Abstract
The geochemical characteristics of crude oils from Zao-V oil measures in the Shenjiapu oilfield are systematically described in terms of the fractional composition of crude oils, GC characteristics of saturated hydrocarbon fraction of crude oils and the characteristics of their bio-markers. The depositional environment, type and evolution of the biological source are also discussed. All pieces of evidence such as low saturated hydrocarbon fraction, high resin and asphalt, high isoprenoid alkane, weak odd-carbon number predominance ( CPI ranging from 1.23 to 1.29, OEP ranging from 1.14 to 1.16) and low sterane and terpane maturity parameters show these crude oils are immature oils. Low Pr/Ph ratios (0.66–0.88) and high gammacerance/C31 hopane ratios (0.59–0. 86) indicate the source rocks were formed in a slightly saline to brackish reducing lake depositional environment. Gas Chromatographic characteristics of the saturated hydrocarbon fraction and the predominance of C30 hopane in terpane series and C29 sterane in sterane series indicate the biological source of the crude oils is composed mainly of bacterial and algal organic matter, and some algae are perhaps the main contributor of organic matter to the source rocks.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Czochanska, Z., T. D. Gilbert, R. P. Philp et al., 1988, Geochemical application of sterane and triterpane biomakers to a description of oils from the Taranaki Basin in New Zealand [J]: Organic Geochemistry, v. 12, p. 123–135.
Hou Dujie, Wang Tieguan, Kong Qingyun et al., 1999, Geochemical characteristics of crude oils in Chaochang region [J]: Journal of the University of Petroleum, China (Edition of Natural Science), v.23, n.2, p.27–29 (in Chinese).
Ourisson, G., P. Albrecht, and M. Rohmer, 1979, The hopanoids, palaeochemistry and biochemistry of a group of natural products [J]: Pure and Applied Chemistry, v. 51, p. 709–729.
Peters, K. E. and J. M. Moldoman, 1993, The biomaker guide, interpreting molecular fossils in petroleum and ancient sediments [M]: New Jersey, Prentice-Hill, 363p.
Sinninghe Damste, J. S., F. Kenig, M. P. Koopmans et al., 1995, Evidence for gammacerane as an indicator of water column stratification[J]: Geochim. Cosmochim. Acta, v.59, n.9, p. 1895–1990.
Volkman, J. K., F. T. Gillan, R. B. Johns et al., 1981, Sources of neutral lipids in a temperate intertidal sediment [J]: Geochimica et Cosmochimica Acta, v.45, p. 1817–1828.
Wang Tieguan, Zhong Ningning, Hou Dujie et al., 1995, The distribution and formation mechanism of immature oil & gas [M]: Beijing, Petroleum Industry Press, 235p. (in Chinese)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wei, Y., Renzi, L. & Shuangyun, L. Geochemical characteristics of crude oils from Zao-V oil measures in Shenjiapu oilfield. Chin. J. Geochem. 22, 381–386 (2003). https://doi.org/10.1007/BF02840412
Issue Date:
DOI: https://doi.org/10.1007/BF02840412