[1] 1.Bjoroy M, et al. Stable carbon isotope ratio analysis on single components in crude oils by direct GC-isotope analysis.Trends in Analystical Chemistry. 1990. 9: 331一336.

2.Dai Jin Xing. General theory on the origin of the reversed order of carbon isotopes of alkane gases. Industry of Natrual gas. 1990. 10 (6).

3.Freeman K H. et al. Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons. Na-lure. 1990, 343: 254-256.

4.Hayes J M, et al. Isotopic compositions and probable origins of organic molecules in the Eocene Messel shale. Nature.1987. 329 : 48-51.

5.Hayes J M. et al. Compound-specific analysis: A novel tool for reconstruction oI ancient biogeochemical processes. Org.Geochem.,1990.16: 115-1128.

6.Lapton J E. Terrestrial inert gases isotope tracer studies and clues to primordial components in the mantle. Ann. Rev.Earth. Planet. Sri.,1983. 11:371-414.

7.Schoell M. The hydrogen and carbon isotopic composition of methane from natural gases of various origins. Geochimicaet Comochimica Acta. 1980. 44 (5).

8.Sofer I. et al. Isotopic composition of individual n-alkanes in oils. Org. Geochem.,1992. 18: 201-222.

9.Susumn Sakata, et al. Geochemical study on genesis of natural gases accumulated in deep volcaniclastic rocks: Journalof the Japanese Association for Petroleum Technology. 1986. 51 (3):33-41.

10.Xu Yongchang. et al. Isotopic geochemistry of noble gases from natural gases. Geochimica. 1979. (4):271-282.

11.Zhang Wenzheng. et al. Study on carbon isotopes of individual light hydrocarbons and n-alkane compounds form sever-al basins in China. Review of Geology. 1993. 39 (1):79-85.

12.Zhao Mengjun. et al. Study on carbon isotopic compositions of individual hydrocarbon compounds in crude oils. Explo-ration and Exploitation of Petroleum. 1994. (3):52-59.