Land leased for oil and gas exploration and/or land containing underlying oil and gas or mineral rights. Annulus

A convex-upward formation of rock layers, which may form a trap for hydrocarbons. Appraisal Well

An underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt or clay) from which groundwater can be extracted using a water well. Azimuth

A unit of volume measurement used for petroleum and its products or water used or produced by the industry (1 barrel = 42 gallons).   Barrel of oil equivalent (BOE)

One billion cubic feet of natural gas. BCFE

Naturally-occurring, inflammable organiz matter formed from kerogen in the process of petroleum generation which includes hydrocarbons such as asphalt and mineral wax a sticky, black and highly viscous liquid or semi-solid form of petroleum. Blow-out preventers (BOPs)

  When well pressure exceeds the ability of the wellhead valves to control it. BOED

The hole in the earth created when drilling a well. Brine

The heat required to raise the temperature of a one-pound mass of water by one degree Fahrenheit. Butane

Capital expenditures. Carbon capture and storage (CCS)