The Niobrara Petroleum System of the U.S. Rocky Mountain Region is a major tight petroleum resource play. The system is self-sourced and reservoirs are low permeability chalks, calcareous shales, and sandstones. Source beds have total organic carbon contents that range from 2 to 8 weight percent. Source beds are thermally mature in the deeper parts of many of the Laramide basins in the Rocky Mountain region. Continuous or pervasive accumulations occur in thermally mature areas and in localized structural traps. Natural fractures are commonly associated with productive zones. Three papers comprise this special section.

O’Neal and Sonnenberg explain that the...

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