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Oil & gas

Terms concerning oil and gas as a fossil fuel and natural resource.

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thermal neutron absorber

Oil & gas; Oilfield

An element, or mineral, that is particularly effective in absorbing thermal neutrons (neutrons with about the same energy as the surrounding matter, typically less than 0. 4 eV). ...

chemical neutron source

Oil & gas; Oilfield

An encapsulated radioactive material that emits neutrons for use in neutron porosity measurements. The most common source relies on alpha-beryllium reactions in a 241 Am-Be ...

uranium

Oil & gas; Oilfield

An element with an atomic number of 92. The 238 U isotope is radioactive and decays with a half-life of 4. 4 * 10 9 years through a series of intermediate isotopes to a stable ...

thorium

Oil & gas; Oilfield

An element with an atomic number of 90. The 232 Th isotope is radioactive and decays with a half-life of 1. 4 * 10 10 years through a series of intermediate isotopes to a stable ...

potassium

Oil & gas; Oilfield

An element with an atomic number of 19. The 40 K isotope is radioactive, decaying with the emission of a single gamma ray of 1. 46 MeV with a half-life of 1. 3 * 10 9 years to ...

guard electrode

Oil & gas; Oilfield

An electrode on a laterolog sonde that focuses the current sent by the central current-emitting electrode (A0). The guard electrode is held at the same potential as A0, thereby ...

proximity log

Oil & gas; Oilfield

An electrode device with small spacings from which the current flow, and hence the measurement, is focused a short distance into the formation. The proximity log measures the ...