The water samples were analyzed for significant anions, cations, silica, and trace elements. Then reservoir temperatures were estimated using silica and cations geothermometry in the range of 80-247°C. The Homa Hills prospect exhibits characteristics of Na-HCO3 waters with high sulphate and chloride species concentrations. From Piper ternary diagrams, all the hot spring waters can be classified as peripheral carbonated waters. Apart from Kakdhimu hot spring, the rest are significantly diluted by groundwater, and therefore, their chemical constituents are in small concentrations, giving little or no information about their origin. The Mulotʼs hot springs water has a soda taste due to the high concentration of HCO3-1. Considering their low temperatures, the hot springs could be suitable for direct use; e.g., aquaculture, spa, and greenhouse warming.</p>

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