Sedimentology, petrology and x-ray mineralogy of Coniacian-Santonian Niobrara shale, northeastern San Juan basin, New Mexico

Conference · Fri Sep 01 04:00:00 EDT 1989 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5699481

Cole, R D; Allmaras, J M; Zager, J P; Moore, G E ^[1]

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1. 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--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 73:9
• Country of Publication: United States
• Language: English

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02 PETROLEUM
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ALKALINE EARTH METAL COMPOUNDS
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CALCIUM CARBONATES
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CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CLAYS
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