The present invention relates to {TAIL ~ natural gas} and oil well mud logging and coal bore hole logging, and more particularly to methods and apparatus for analyzing the composition of the hydrocarbon gases and {HEAD ~ vapors} entrapped in the drilling mud by measuring the absorption of various laser beams by the hydrocarbon gases and vapors 
The present invention relates to { TAIL ~ natural gas } and oil well mud logging and coal bore hole logging , and more particularly to methods and apparatus for analyzing the composition of the hydrocarbon gases and { HEAD ~ vapors } entrapped in the drilling mud by measuring the absorption of various laser beams by the hydrocarbon gases and vapors
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