Marathon Oil Well Data & Production

About Marathon Oil

Marathon Oil is one of the largest operators in the Eagle Ford Shale, with a core position in Karnes, Gonzales, and Atascosa counties. Marathon operates approximately 5,100 wells in Texas, predominantly in the Eagle Ford's volatile oil window where well economics are strongest. Marathon was an early entrant to the Eagle Ford and has steadily drilled out its position with consistent execution. The company's Karnes County wells are among the most productive in the play, benefiting from optimal reservoir conditions in the oil window. Following ConocoPhillips' acquisition of Marathon Oil in 2024, the combined company has an even larger Eagle Ford position. Landmen working in the Eagle Ford core should expect to encounter Marathon leases and assignments throughout Karnes and Gonzales counties.

Key Operating Counties

Target Formations

Recent Activity

Marathon (now part of ConocoPhillips) continues active Eagle Ford development in Karnes and Gonzales counties, with recent permits for both Eagle Ford and Austin Chalk targets from existing pad infrastructure.

Searching Marathon Wells on MineralSearch

MineralSearch tracks 5,100 wells operated by Marathon Oil across Texas. Our database is sourced directly from Texas Railroad Commission filings and includes well locations, completion data, production records, and permit history. Search by operator name, API number, lease name, or county to find the specific wells you need.

Whether you are a landman verifying operator assignments, a mineral owner checking production on your leases, or an analyst evaluating Marathon's drilling program, MineralSearch provides the data without the enterprise price tag.