Woodford Shale
Oklahomas Premier Source Rock - Multi-Basin Oil and Gas Play
Location
Key Reservoir Properties
359-385 million years ago
Organic-rich siliceous shale
6,000 - 14,000 ft
200 ft
3-9%
42.0° API
11,000,000 acres
Executive Summary
The Woodford Shale is one of the most prolific source rocks in North America, underlying much of Oklahoma. With total in-place resources estimated at 830 TCF of gas and 250 billion barrels of oil, the Woodford represents an enormous hydrocarbon system.
Unlike single-basin plays, the Woodford produces across multiple geological settings including the Anadarko Basin (gas-condensate), Arkoma Basin (dry gas), and Ardmore Basin (oil-rich). Its the primary source rock for the high-profile SCOOP play.
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Historical Background
Development Timeline
- 1928: First Woodford well drilled
- 1939: Identified as major source rock
- 2004: Newfield begins horizontal drilling
- 2012: Continental Resources pioneers SCOOP play
- 2024: Combined SCOOP/STACK/Woodford ~600,000 bo/d + 4 Bcf/d
Geological Characteristics
Formation Properties
- Age: Late Devonian to Early Mississippian
- Thickness: 50-300 ft (varies by basin)
- Depth: 6,000-14,000 ft
- TOC: 3-15% (exceptional source rock)
- Silica Content: 60-80% (highly siliceous, brittle)
Drilling & Completion Economics
Estimated Well Costs (2024)
Production Decline Analysis
The Shale Decline Reality
While industry headlines tout record production, the underlying data reveals a critical truth: shale wells experience dramatic production declines that require constant drilling just to maintain output. This creates a "treadmill" effect where massive capital expenditure is needed simply to prevent production collapse.
Industry Expert Analysis
"New wells drilled in 2023 may ultimately produce roughly half of what new wells from 2019 will ultimately produce. The industry is sacrificing future production to maximize short-term output."
— Art Berman, Petroleum Geologist (40+ years experience)The Lateral Length Paradox
Since 2014, the industry has nearly tripled average lateral lengths from 5,000 ft to 14,000+ ft. While this increases initial production rates, it also accelerates decline—effectively using "wider straws" to drain reservoirs faster.
Key Investment Considerations
Decline Risks
- Hyperbolic Decline: 65-75% production loss in year 1 (vs 5-6% for conventional)
- Child Well Problem: 85% of new wells produce less than expected
- Inventory Exhaustion: Tier 1 acreage running out within 3-5 years
- Treadmill Economics: Continuous drilling required just to maintain output
Counter-Perspectives
- Technology continues improving operational efficiency
- Infill drilling potential may extend productive life
- Multi-zone development can maximize recovery
- Higher commodity prices improve economics on marginal wells
Decline Analysis Data Sources
- IEA - International Energy Agency, "The Implications of Oil and Gas Field Decline Rates" (2024)
- EIA - U.S. Energy Information Administration, Production Decline Curve Analysis
- SPE/JPT - Society of Petroleum Engineers, "Shale Wells Producing More Early On, Then Declining Faster Than Ever"
- Art Berman - Petroleum Geologist, artberman.com - Shale decline analysis
- David Hughes - Geoscientist, Post Carbon Institute - Shale production studies
- Goehring & Rozencwajg - Natural Resource Investors, Permian Basin analysis
- Novi Labs - Delaware Basin and shale well performance data
Remaining Potential & Future Opportunities
The Woodford remains an active play, though increasingly mature in core areas. Integration with overlying SCOOP/STACK targets offers multi-zone development opportunities.
Conclusion
The Woodford Shale represents one of Americas largest unconventional resource bases. While maturing, significant development opportunities remain in conjunction with SCOOP/STACK zones. Same decline characteristics apply.
Data Sources & References
- Oklahoma Geological Survey
- EIA
- USGS
Important Disclaimer
This geological review is provided for educational and informational purposes only. The author, Sean Pruitt, is not a licensed geologist. Information presented here has been compiled from publicly available sources including USGS reports, state geological surveys, academic publications, and industry data. Reservoir properties and production data represent ranges observed across productive areas and may vary significantly by location. Kingdom Exploration makes no representations or warranties regarding the accuracy, completeness, or reliability of this information for any specific purpose. This content does not constitute investment advice, geological consulting, or professional engineering recommendations. Investors and operators should conduct their own due diligence and consult qualified licensed professionals including petroleum geologists, reservoir engineers, and financial advisors before making any investment or operational decisions.
