Petrography and depositional systems of Tonkawa format interval (Virgilian), Woods County, Oklahoma
- K. Stewart Petroleum Corp., Oklahoma City, OK (USA)
The Tonkawa format is a carbonate-bounded genetic unit of regional scope that was deposited on the northern shelf of the Anardarko basin during the Late Pennsylvanian. A facies tract that includes fluvial-deltaic and slope terrigenous clastic depositional systems occurs between the format-bounding Haskell and Avant limestones. This interval records the southwestward progradation of a major high-constructive delta system from eastern Kansas. Sandstone units in the study area have been grouped into four vertical subintervals (packages) based on data from eight cross sections and 1,100 well logs. The lowest three packages contain most of the net sandstone thickness of the format; they represent episodes of deltaic lobe switching. Cores and wireline-curve characteristics indicate that barfinger, distributary-channel fill, crevasse-splay, marine reworked delta-front, and interdistributary-bay facies are prominent in Woods County. Higher, with the fourth package, delta-lobe destructive facies such as barrier sandstone units and transgressive sheet sandstones predominate. Updip stratigraphic pinch-out of bar finger crevasse splay and barrier-bar sandstones toward the northeast comprise the dominant hydrocarbon-trapping mechanism. Petrographically, the Tonkawa sandstone units may be defined as mature, fine sandstone, sublitharenite. Shale clasts and phyllite-schist grade grains are the most significant rock fragment components. Maximum porosity is roughly 14% and is wholly secondary. Authigenic calcite and calcite comprise the major pore-filling materials.
- OSTI ID:
- 5535265
- Report Number(s):
- CONF-8909245--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Vol. 73:8; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
DEPOSITION
FEDERAL REGION VI
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OKLAHOMA
OXYGEN COMPOUNDS
PENNSYLVANIAN PERIOD
PETROGRAPHY
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
USA
WELL LOGGING