Hydrocarbon potential of early mesozoic basins of eastern United States
Conference
·
OSTI ID:6083660
The exposed Triassic-Liassic rift basins in the eastern United States are half-grabens filled with up to 7 km of continental sediments. The location and sense of asymmetry of the half-grabens are closely tied to the structural grain of the Appalachian crystalline terranes on which they have formed. In many instances, the faulted margins of the basins are older thrusts or terrane boundaries reactivated as listric normal faults. The sediment fill of the basins reflects their structural asymmetry. Coarse alluvial fan deposits along the main border faults pass basinward into a complex assemblage of fluvial, paludal, and lacustrine facies. The oldest sediment fill in the rift basins is dated palynologically as late Ladinian to late Carnian. Perhaps reflecting the northward opening of the central Atlantic, the youngest rift-fill sediments are older in the southern basins than in the northern-Carnian in the Righmond basin vs. Toarcian in the Hartford-Deerfield basin. Floral evidence points to a tropical to near-tropical environment, with severe oscillations between xerophytic (dry) and hydrophytic (wet) conditions. The degree of thermal maturation, as estimated from vitrinite reflectance and clay mineralogy, varies widely from basin to basin; however, most of the basins are within the oil to dry gas generative window. The basins with highest thermal maturities are those having large volumes of diabase intrusives and presumed higher paleogeothermal gradients. The peak of thermal maturation/migration may have occurred as early as the Jurassic.
- OSTI ID:
- 6083660
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydrocarbon potential of early Mesozoic basins of eastern United States
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Conference
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Sun Jan 31 23:00:00 EST 1988
· AAPG Bull.; (United States)
·
OSTI ID:5793655
Paleopalynological biostratigraphy, organic matter deposition, and basin analysis of the Triassic-Jurassic Richmond Rift Basin, Virginia, USA
Thesis/Dissertation
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Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6827666
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Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:7033254
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