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The AAPG/Datapages Combined Publications Database
Dallas Geological Society
Abstract
Carbonates, Reefs and Evaporites
Oil Production from Devonian Carbonates in the Forest City Basin, Midcontinent, U.S.A.
Abstract
The Forest City Basin is a post-Mississippian tectonic feature including parts of Iowa, Kansas, Missouri and Nebraska. Seven fields in Nebraska and Kansas have a cumulative production value through 1986 of over 9,726,000 barrels of oil. Devonian rocks were deposited in the mid-Paleozoic North Kansas Basin which was bisected in Early Pennsylvanian time to form the Salina and Forest City basins. Rocks of Late Devonian age consist of a shale facies in the south which merges from the base upward into a northern carbonate facies. The oil reservoirs occur at this facies change in conjunction with several prominent structural trends. Oil is produced from depths ranging from 680-875 metres (2240-2870 feet). A strong water drive is present, but no associated gas. The reservoir rocks are vuggy, fractured dolomites with pay thicknesses up to 11 metres (36 feet).
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