SHI Baoguang*, WANG Xiaofeng, XU Yongchang, and ZHEN Jianjing
The Key Laboratory of Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
Abstract As compared to the device developed by our predecessors, the newly developed adsorbed gas degasification-collection device has a series of advantages such as wide sample application range, large sample inlet, high vacuum, short-time sample smashing, low crushing temperature and water-free gas collection, which ensure the geochemical characteristics of acquired adsorbed gas samples to be the same as those of the adsorbed gases on corresponding hydrocarbon-source rocks. The results showed 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 their δ13C1–δ13C3 data, even δ13C4–δ13C5 data. The results of carbon isotope test and analysis satisfy the needs for the geochemical study and application of adsorbed gases. The above new techniques of experimental geochemistry are helpful for establishing the new direct natural gas-source correlation method, proving that the previous usual method of indirect natural gas-source correlation is scientific and authentic, thus providing the experimental basis for the study and application of adsorbed gases on hydrocarbon-source rocks.
* Corresponding author, E-mail: sbg168@hotmail.com
CHINESE JOURNAL OF GEOCHEMISTRY Vol. 32, No. 1, 2013, page 35-40
© Science Press and Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg 2013
