Operator’s development plan for an offshore installation. It requires government approval before it can be implemented.

An oil and/or gas field judged to be capable of producing enough net income to make it worth developing.

To cease work on a well which is non-productive, to plug off the well with cement plugs and salvage all recoverable equipment. Also used in the context of field abandonment.

Natural gas produced with crude oil from the same reservoir.

A well drilled as part of an appraisal drilling programme which is carried out to determine the physical extent, reserves and likely production rate of a field.

Natural gas associated with oil accumulations, which may be dissolved in the oil at reservoir conditions or may form a cap of free gas above the oil.

A unit of volume measurement used for petroleum and its products (7.3 barrels = 1 ton: 6.29 barrels = 1 cubic metre).

One barrel of oil; 1 barrel = 35 Imperial gallons (approx.), or 159 litres (approx.); 7.5 barrels = 1 tonne (approx.); 6.29 barrels = 1 cubic metre.

Billion cubic feet; 1 bcf = 0.83 million tonnes of oil equivalent.

Billion cubic metres (1 cubic metre = 35.31 cubic feet).