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Thermal maturity patterns (CAI and %R) in the Ordovician and Devonian rocks of the Appalachian basin in Pennsylvania

Open-File Report 2002-302

By:
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Abstract

The objective of this study is to enhance existing thermal maturity maps in Pennsylvania by establishing: 1) new subsurface CAI data points for the Ordovician and Devonian and 2) new %Ro and Rock Eval subsurface data points for Middle and Upper Devonian black shale units. Thermal maturity values for the Ordovician and Devonian strata are of major interest because they contain the source rocks for most of the oil and natural gas resources in the basin. Thermal maturity patterns of the Middle Ordovician Trenton Group are evaluated here because they closely approximate those of the overlying Ordovician Utica Shale that is believed to be the source rock for the regional oil and gas accumulation in Lower Silurian sandstones (Ryder and others, 1998) and for natural gas fields in fractured dolomite reservoirs of the Ordovician Black River-Trenton Limestones. Improved CAI-based thermal maturity maps of the Ordovician are important to identify areas of optimum gas generation from the Utica Shale and to provide constraints for interpreting the origin of oil and gas in the Lower Silurian regional accumulation and Ordovician Black River-Trenton fields. Thermal maturity maps of the Devonian will better constrain burial history-petroleum generation models of the Utica Shale, as well as place limitations on the origin of regional oil and gas accumulations in Upper Devonian sandstone and Middle to Upper Devonian black shale.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Thermal maturity patterns (CAI and %R) in the Ordovician and Devonian rocks of the Appalachian basin in Pennsylvania
Series title:
Open-File Report
Series number:
2002-302
Edition:
Online Version 1.2
Year Published:
2002
Language:
ENGLISH
Description:
57 p. (11 figures, 3 tables, 31 p. of text)