Case history on geothermal-well-log interpretation: Surprise Valley, California

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Well logs from a 1972 geothermal well drilled in California's Surprise Valley are discussed. The well is in an igneous formation, primarily basalt in the logged interval, and had a bottom-hole temperature of about 170/sup 0/C at a total depth exceeding 1400 m. It produced good flow rates from what is presumably a formation with predominately fracture-related permeability. The well has special interest because fractures could be located approximately by the appearance of well-defined secondary crystallization in the drill cuttings. The original use of the log data in evaluating the well when it was drilled is discussed. In addition, the ... continued below

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Medium: P; Size: Pages: 63

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Rigby, F.A. & Zebal, G.P. June 1, 1981.

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Description

Well logs from a 1972 geothermal well drilled in California's Surprise Valley are discussed. The well is in an igneous formation, primarily basalt in the logged interval, and had a bottom-hole temperature of about 170/sup 0/C at a total depth exceeding 1400 m. It produced good flow rates from what is presumably a formation with predominately fracture-related permeability. The well has special interest because fractures could be located approximately by the appearance of well-defined secondary crystallization in the drill cuttings. The original use of the log data in evaluating the well when it was drilled is discussed. In addition, the log data are reviewed and valuable data are obtained on log response in basalts, the effects of secondary mineralization, fracture detection, and aspects of the resistivity logs. The Surprise Valley well gives a clear demonstration of the value of thorough logging in geothermal exploratory wells, especially in the identification and location of potential production zones.

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Medium: P; Size: Pages: 63

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NTIS, PC E03/MF A01.

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  • Other: DE81028544
  • Report No.: LA-8598-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/6309391 | External Link
  • Office of Scientific & Technical Information Report Number: 6309391
  • Archival Resource Key: ark:/67531/metadc1207414

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • June 1, 1981

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Sept. 5, 2018, 2:18 p.m.

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Rigby, F.A. & Zebal, G.P. Case history on geothermal-well-log interpretation: Surprise Valley, California, report, June 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1207414/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.