Application of magnetic method to assess the extent of high temperature geothermal reservoirs

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The extent of thermally altered rocks in high temperature geothermal reservoirs hosted by young volcanic rocks can be assessed from magnetic surveys. Magnetic anomalies associated with many geothermal field in New Zealand and Indonesia can be interpreted in terms of thick (up to 1 km) demagnetized reservoir rocks. Demagnetization of these rocks has been confirmed by core studies and is caused by hydrothermal alteration produced from fluid/rock interactions. Models of the demagnetized Wairakei (NZ) and Kamojang (Indonesia) reservoirs are presented which include the productive areas. Magnetic surveys give fast and economical investigations of high temperature prospects if measurements are made ... continued below

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71-78

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Soengkono, S. & Hochstein, M.P. January 26, 1995.

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Description

The extent of thermally altered rocks in high temperature geothermal reservoirs hosted by young volcanic rocks can be assessed from magnetic surveys. Magnetic anomalies associated with many geothermal field in New Zealand and Indonesia can be interpreted in terms of thick (up to 1 km) demagnetized reservoir rocks. Demagnetization of these rocks has been confirmed by core studies and is caused by hydrothermal alteration produced from fluid/rock interactions. Models of the demagnetized Wairakei (NZ) and Kamojang (Indonesia) reservoirs are presented which include the productive areas. Magnetic surveys give fast and economical investigations of high temperature prospects if measurements are made from the air. The magnetic interpretation models can provide important constraints for reservoir models. Magnetic ground surveys can also be used to assess the extent of concealed near surface alteration which can be used in site selection of engineering structures.

Physical Description

71-78

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  • Proceedings, Twentieth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, January 24-26, 1995

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  • Report No.: SGP-TR-150-11
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 889355
  • Archival Resource Key: ark:/67531/metadc884675

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  • January 26, 1995

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 8:14 p.m.

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Soengkono, S. & Hochstein, M.P. Application of magnetic method to assess the extent of high temperature geothermal reservoirs, article, January 26, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc884675/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.