Geological structures from televiewer logs of GT-2, Fenton Hill, New Mexico: Part 3, Quality control

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A procedure has been developed for extracting geological structures from paper prints of intensity-mode televiewer logs. It was applied to old logs of drill hole GT-2 at the Fenton Hill, New Mexico, Hot Dry Rock Site. A series of tests have also been developed for measuring the resultant data quality, and this report describes these tests and applies them to evaluate the procedure. A test for measurement accuracy shows that locations were measured to better than 0.1 ft and orientations to within 1/sup 0/. The root-mean-square error in fitting a trace rarely exceeded 0.2 ft. The second set of tests, ... continued below

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Pages: 20

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Burns, K.L. December 1, 1987.

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Description

A procedure has been developed for extracting geological structures from paper prints of intensity-mode televiewer logs. It was applied to old logs of drill hole GT-2 at the Fenton Hill, New Mexico, Hot Dry Rock Site. A series of tests have also been developed for measuring the resultant data quality, and this report describes these tests and applies them to evaluate the procedure. A test for measurement accuracy shows that locations were measured to better than 0.1 ft and orientations to within 1/sup 0/. The root-mean-square error in fitting a trace rarely exceeded 0.2 ft. The second set of tests, for reproducibility, measures the amount of association between two different runs of the same length of hole, in this case a distance of 275 ft. Two new measures of association are defined, termed coplanarity and collinearity. The lack of any recurrences requires explanation and leads to a third set of tests, for repetition rate. The low repetition rate is explained by random errors in location and orientation, which are different on each run. A fourth set of tests consists of fitting a model of the feature-extraction process to the data and estimating data reliability from quality parameters of the model. A perception model yielded an estimate of data quality at 91.5%.

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Pages: 20

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NTIS, PC A03/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE88005086
  • Report No.: LA-10619-HDR-Pt.3
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5720112 | External Link
  • Office of Scientific & Technical Information Report Number: 5720112
  • Archival Resource Key: ark:/67531/metadc1093142

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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.

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Creation Date

  • December 1, 1987

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • May 22, 2018, 6:46 p.m.

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Burns, K.L. Geological structures from televiewer logs of GT-2, Fenton Hill, New Mexico: Part 3, Quality control, report, December 1, 1987; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1093142/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.