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Title: Advances In The Use Of Geochemical Fingerprinting For Gas Identification
Author: Dennis D. Coleman
Source: American Gas Association 1994
Year Published: 1994
Abstract: Geochemical fingerprinting of natural gas involves conducting detailed chemical and isotopic analyses of gases from different sources to determine various characteristic parameters that will allow distinguishing these gases from each other. Carbon and hydrogen isotope analyses provides a particularly effective method of accomplishing this. Carbon and hydrogen each are made up of 3 naturally occurring isotopes, two stable isotopes and one radioactive isotope each. Determining the C/I2C and2HH ratios in hydrocarbons can generally allow distinguishing thermogenic gas from microbial gas and can be used to distinguish storage gas from native gas, and even to identify compartmentalization within one producing reservoir. Analysis of the two naturally occurring radioactive isotopes, l4C (radiocarbon) and3H (tritium), provides a definitive method if distinguishing thermogenic gases, such as pipeline gas and storage gas, from bacterially produced gases such as drift gas, marsh gas, landfill gas, and sewer gas. Because of the many different analytical parameters that can be measured on natural gas, geochemical fingerprinting is becoming an increasingly more powerful method for distinguishing gases from different sources.

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