Oil and gas data from Paleozoic rocks in the Appalachian basin: maps for assessing hydrocarbon potential and thermal maturity

Book · Sat Dec 31 23:00:00 EST 1977

OSTI ID:6296338

Epstein, J B; Harris, A G; Harris, L D

Conodont color alteration index (CAI) isograd maps and overburden isopach maps are provided for 3 stratigraphic intervals in the Appalachian basin-Ordovician, Silurian through Middle Devonian, and Upper Devonian through Mississippian. Isograds follow isopach trends throughout the basin; both increase eastward. The CAI 2 isograd lies near the eastern limit (cutoff) of oil production for each stratigraphic interval. Gas production shows less relation to isograds because gas generation occurs over a very broad thermal range and its production depends mostly on primary and (or) secondary porosity and permeability. However, the CAI 4 isograd approximates the eastern limit of gas production over large areas of the basin because the temperature necessary to produce this high level of organic diagenesis concurrently produces mineral metamorphism that reduces porosity and permeability.

• OSTI ID: 6296338
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
APPALACHIA
DATA
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
INFORMATION
MAPS
MINERAL RESOURCES
NATURAL GAS
NATURAL GAS DEPOSITS
NORTH AMERICA
PETROLEUM
PETROLEUM DEPOSITS
PRODUCTION
RESOURCE POTENTIAL
RESOURCES
STRATIGRAPHY
USA