The present invention relates to 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 vapors entrapped in the drilling mud by measuring {TAIL ~ the absorption} of {HEAD ~ various laser beams} by the hydrocarbon gases and vapors 
The present invention relates to 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 vapors entrapped in the drilling mud by measuring { TAIL ~ the absorption } of { HEAD ~ various laser beams } by the hydrocarbon gases and vapors
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