July 22nd, 2019
Gas isotopes are a flexible tool, adding value in any phase of the upstream activity. For many years natural gas was primarily characterized simply by its chemical composition, the dry gas definition being a clear example of this. In the early 1980’s, the isotopic characterization of gas was extensively introduced, mainly to distinguish between a thermogenic or biogenic origin of the gas.
The increasing availability of isotopic gas composition data has revealed the ability to provide many additional key pieces of information, including gas maturity, gas provenance, migration patterns, the presence of common or differing sources for gas and oil coexisting within the same reservoir,
The figure below shows an example of a simple carbon isotope application: two gases in the same reservoir have different chemical composition; the Chung plot, obtained by using isotopic data, highlights that both gases have the same origin and characteristics, but that gas B has been contaminated by the presence of biogenic gas, probably trapped when reservoir was at a shallower depth. For more information, visit www.geolog.com
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