Abstract: It will emphatically be discussed in the paper how to develop and expand gas chromatographical spectrometer s analysis function. Oil and disperse soluble organic matter extracted from the underground will directly be sampled into the gas chramatographical spectrometer once and comprehensively analyzed to determine heavy-light monomer hydrocarbon component, moreover,
the geologic significance is integratively discussed.

Key words: Chromatographic analysis, Light hydro carbon, Heavy hydro carbon