Abstract
Bicyclic sesquiterpenoids are mostly used to illustrate the origins of organic matter and genetic types of crude oil presently. In this paper, the relationship between distributions and compositions of C16 homodrimane in immature to mature source rocks and evolution of organic matter was studied, and the correlation between C16 homodrimane at immature to low mature stages and thermal evolution of organic matter was analyzed. The results show that in terrestrial facies depositional system, the ratio of 8α(H)-homodrimane to 8β(H)-homodrimane has a high sensitivity about the maturity’s minor changes at immature to low mature stages. It is found that when the vitrinite reflectance R 0<0.7%, the ratio significantly decreases with increasing burial depth or maturity. This kind of phenomenon reveals that these parameters may be the useful maturity indicators for determining the relative maturation of organic matter at immature to low mature stages, and have certain practical value in biogeochemical and environmental geochemical research on low mature oil and gas.
Similar content being viewed by others
References
Bao Jianping, Wang Tieguan, and Wang Jinyu (1996) Organic Geochemistry of Mesozoic and Paleozoic Marine Source Rocks from the Lower Yangtze Area [M]. pp.29–32. Chongqing University Press, Chongqing (in Chinese).
Dimmler A., Cyr T.D., and Strausz O.P. (1984) Identification of bicyclic terpenoid hydrocarbons in the saturate fraction of Athabasca oil sand bitumen [J]. Org. Geochem. 7, 231–238.
Noble R.A. (1986) Geochemical Study of Bicyclic Alkanes and Diterpenoid Hydrocarbons in Crude Oils, Sediments and Coals [D]. pp.365. Ph. D. Thesis. University of Western Australia, Crawley.
Peters K.E. and Moldowan J.M. (1993) The Biomarkers Guide: Interpreting Molecular Fossils in Petroleum and Ancient Sediments [M]. pp.166–167. Prentice Hall, Englewood Cliff (New Jersey).
Philp R.P., Gilbert T.D., and Friedrich J. (1981) Bicyclic sesquiternoids and diterpenoids in Australian crude oils [J]. Geochim. et Cosmochim. Acta. 45, 1173–1180.
Wang Liqun, Bao Jianping, and Ma Dade (2005) Distributions and compositions of sesquiterpanoids and thermal maturation of organic matter in the low mature source rocks [J]. Geochimica. 34, 173–179 (in Chinese with English abstract).
Weston R.J., Philp R.P., Sheppard C.M., and Woolhouse A.D. (1989) Sesquiterpanes, diterpanes and other higher terpanes in oils from the Taranaki Basin of New Zealand [J]. Org. Geochem. 14, 405–421.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Bing, P., Cao, S., Lu, J. et al. Characteristic of homodrimane and maturity of organic matter in the low mature source rocks. Chin. J. Geochem. 31, 187–190 (2012). https://doi.org/10.1007/s11631-012-0566-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11631-012-0566-2