Gas Analyses

GeoMark's standard gas analysis program consists of gas chromatographic measurement of the detailed gas composition as well as carbon and hydrogen stable isotope ratios.

The composition analyses measure nitrogen, carbon dioxide, hydrogen sulfide, methane, ethane, propane, iso- and normal butane, iso- and normal pentane, hexane, and higher molecular weight components (up to C12 if present). A GV GC-IRMS is used to measure the d13C composition of methane, ethane, propane, and the butanes, as well as CO2. The procedure couples a gas chromatograph to a combustion interface and an isotope ratio mass spectrometer (IRMS). The technique oxidizes gas components to CO2 and measures the 13C to 12C ratio of the individual gases. For stable hydrogen isotope ratios, the natural gas components are pyrolyzed to H2 prior to entering the IRMS. This provides a detailed "fingerprint" of the gas in the reservoir assuming higher molecular weight homologues are present in more than trace concentrations. Data for very dry gases will be limited to bulk composition, and stable hydrogen and carbon isotope composition of methane.

Download a price schedule

For more information on Gas Analyses please contact us.