Sedimentology, petrology and x-ray mineralogy of Coniacian-Santonian Niobrara shale, northeastern San Juan basin, New Mexico
- Unocal Corp., Casper, WY (USA)
This study involves 12 Niobrara cores taken from two wells in Rio Arriba County, New Mexico. Analytical techniques included core logging (312 ft; 95 m) x-ray diffraction (199 analyses), petrography (124 analyses), and electron microprobe (six analyses). Cores are dominated by calcareous silty claystone with subordinant amounts of very fine-grained calcareous sandstone, bentonite, wackestone, and sparite. Sedimentary structures include horizontal lamination and lenticular, wavy, and ripple lamination in sandy core intervals. Burrowing is rare. Framework grains (0-45%) range in size from 40 to 100 {mu} and are composed of quartz, feldspar, chert, and allochemical grains with traces of muscovite, heavy minerals, phosphate, and glauconite. Cement components (2-91%) include calcite, ferroan calcite, dolomite, ferroan dolomite/ankerite, and rare quartz, kaolinite, and pyrite. Matrix components (7-98%) include siliciclastic clay, micrite, and diffuse mixtures of mud and organic matter. Clay minerals include illite-smectite and illite, with subordinant amounts of chlorite and kaolinite. Porosity (plug analyses) rarely exceeds 1%, and permeability averages less than 0.01 md. Fractures in core range in width from 0.1 to 1.5 mm and are cemented by ferroan calcite.
- OSTI ID:
- 5699481
- Report Number(s):
- CONF-8910195--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Vol. 73:9; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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020200* -- Petroleum-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CLAYS
DIAGENESIS
DOLOMITE
ELECTRON MICROSCOPY
FEDERAL REGION VI
FELDSPARS
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MICA
MICROSCOPY
MINERAL RESOURCES
MINERALOGY
MINERALS
NEW MEXICO
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PETROGRAPHY
PETROLEUM DEPOSITS
POROSITY
QUARTZ
RESERVOIR ROCK
RESOURCES
SILICON COMPOUNDS
SILICON OXIDES
USA