Implications to exploration of porosity relationships and paragenetic sequences, Jurassic Navajo (Nugget) sandstone, Utah, and southwestern Wyoming

Conference · Sun Jul 01 00:00:00 EDT 1984 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5662342

Uygur, K; Picard, M D

The authors have studied in outcrop and in the subsurface the reservoir characteristics and diagenesis of the Early Jurassic, eolian, Navajo (Nugget) Sandstone in Utah and southwestern Wyoming. Principal topics include: texture, framework constituents, intergranular and intragranular cements, matrix, directional porosity, porosity types, and hydraulic conductivity. Characteristics of the sandstone are related to variations in dune and interdune environments, fluctuating ground water chemistry, and postdepositional environments. Diagenesis, in which an open-system diagenetic model is considered, superimposes and is influenced by these variations and events. Compaction of the sandstone due to mechanical rearrangement of detrital grains and intergranular pressure solution played little or no role in modification of porosity or hydraulic conductivity. Likely, they account for not more than 5% of the porosity reduction. Greatest porosity reduction (16%) was by cementation. Present mean total porosity is 19%, ranging from 3 to 35%.

• Research Organization: Univ. of Utah, Salt Lake City
• OSTI ID: 5662342
• Report Number(s): CONF-8408161-
• Journal Information: Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 68:7; Conference: Energy and More in '84, Salt Lake City, UT, USA, 27 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
PETROLEUM DEPOSITS
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RESERVOIR ROCK
POROSITY
UTAH
WYOMING
DIAGENESIS
GEOLOGIC FORMATIONS
JURASSIC PERIOD
SANDSTONES
FEDERAL REGION VIII
GEOLOGIC AGES
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020200* - Petroleum- Reserves
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& Exploration