Pressures in the Wairakei Geothermal Field (NZ) in its Natural State

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The near-surface pressure distribution in the Wairakei Geothermal Field prior to exploitation is estimated from early bore hole measurements and drilling logs. Pressure distributions in a bore were rarely measured but can be calculated from the recorded temperature profiles. For a number of bores, a depth and corresponding pressure was estimated, to associate with the undisturbed field conditions, by examining drilling logs for major circulation losses in uncased sections and temperature patterns for internal flows between feeding fissures. In the shallower boiling zone of the field, some points of rapid temperature rise were found in cased sections of bores. These ... continued below

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McNabb, A. & Dickinson, G. January 1, 1995.

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Description

The near-surface pressure distribution in the Wairakei Geothermal Field prior to exploitation is estimated from early bore hole measurements and drilling logs. Pressure distributions in a bore were rarely measured but can be calculated from the recorded temperature profiles. For a number of bores, a depth and corresponding pressure was estimated, to associate with the undisturbed field conditions, by examining drilling logs for major circulation losses in uncased sections and temperature patterns for internal flows between feeding fissures. In the shallower boiling zone of the field, some points of rapid temperature rise were found in cased sections of bores. These were interpreted as being heated by flow of boiling fluid in fissures outside the casing, and pressures were obtained for these depths from the highest temperatures recorded at them, assuming the fluid to be pressurized water at its boiling point.

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  • Report No.: GEO-PROC-95-02
  • Grant Number: None
  • DOI: 10.2172/895962 | External Link
  • Office of Scientific & Technical Information Report Number: 895962
  • Archival Resource Key: ark:/67531/metadc883066

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1995

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 30, 2016, 6:11 p.m.

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McNabb, A. & Dickinson, G. Pressures in the Wairakei Geothermal Field (NZ) in its Natural State, report, January 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc883066/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.