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Pulsed Nuclear Magnetic Resonance Studies of Oil Shales--estimation of Potential Oil Yields.

Miknis FP; Decora AW; Cook GL
NTIS: PB 240 023 :47 pages
Previous studies at the Bureau of Mines have shown that broad-line nuclear magnetic resonance (nmr) techniques have potential applications for rapid evaluation of oil-shale deposits. In a continuation of this study, the techniques of pulsed nmr have been applied in a similar manner. The basis for the pulsed nmr oil-shale assay method lies in the assumption that the free induction decay (fid) amplitude following a 90 deg pulse is proportional to the potential oil yield. This assumption was tested on two groups of oil-shale samples, numbering 141 and 263 samples, from two different oil-shale cores. For both groups of samples, a small number were selected as calibration samples. Free induction decay amplitude measurements were made on the 141 and 263 samples. The best least- squares regression line was obtained for the calibration samples, and the oil yields of the remaining samples were calculated using the slopes and intercepts obtained in the regression analyses. The agreement between measured and calculated oil yields was good; the indexes of determination were 0.93 and 0.89 For the groups of 141 and 263 samples, respectively. Work done in cooperation with the University of Wyoming.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7984
NIOSH Division
Source Name
NTIS: PB 240 023
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division