The Permian Basin is an oil-and-gas-producing area located in West Texas and southeastern New Mexico and covers an area approximately 75,000 square miles. It is composed of more than 7,000 fields.

The Haynesville basin covers parts of east Texas and western Louisiana.  The Haynesville shale, for which it's named, is a hydrocarbon-producing geological formation capable of producing large amounts of gas. The productive interval of the shale is typically greater than 10,000 feet below the surface.

The Eagle Ford Basin is a hydrocarbon-producing geological formation that can produce both natural gas and oil. The shale play trends across Texas from the Mexican border into East Texas, roughly 50 miles wide and 400 miles long.

The Montney Formation is located in the Western Canadian Sedimentary Basin in British Columbia and Alberta.  It is a major shale gas and tight oil resource.

The Bakken Formation is a rock unit occupying about 200,000 square miles of the subsurface of the Williston Basin, underlying parts of Montana, North Dakota, Saskatchewan and Manitoba.