Stone Energy Corp is an upstream oil and gas company that operates in the Gulf of Mexico and the Appalachian regions of the United States. Its operations include the acquisition, exploration, development, and production of oil and natural gas fields. In its Gulf of Mexico operations, the company produces oil and gas from onshore wells, offshore conventional shelf wells, and deep water wells. In the Appalachian region, much of its oil and gas production comes from shale drilling. Overall, oil production accounts for the majority of revenue, while natural gas production accounts for a smaller portion. The company's customers include downstream refineries that purchase Stone Energy's crude oil and natural gas.