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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 55 (2005), Pages 39-46

Wilcox Group Coal-Bed Methane in North-Central Louisiana

F. Clayton Breland Jr., Peter D. Warwick


Significant coal-bed Previous HitgasNext Hit resources may exist in subsurface Wilcox Group (Paleocene-Eocene) coal beds that are found across much of north-central Louisiana. About a dozen wells recently completed in Wilcox Group coal zones in this area have an initial production that ranges from 7 to 229 thousand cubic feet (Mcf) of Previous HitgasNext Hit per day. Production of saline water from these wells ranges from 0 to 550 barrels (bbls) per day. Depth to the targeted Wilcox coal beds, which have a maximum thickness of about 20 ft, ranges from 1,500 to 5,000 ft. The thickest coal beds tend to be in the lower Wilcox coal zone. Cumulative Wilcox coal thickness can exceed 100 ft. Measured Previous HitgasNext Hit content of the coal beds ranges from less than 40 standard cubic ft per ton (scf/t, raw basis; or 65 scf/t dry, ash free basis, daf) at depths less than 1,600 ft, to greater than 158 scf/t (213 scf/t daf) in deeper (>2,700 ft) parts of the basin. Although geochemical and petrographic data from Wilcox Group coals from across the region show that the coal beds are lignite in rank at depths less than about 350 ft, they reach a rank of subbituminous B, or greater, at depths of approximately 2,500 ft. Preliminary Previous HitgasNext Hit isotope data indicate that Wilcox coal Previous HitgasTop originated from the microbial reduction of CO2 and that, in some places, these gases may be mixed with migrated thermal gases.

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