Geochemistry and origin of oil from Cambrian and Ordovician reservoirs in eastern and central Ohio

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5681680

Ryder, R T ^[1]; Burruss, R C; Hatch, J R ^[2]

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1. Geological Survey, Reston, VA (United States)
2. Geological Survey, Denver, CO (United States)

Oil from stratigraphic traps along the Middle Ordovician Knox unconformity in Ohio was analyzed to determine its geochemical characteristics, source, and migration history. The following stratigraphic units were samples: Upper Cambrian( ) Rose Run Sandstone, sample number (n) = 7; Upper Cambrian Knox Dolomite, n = 6; Upper Cambrian Krysik sandstone, n = 1; and Middle Ordovician Black River Limestone, n = 1. These Ohio oils are geochemically similar to oils in North America that are correlated with Ordovician source rocks. Seventy-one core samples from Ohio and West Virginia were analyzed by Rock-Eval for total organic carbon (TOC) and pyrolysis products and by solvent extraction to evaluate the source of the Ohio oils. Three potential source-rock intervals were tested: (1) Middle and Upper Cambrian strata in the Rome trough, (2) the Middle Ordovician Wells Creek Formation and the equivalent part of the Beekmantown Group, and (3) the Middle and Upper Ordovician Antes Shale. The thermal maturity of many samples was too high to give T{sub max} values and to yield adequate solvent extracts for detailed characterization. The Antes Shale samples have moderate TOC values ({bar x} = 1.2, n = 12) and Rock-Eval production indices between 0.3 and 0.5 ({bar x} = 0.4) calculated from nine samples with TOC greater than 0.5. These geochemical characteristics, a stratigraphic position about 1,000 ft above the Knox unconformity, and a maximum burial depth of about 10,000 ft along the Ohio-West Virginia border suggests that the Antes Shale is the probable source rock for the Ohio oils.

• OSTI ID: 5681680
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:8; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
OHIO
PETROLEUM DEPOSITS
PETROLEUM
CHEMICAL COMPOSITION
ENVIRONMENTAL TRANSPORT
MATURATION
WEST VIRGINIA
CAMBRIAN PERIOD
GEOCHEMISTRY
GEOLOGIC HISTORY
HYDROCARBONS
ORDOVICIAN PERIOD
ORIGIN
RESERVOIR ROCK
SOURCE ROCKS
CHEMISTRY
DEVELOPED COUNTRIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
MASS TRANSFER
MINERAL RESOURCES
NORTH AMERICA
ORGANIC COMPOUNDS
PALEOZOIC ERA
RESOURCES
USA
020200* - Petroleum- Reserves
Geology
& Exploration
023000 - Petroleum- Properties & Composition