THE DEVONIAN WOODFORD FORMATION:

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• THE DEVONIAN WOODFORD FORMATION
• SOURCE AND RESERVOIR?

PBGSP
Stephen C. Ruppel Bureau of Economic Geology The
University of Texas at Austin
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WOODFORD STRATIGRAPHY
SOUTHERN MIDCONTINENT
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MIDDLE DEVONIAN PALEOGEOGRAPHY
WESTERN HEMISPHERE
Panthalassia Ocean
LAURUSSIA
PaleoTethys Ocean
Permian Basin
Rheic Ocean
GONDWANA
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WOODFORD SUBCROP
SOUTHERN MIDCONTINENT
400 ft
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WOODFORD DEPTH
SOUTHERN MIDCONTINENT
-10,000 ft
-15,000 ft
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LOG EXPRESSION Permian Basin
Barnett
Miss. LS
Very High Gamma Ray Low Resistivity
Woodford
Thirtyone
Ector Co., TX
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WOODFORD FACIES
Mudstones
Laminated Burrowed
Miss. LS
Woodford
Fasken
Chaves Co., NM
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WOODFORD FACIES
Siltstones
Graded Bedding
Rippled
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STRATIGRAPHY FACIES
Black Mudstone Facies
Gray Siltstone Facies
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STRATIGRAPHY FACIES
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WOODFORD PALEOGEOGRAPHY
SOUTHERN MIDCONTINENT
Craton-derived Clastic Input along NW
Margin
Hemipelagic Muds
Deep Basin Upwelling (silica) along SW
Margin
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WOODFORD
TOTAL ORGANIC CARBON (TOC)
Cores Outcrops
From Comer (1991)
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KEY ISSUES WOODFORD

• Depth
• Thickness
• TOC
• Ro
• Facies
• Fractures
• Super and Subjacent Strata
• Log Characterization