Laminated black shale-chert cyclicity in Woodford Formation (Upper Devonian of southern Mid-Continent)
The Woodford formation, a known hydrocarbon source rock, is contemporaneous with other mid-Paleozoic (Frasnian to Tournasian) black shales occurring throughout North America and Europe. Much of the Woodford formation in outcrop along the southern flank of the Arbuckle uplift (Carter County, Oklahoma) consists of rhythmic alternating beds of laminated black shale and chert. A time series analysis of the chert-black shale couplets displays an approximately 20-ka periodicity, suggesting that deposition was controlled by external orbital forcing of the earth (Milankovitch cyclicity). Total organic carbon ranges from 3 to 9% in the chert and from 10 to 28% in the black shale; carbonate carbon content is essentially zero. Carbon isotope (/delta//sup 13/C = /minus/ 29 per mil), pyrolysis-gas chromatography, and Rock-Eval Analyses indicate that the kerogen is of marine origin and is oil-prone type II. Except for the difference in organic carbon contents, the kerogens of the chert-black shale couplets are analytically similar.
- Research Organization:
- Univ. of Texas at Dallas, Richardson (USA)
- OSTI ID:
- 5797243
- Report Number(s):
- CONF-880301-
- Journal Information:
- AAPG Bull.; (United States), Journal Name: AAPG Bull.; (United States) Vol. 72:2; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
BITUMINOUS MATERIALS
BLACK SHALES
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHATTANOOGA FORMATION
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
FEDERAL REGION VI
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
ISOTOPE RATIO
ISOTOPES
KEROGEN
LIGHT NUCLEI
MATERIALS
MINERAL RESOURCES
NORTH AMERICA
NUCLEI
OIL SHALES
OKLAHOMA
ORGANIC MATTER
PETROLEUM DEPOSITS
PYROLYSIS
RESOURCES
SEPARATION PROCESSES
SOURCE ROCKS
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
USA