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Title: Gas Identification By Geochemical Fingerprinting
Author: Dennis D. Coleman
Source: American Gas Association 1987
Year Published: 1987
Abstract: Geochemical fingerprinting of natural gas involves determining a characteristic set of chemical and isotopic compositions that can be used to distinguish gases from different sources. Bacterial gases such as landfill gases, marsh gases, and the gases typically found in soils and ground water can be readily distinguished from pipeline gas or storage gas by carbon isotope analysis of methane. Petroleum related gases from different sources can also be differentiated through the use of chemical and isotopic analyses. Therefore, if pipeline gas is being stored in a producing area, geochemical fingerprinting can be used to distinguish storage gas from native gas and to identify gas that has migrated from the storage reservoir. In some cases, one can even distinguish old injection gas from recent injection gas.

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