Calibration of a neutron log in partially saturated media. Part II. Error analysis

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Four sources or error (uncertainty) are studied in water content obtained from neutron logs calibrated in partially saturated media for holes up to 3 m. For this calibration a special facility was built and an algorithm for a commercial epithermal neutron log was developed that obtains water content from count rate, bulk density, and gap between the neutron sonde and the borehole wall. The algorithm contained errors due to the calibration and lack of fit, while the field measurements included uncertainties in the count rate (caused by statistics and a short time constant), gap, and density. There can be inhomogeneity … continued below

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47 pages

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Hearst, J. R.; Kasameyer, P. W. & Dreiling, L. A. March 20, 1981.

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Four sources or error (uncertainty) are studied in water content obtained from neutron logs calibrated in partially saturated media for holes up to 3 m. For this calibration a special facility was built and an algorithm for a commercial epithermal neutron log was developed that obtains water content from count rate, bulk density, and gap between the neutron sonde and the borehole wall. The algorithm contained errors due to the calibration and lack of fit, while the field measurements included uncertainties in the count rate (caused by statistics and a short time constant), gap, and density. There can be inhomogeneity in the material surrounding the borehole. Under normal field conditions the hole-size-corrected water content obtained from such neutron logs can have an uncertainty as large as 15% of its value.

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47 pages

Notes

NTIS, PC A03/MF A01.

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  • Society of Professional Well Log Analysts meeting, Mexico City, Mexico, 23 Jun 1981

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  • Report No.: UCRL-85102
  • Report No.: CONF-810616-2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6795576
  • Archival Resource Key: ark:/67531/metadc1184876

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Office of Scientific & Technical Information Technical Reports

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  • March 20, 1981

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  • July 2, 2018, 10:52 p.m.

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  • Feb. 13, 2021, 3:54 a.m.

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Hearst, J. R.; Kasameyer, P. W. & Dreiling, L. A. Calibration of a neutron log in partially saturated media. Part II. Error analysis, article, March 20, 1981; California. (https://digital.library.unt.edu/ark:/67531/metadc1184876/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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