Hydrocarbons in Soil Gas as Pathfinders in Geothermal Resource Surveys in Indonesia

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A surface geochemical technique utilizing normal paraffin (C{sub 7+}) and aromatic (C{sub 8}) hydrocarbons in soil gas has been successfully used as pathfinders in surveys for geothermal resources in Indonesia. The Dieng field was used to test the technique. The result shows the paraffin anomalies to be near and over productive wells. Because productive wells usually lie over upflow zones it reinforces our hypothesis that paraffins define the upflow of geothermal systems. The aromatic hydrocarbon alkylbenzene C{sub 8} was found near and around productive wells in the southeast quadrant of the Dieng field (Sikidang-Merdada area) but they are more spread ... continued below

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Pudjianto, R.; Suroto, M.; Higashihara, M.; Fukuda, M. & Ong, Akhadiana and Jan January 1, 1995.

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Description

A surface geochemical technique utilizing normal paraffin (C{sub 7+}) and aromatic (C{sub 8}) hydrocarbons in soil gas has been successfully used as pathfinders in surveys for geothermal resources in Indonesia. The Dieng field was used to test the technique. The result shows the paraffin anomalies to be near and over productive wells. Because productive wells usually lie over upflow zones it reinforces our hypothesis that paraffins define the upflow of geothermal systems. The aromatic hydrocarbon alkylbenzene C{sub 8} was found near and around productive wells in the southeast quadrant of the Dieng field (Sikidang-Merdada area) but they are more spread out and more diffuse than the paraffins. The shape of their anomaly seems to suggest a tendency of spreading into the direction of lower elevations. It is thought that the aromatics, which are much more soluble than their corresponding paraffins, express at the surface as anomalies not only of locations of the upflow but also of the outflow of the geothermal system as well. Therefore the combined paraffin and aromatic anomalies, and topography, may be used as an indicator for the direction of the outflow or the flow of the under ground waters. The scarcity of the aromatics in the northwest quadrant of the Dieng field (Sileri area) is unique. A hypothesis has been proposed which could explain this unique feature.

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  • Proceedings of The 17th New Zealand Geothermal Workshop 1995

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  • Report No.: GEO-PROC-95-02
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 895892
  • Archival Resource Key: ark:/67531/metadc885189

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  • January 1, 1995

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 5, 2016, 8:32 p.m.

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Pudjianto, R.; Suroto, M.; Higashihara, M.; Fukuda, M. & Ong, Akhadiana and Jan. Hydrocarbons in Soil Gas as Pathfinders in Geothermal Resource Surveys in Indonesia, article, January 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc885189/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.