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Gamma Ray

Minute quantities of radiation emitted by substances that are radioactive. Subsurface rock formations emit radiation quantum that can be detected by well-logging devices and that indicate the relative densities of the surrounding rock.

Gas

A combustible or non-combustible fluid produced in a natural state from the earth and which maintains a gaseous or rarefied state at ordinary temperature and pressure conditions.

Gas Cap

The portion of an oil reservoir occupied by free gas.

Gas-cap Drive

A type of primary reservoir drive, in which expansion of a gas cap forces oil out of the reservoir and into the well bore.

Gas Cut

Adjective applied to oil or mud which is mixed with some gas on a drill stem test or completion test.

Gas Lift

A secondary recovery method in which high pressure gas is injected into test wells in order to displace oil to production wells.

Gas-oil Ratio

The number of cubic feet of natural gas produced with a barrel of oil (GOR).

Geologist

A scientist whose speciality consists of procurement and interpretation of data pertaining to the earth’s crust.

Geophysics

The science involving the measurement and recording of certain physical properties in the outer surface of the earth in order to determine that nature and contour of underground geologic horizons. (Magnetics, gravimetrics and seismic).

Gun Perforation

A well completion method in which holes are made through casing and cement into the adjoining formation by the firing of steel bullets from a perforating gun.

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