Modeling of geochemical interactions between acidic and neutral fluids in the Onikobe Geothermal Reservoir

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Two types of fluids are encountered in the Onikobe geothermal reservoir, one is neutral and the other is acidic (pH=3). It is hypothesized that acidic fluid might be upwelling along a fault zone and that an impermeable barrier might be present between the acidic and neutral fluid zones. We carried out reactive geothermal transport simulations using TOUGHREACT (Xu and Pruess, 1998 and 2001) to test such a conceptual model. One-dimensional models were used to study the geochemical behavior due to mixing of the two fluids. Mn-rich smectite precipitated near the mixing front and is likely to form an impermeable barrier ... continued below

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7 pages

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Todaka, Norifumi; Akasaka, Chitoshi; Xu, Tianfu & Pruess, Karsten January 10, 2003.

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Two types of fluids are encountered in the Onikobe geothermal reservoir, one is neutral and the other is acidic (pH=3). It is hypothesized that acidic fluid might be upwelling along a fault zone and that an impermeable barrier might be present between the acidic and neutral fluid zones. We carried out reactive geothermal transport simulations using TOUGHREACT (Xu and Pruess, 1998 and 2001) to test such a conceptual model. One-dimensional models were used to study the geochemical behavior due to mixing of the two fluids. Mn-rich smectite precipitated near the mixing front and is likely to form an impermeable barrier between regions with acidic and neutral fluids.

Physical Description

7 pages

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OSTI as DE00808942

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  • 28th Workshop on Geothermal Reservoir Engineering, Palo Alto, CA (US), 01/27/2003--01/29/2003

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  • Report No.: LBNL--52002
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 808942
  • Archival Resource Key: ark:/67531/metadc735571

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  • January 10, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 1:39 p.m.

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Todaka, Norifumi; Akasaka, Chitoshi; Xu, Tianfu & Pruess, Karsten. Modeling of geochemical interactions between acidic and neutral fluids in the Onikobe Geothermal Reservoir, article, January 10, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc735571/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.