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1995 National Oil and Gas Assessment Province Boundaries

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: August 29, 2026 at 06:38 PM | Dataset Last Updated: August 26, 2026 at 12:00 AM
The USGS Central Region Energy Team assesses oil and gas resources of the United States. The onshore and State water areas of the United States comprise 71 provinces. Within these provinces, hydrocarbon plays were defined and assessed. Each of these provinces is defined geologically, and most province boundaries are defined by major geologic changes. The province boundaries were drawn on the county lines that most closely followed the natural geologic boundaries.

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