Online map system that shows oil and gas fields and wells in Ohio, using data obtained primarily from well card records on file with the Ohio Department of Natural Resources, Division of Geological Survey. Additional data for more recent wells (since 2001) were obtained from the Division of Mineral Resources Management.

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While the information presented is periodically updated as new information becomes available, the Division of Geological Survey estimates that there may be as many as 40,000 wells in Ohio for which the Division has no identified/located record.