Petrology and Hydrothermal Alteration Mineral Distribution of Wells LA-9D and LA-10D in Aluto Geothermal Field, Ethiopia Geothermal Field


Dereje MOGES

Key Words:

Igneous rocks, Major oxides, Trace elements, XRF, XRD, Alteration minerals.


Stanford Geothermal Workshop







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2142 KB

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Laboratory analysis of igneous rocks is performed with the help of the main oxide plots. Lithology of the two wells was identified using the main oxides obtained using the XRF method. Twenty four (24) drill cutting samples with different degrees of alteration were analyzed to determine and identify the rock types, by plotting these well samples on special diagrams, and correlate with the regional rocks. The results for the analysis of the main oxides and trace elements of 24 samples are presented. Alteration analysis in the two well samples was conducted for 21 samples from two wells for identifying clay minerals. Bulk sample analysis indicated quartz, illite & micas, calcite, cristobalite, smectite, pyrite, epidote, alunite, chlorite, wairakite, diaspore and kaolin minerals present in both wells. Hydrothermal clay minerals such as illite, chlorite, smectite and kaolin minerals were identified in both wells by X-ray diffraction. High temperature hydrothermal minerals; such as, wairakite, biotite, and epidote exists in both wells based on the X-ray diffraction analysis result.

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