GLOSSARY

American Petroleum Institute. API gravity is a standard method of measuring density of crude oils and is expressed in degrees

a well that is being drilled into a discovered hydrocarbon accumulation to further understand the extent and size of the accumulation – usually denoted by “name-2”, “name-3” etc. appraisal wells can be drilled either before or after an accumulation has been developed. an appraisal well usually has a chance of success greater than an exploration well but less than a development well.

Group of hydrocarbons of which benzene is the parent. They are called "aromatics" because many of their derivatives have sweet or aromatic odors.

a sulphate of barium used to add weight to drilling fluids

an oil field unit of volume. One barrel at standard conditions equals 158.9 litres