Authorization For Expenditure. Required by investor or lender. Is a proposal which outlines the costs and expenses associated with an oil and gas project.

American Petroleum Institute.  The organization which sets unit standards in the oil and gas industry. Can also be used to describe an API specification such as the viscosity of the oil.

The Bakken Formation /ˈbɑːkən/ is a rock unit from the Late Devonian to Early Mississippian age occupying about 200,000 square miles (520,000 km2) of the subsurface of the Williston Basin, underlying [..]

One barrel. Equals 42 gallons of liquid, normally crude oil or natural gas liquids (see NGLs ).

One billion cubic feet of natural gas.

One billion cubic feet of natural gas equivalent.

United States Bureau of Land Management – The federal department that leases public land for exploration and production of minerals.

Barrel of oil equivalent.

Barrel of oil equivalent.

Barrel of oil equivalent per day. One barrel of oil is generally deemed to have the same amount of energy content as 6,000 cubic feet of natural gas.