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

John E. Repetski; Robert T. Ryder; John A. Harper; Michael H. Trippi

doi:10.3133/ofr2002302

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

Open-File Report 2002-302

By: John E. Repetski, Robert T. Ryder, John A. Harper, and Michael H. Trippi

https://doi.org/10.3133/ofr2002302

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Abstract

This report presents a series of new thermal maturation maps for Pennsylvania, based on conodont color alteration index (CAI) and vitrinite reflectance (%R_o). Also, RockEval and total organic carbon (TOC) data are included in the report. Two Paleozoic intervals were studied: Middle Ordovician carbonate rocks and Lower and Middle Devonian carbonate rocks and black shale. These intervals were chosen for several reasons: A) they represent target reservoir zones for most of the oil and gas exploration and drilling in Pennsylvania; B) they are stratigraphically near probable source rocks for the oil and gas; C) they include contiguous geologic formations that extend across most of Pennsylvania; D) they contain carbonate grainstone/packstone which give a reasonable to good probability of recovery of conodont elements from small samples of drill cuttings; and E) the Middle Devonian black shale contains large amounts of organic matter for geochemical analysis.

Suggested Citation

Repetski, J.E., Ryder, R., Harper, J., Trippi, M.H., 2002, Thermal maturity patterns (CAI and %Ro) in the Ordovician and Devonian rocks of the Appalachian basin in Pennsylvania (Online Version 1.2): U.S. Geological Survey Open-File Report 2002-302, Report: ii, 57 p.; 3 Tables, https://doi.org/10.3133/ofr2002302.

ISSN: 2331-1258 (online)

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Additional publication details
Publication type	Report
Publication Subtype	USGS Numbered Series
Title	Thermal maturity patterns (CAI and %Ro) in the Ordovician and Devonian rocks of the Appalachian basin in Pennsylvania
Series title	Open-File Report
Series number	2002-302
DOI	10.3133/ofr2002302
Edition	Online Version 1.2
Year Published	2002
Language	English
Publisher	U.S. Geological Survey
Description	Report: ii, 57 p.; 3 Tables
Country	United States
State	Pennsylvania