Case study region The case study region for this work is the Eagle Ford Shale in south central Texas. Production wells in the Eagle Ford Shale include oil wells, wet gas (oil and gas production) wells, and dry gas wells. Data from 2012 and 2013 are used in the case study because of the availability of both a highly resolved methane emission inventory, evaluated using observational data , and a nearly contemporaneous gridded national methane emission inventory at a coarser spatial scale . Production in the Eagle Ford Shale in 2013, was 1 million barrels (bbl) of oil (approximately 160 million liters) and 4 billion standard cubic feet (scf) of gas per day (0.11 billion m 3 gas/day). The gas-to-oil ratio (GOR) of wells in the Eagle Ford ranged from less than 2000 to more than 50,000 scf/bbl . This diversity of production types makes the multiple sub-domains in the Eagle Ford representative of a wide range of production regions.