Leroy developed the new MGIL technology in collaboration which integrates high density gas sampling with geological and engineering isotopic interpretive techniques. MGIL was developed to address missed-pay assessment, reservoir seal identification and compartmentalization, geochemical (source, maturity, migration) gas characterization on 'all' penetrated hydrocarbon zones, charged reservoir assessment, drilling problems resulting in multiple reservoir communication and down-dip oil prediction. The technique has seen enormous interest in petroleum exploration and production applications, and is now widely used by many major oil and gas corporations.