Three-dimensional fluvial architecture of the Gypsy Sandstone (Pennsylvanian), central Oklahoma

Conference · Fri Mar 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5738375

Doyle, J D; Sweet, M L; Thomas, K K ^[1]

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1. BP Exploration, Houston, TX (United States)

Exposures of the Virgilian-age Gypsy Sandstone west of Tulsa, Oklahoma, were used with shallow cores to determine the three-dimensional geometry of bounding surfaces and channel-fill complexes within a multistoried fluvial sand body. Individual fourth- and fifth-order bounding surfaces were initially mapped on two parallel 300-m-long road cuts using photomosaics. Fifth-order surfaces bound three large and three smaller channel-fill complexes. Vertical sequences within the larger channel-fill complexes typically consist, from the base up, of a 0.3-1 m thick lag of trough cross-bedded, granule- to cobble-sized mudstone intraclasts that grade up into 0.1-1.5 m thick trough sets of medium- to fine-grained sublithic arenite. This part of the sequence is often carbonate cemented. Planar and ripple-laminated fine sandstones occur near the top of the sequence. Some sequences are capped by red, root-mottled siltstone. Laterally, channel-fill complexes are either truncated by fifth-order bounding surfaces or thin into the adjacent red siltstone unit. Twenty-two shallow cores, spaced 30-60 m apart, were cut 5 to 245 m from the northern road cut. Fifth-order bounding surfaces associated with the three large channel-fill complexes could be recognized and correlated between cores and the road cuts. Third- and fourth-order bonding surfaces, while recognizable on the outcrop facies and in individual cores, could not be traced throughout the study area. Individual channel-fill complexes are up to 10 m thick and 100-250 m wide. They have a high degree of longitudinal continuity. Paleocurrent and other sedimentologic data suggest that, where they can be identified, macroforms, while lacking well-defined sigmoidal bedding, are lateral accretion deposits modified by chute channels.

• OSTI ID: 5738375
• Report Number(s): CONF-910403--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000* -- Geosciences
ALLUVIAL DEPOSITS
CARBONIFEROUS PERIOD
DEPOSITION
DEVELOPED COUNTRIES
DISTRIBUTION
DRILL CORES
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOLOGY
GEOMETRY
MAPPING
MATHEMATICS
MINERAL RESOURCES
NORTH AMERICA
OKLAHOMA
PALEOZOIC ERA
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SPATIAL DISTRIBUTION
STRATIGRAPHY
THREE-DIMENSIONAL CALCULATIONS
USA