Mineralogy and lithology of Utah oil shale and their influence on logging response
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:6135935
Detailed mineralogic and lithologic investigations of the Green River Formation oil shale in Uintah County, Utah, indicate unusual properties which strongly influence certain wireline logging responses. Those logging parameters considered include density, gamma, relative dielectric constant, resistivity, and magnetic susceptibility. Two 160-ft cores, comprising the Mahogany Zone and an adjacent section approximately 40 ft above and below this unit, were cut, slabbed, and analyzed. Lithologically, the cores consist predominantly of laminated oil shale and marlstone with minor sandstone and altered tuff. Mineralogically, the oil shale contains dolomite, calcite, quartz, Na-feldspar, K-feldspar, smectite, illite, iron sulfides, and scattered siderite, aragonite, and analcime. Petrographic studies (thin section, SEM/EDS and XRD) indicate that iron sulfides occur both dispersed in the oil shale and concentrated along certain laminae. These iron sulfides, identified as pyrrhotite, pyrite, and marcasite, form blades, pods, cubes, and aggregates. In particular, pyrrhotite is highly conductive and magnetic and, when concentrated along thin, continuous laminae, markedly affects the electrical properties of the oil shale. Results of the study determined that the logging response reflects the bulk composition of the rock and is strongly influenced by the pyrrhotite-rich laminae and the amount of moisture in the shale.
- Research Organization:
- Texaco USA, Houston, TX
- OSTI ID:
- 6135935
- Report Number(s):
- CONF-870606-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:5
- Country of Publication:
- United States
- Language:
- English
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Conference
·
Thu Mar 31 23:00:00 EST 1983
· Oil Shale Symp. Proc.; (United States)
·
OSTI ID:5167184
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·
Fri Jun 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
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Technical Report
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Wed Dec 31 23:00:00 EST 1975
·
OSTI ID:7143937
Related Subjects
04 OIL SHALES AND TAR SANDS
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
GEOPHYSICAL SURVEYS
GREEN RIVER FORMATION
LIMESTONE
LITHOLOGY
MINERALOGY
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEISMIC SURVEYS
SURVEYS
USA
UTAH
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
GEOPHYSICAL SURVEYS
GREEN RIVER FORMATION
LIMESTONE
LITHOLOGY
MINERALOGY
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEISMIC SURVEYS
SURVEYS
USA
UTAH