Abstract
The carbon isotopic compositions of individual terpenoids in the heavy oils from the Karamay oilfield were determined by using the method of enrichment of terpanes with molecular sieve 13X and GC-IRMS technique. The terpanes, selectively enriched from the biodegraded oils with molecular sieve 13X, can meet the demand of GC-IRMS analysis. The carbon isotopic compositions of the hopanoids (δ13C −31.7% —37.8%) infer that their main source is probably non-methanotrophic bacteria, and that the depositional environment of source rocks is a strongly reductive, rapidly depositional, and closed-semi-closed saline lagoon.
Similar content being viewed by others
References
Freeman, K. H., Hayes, J. M., Trendel, J. M.et al., Evidence from carbon isotope measurements from diverse origins of sedimentary hydrocarbons,Nature, 1990, 343: 254.
Collister, J. W., Summons, R. E., Lichtfouse, E.et al., An isotopic biogeochemical study of the Green River oil shale,Org. Geochem., 1992, 19: 265.
Schoell, M., McCaffrey, M. A., Fago, F.J.et al., Carbon isotope compositions of 28, 30-bionorhopanes and other biological markers in a Monterey crude oil,Geochim. Cosmochim. Acta, 1992, 56: 1391.
Dimmler, A., Strausz, O. P., Enrichment of polycyclic terpenoid, saturated hydrocarbons from petroleum by adsorption on zeolite NaX,J. Chromatogr., 1983, 270: 219.
Moldowan, J. M., Fago, F. J., Carlson, R. M. K.et al., Rearranged hopanes in sediments and petroleum,Geochim. Cosmochim. Acta, 1991, 55: 3333.
Freeman, K. H., The carbon isotopic compositions of individual compounds from ancient and modem depositional environments,Ph. D. Dissertation, Indiana University, Bloomington Inol., 1991.
Collister, J. W., Wavrek, D. A., δ13C composition of saturate and aromatic fractions of lacustrine oils and bitumens: evidence for water column stratification,Org. Geochem., 1996, 24(8/9): 913.
Editorial Group of “Petroleum Geology of China”,Petroleum Geology of China, Vol. 15,Xinjiang (Book 1),Junggar Basin (in Chinese), Beijing: Petroleum Industry Press, 1993.
Jiang Zhusheng, Perhydro carotenes in Karamay crude oil and their geochemical characteristics,Oil & Gas Geology (in Chinese), 1983, 4(2): 151.
Author information
Authors and Affiliations
About this article
Cite this article
Xiong, Y., Geng, A. & Liu, D. Carbon isotopic compositions of individual terpenoids in heavy oils from Karamay oilfield. Chin.Sci.Bull. 44, 256–259 (1999). https://doi.org/10.1007/BF02896287
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02896287