{"name":"Marathon Oil Company Drilling Activity in Niobrara County, Wyoming","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/marathon-oil-company/wyoming/niobrara","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-07-04","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Marathon Oil Company","operatorSlug":"marathon-oil-company","state":"WY","county":"Niobrara","totalWells":174,"producingWells":12,"permits24mo":0,"spuds24mo":0,"ducCount":139,"topFormation":"Niobrara- Mowry","rankInCounty":1,"firstPermitDate":"1917-11-30","lastPermitDate":"2017-08-09"}