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Accumulation
accumulation of hydrocarbons

Acquisition
in exploration & production sector: generating and recording of seismic data

API gravity
specific density scale developed by the American Petroleum Institute (API) for measuring the density of petroleum. Liquid oil having 28° API or higher is generally known as light-weight crude

Appraisal of reserves
during appraisal the geology of the reservoir is defined. Appraisal immediately follows successful exploratory drilling and is made mainly by drilling one or more appraisal wells

Appraisal well
a well (often more than one) drilled after successful exploratory drilling and hydrocarbon discovery. Appraisal wells help better understand the geology of the reservoir and locate production wells

Artificial lift
a system that is intended to improve and enhance production from the well