GLOSSARY

A violent explosion involving high-velocity pressure waves; in a gasoline engine, the spontaneous combustion of part of the compresses charge after spark occurs. Detonation usually produces a characteristic metallic sound, or knock.

The number of acres which are allocated or assignable to producing wells or wells capable of production

A mass of rock, usually salt, which has come from a slightly deeper part of the earth's surface by piercing through overlying layers of sediment through a zone of weakness

The technique of drilling at an angle from the vertical by deflecting the drill bit. Directional wells are drilled to develop an offshore lease from one drilling platform; to reach a pay zone where drilling cannot be done, such as beneath a shipping lane

The process of heating a liquid to its boiling point and condensing and collecting the vapors