Natural Gas Taxonomy


Natural Gas Taxonomy

CETI 15-020

Authors: John J. Carroll, Gas Liquids Engineering

Volume 2, Number 3

Air, volcanic gases, swamp gas, subsea vents, etc. are gases that are natural but the term “natural gas” is reserved for those gases found in subsurface reservoirs and usually are rich in hydrocarbons. Natural gas is commonly associated with petroleum. However, there are many kinds of natural gas. How can we classify them? In particular how does this classification improve our understanding? There is no strict classification system for the various forms of natural gas, but what is presented here are some guidelines based on the author’s experience and common industry practices. 

By analogy to the biological world, if all gases are the kingdom and natural gas is our phylum, then the classes of natural gas would be sweet, sour and acid. Thus, this will be our starting point…

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