Michigan Dept. of Environment, Great Lakes, and EnergyProducing oil and gas fields are symbolized based on their producing formation(s). Antrim Shale formation is unique in that it uses county-wide field designations. Updates will provided on an as needed basis. For more information, visit Michigan.gov/EGLE/Maps-Data/GeoWebFace or contact EGLE-GeoWebFace@michigan.gov . Field Name Field Descriptions ObjectID ESRI ID Number FieldNumber Field Number FieldName Field Name ProducingFormationName Producing Formation Name ProducingFmCode Producing Formation Code FieldType Type of Field code: OG: Oil and Gas G: Gas O: Oil GS: Gas Storage GC: Gas Condensate UNK: Unknown DiscoveryAPI 14 Digit api field discovery well DateDiscovered Date field discovered DateAbandoned Date field abandoned GlobalID ESRI ID NumberArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/cd058ffab22b47508e69d3c2a8eddbc9_12engState of Michigan Open Data PortalPublicMichigan Oil and Gas Fields By Formation [Michigan]Web servicesMichiganLast Modified: 2025-09-24