Geologic Interpretation of the Geothermal Potential of the North Bonneville Area

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Description

Possible geothermal development for the township of North Bonneville, Washington is being investigated because of the proximity of the town to hot springs in a geologic province of good geothermal potential. Surface expression of geothermal resources is provided by conduits through an impermeable reservoir cap and is therefore generally structurally controlled. Near North Bonneville the geologic formations that underlie potential drilling sites are the Eagle Creek formation and the Ohanpecosh Formation. The Lower Miocene Eagle Creek Formation is composed of poorly consolidated volcanic conglomerates, sandstones, tuffs, and includes a few minor interbedded lava flows. The Eocene-Oligiocene Ohanapecosh (Weigle) Formation in ... continued below

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Nielson, D. L. & Moran, M. R. February 15, 1980.

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  • Geothermal Energy Program (U.S.)
    Publisher Info: DOEEEGTP (USDOE Office of Energy Efficiency and Renewable Energy Geothermal Tech Pgm)
    Place of Publication: United States

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Description

Possible geothermal development for the township of North Bonneville, Washington is being investigated because of the proximity of the town to hot springs in a geologic province of good geothermal potential. Surface expression of geothermal resources is provided by conduits through an impermeable reservoir cap and is therefore generally structurally controlled. Near North Bonneville the geologic formations that underlie potential drilling sites are the Eagle Creek formation and the Ohanpecosh Formation. The Lower Miocene Eagle Creek Formation is composed of poorly consolidated volcanic conglomerates, sandstones, tuffs, and includes a few minor interbedded lava flows. The Eocene-Oligiocene Ohanapecosh (Weigle) Formation in its nearest exposures to North Bonneville is composed of volcaniclastics and lava flows. The Ohanapecosh has been altered to zeolites and clays and is therefore well consolidated and impermeable. The lack of permeability provides the necessary reservoir cap for any geothermal system that may be present at depth. This formation, to the northeast, in the Wind River drainage is greater than 19,000 ft. thick. Circulation of geothermal heated water from this thick sequence of impermeable strata must be associated with penetrating fracture zones.

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  • Report No.: None
  • Grant Number: None
  • DOI: 10.2172/897409 | External Link
  • Office of Scientific & Technical Information Report Number: 897409
  • Archival Resource Key: ark:/67531/metadc887468

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  • February 15, 1980

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 1:19 p.m.

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Nielson, D. L. & Moran, M. R. Geologic Interpretation of the Geothermal Potential of the North Bonneville Area, report, February 15, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc887468/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.