Keywords: 
• hydrocarbonsource rock

Abstract: As compared to the device developed by our predecessors, the newly established adsorbed gas degasificationcollection device has a series of advantages such as wide sample application range, large sample inlet, high vaccum, shorttime sample smashing, low crushing temperature and waterfree gas collection, which make sure the geochemical characteristics of acquired adsorbed gas sample is the same as the adsorbed gas on corresponding hydrocarbonsource rock. The results show that the acquired adsorbed gases are composed mainly of hydrocarbon gas and carbon dioxide gas, with the hydrocarbon gas accounting for more than 80%, and can be measured reliably for theirδ¹³C₁~δ¹³C₃ data, even δ¹³C₄~δ¹³C₅ data. The results of carbon isotope test analysis satisfy the needs for the geochemical study and application of adsorbed gases. The above new techniques of experimental geochemistry establish the new direct nature gassource correlation method, prove that the old usual method of indirect nature gassource correlation is scientific and authentic, and set up the experimental basis of the research and application of adsorbed gas on hydrocarbonsource rock.