Abstract
The Sangonghe Formation in Mahu sag of Junggar basin is a new target for middle and shallow oil and gas exploration. In order to study the geochemical characteristics of crude oil from the Sangonghe Formation, typical oil sand samples from the Sangonghe Formation in the Mahu Sag and Xiayan High in the east were selected, and the group composition, saturated hydrocarbon chromatography, and GC-MS tests were carried out for the oil sand extracts. The origin and maturity of crude oil, as well as the depositional environment and sources of hydrocarbon-generating parent material, are studied. The results show that the carbon isotope composition of crude oil from the Sangonghe Formation is lighter (δ13C value is about −30‰). The oil group composition from the Sangonghe Formation has high content of saturated hydrocarbon. Part of the shallowly buried crude oil was affected by secondary effects such as biodegradation, and its saturated hydrocarbon content is relatively low. The normal alkanes in crude oil all show low-carbon advantage (nC17, nC19). The values of C29 sterane ββ/(αα + ββ) and C29 sterane 20S/(20S + 20R) are greater than 0.45, which indicates mature crude oil. The Pr/Ph value is between 0.58 and 1.12. Crude oil contains a certain amount of gammacerane and β-carotane, indicating that the hydrocarbon-generating parent material was deposited in the reducing-weak reducing environment, and the water body had a certain salinity. The distribution and composition of steroids and terpanes in crude oils from the Sangonghe Formation in Mahu sag and Xiayan High are similar. The ααα-20R regular steranes of C27, C28 and C29 show an inverse “L” distribution. Tricyclic terpenes are mainly C20, C21, C23. The high content of C20, C21, C23 tricyclic terpenes and abundant C29 steranes came from the contribution of microorganisms and algae. The crude oils have the same source of parent material.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Lei, D., Chen, G., Liu, H., et al.: Sturdy on the forming conditions and exploration fields of the Mahu Giant oil (gas) province, Junggar Basin. Acta Geol. Sin. 91(7), 1604–1619 (2017)
Lei, D., Qu, J., An, Z., et al.: Hydrocarbon accumulation conditions and enrichment regularity of low-permeability glutenite reservoirs of Baikouquan formation in Mahu sag, Junggar Basin. Xinjiang Pet. Geol. 36(6), 642–647 (2015)
Yang, B., Jiang, Z., Li, J., et al.: Petroleum Geochemistry of the Junggar Basin, pp. 60–80. Gansu Science and Technology Press (1992)
Wang, X., Zhi, D., Wang, Y., et al.: Source Rocks and Oil-Gas Geochemistry in Junggar Basin. Petroleum Industry Press (2012)
Song, T., Huang, F., Wang, S., et al.: Characteristics and exploration potential of Jurassic oil and gas reservoirs in Mahu sag of the Junggar Basin. China Pet. Explor. 24(3), 341–350 (2019)
Chen, J., Wang, X., Deng, C.,et al.: Oil and gas source, occurrence and petroleum system in the Junggar Basin, Northwest China. Acta Geologica Sinica 90(03), 421–450 (2016)
Wang, G., Wang, Y., Li, E., et al.: Molecular and carbon isotopic compositions of oil components in the Baikouquan formation oil-bearing reservoir rocks on the western slope of the Mahu sag, Junggar Basin. Geochemica 46(03), 276–291 (2017)
Jiang, W.M., Li, Y., Xiong, Y.Q.: Source and thermal maturity of crude oils in the Junggar Bsin in northwest China determined from the concentration and distribution of diamondoids. Org. Geochem. 128(2), 148–160 (2019)
Liu, D., Zhou, L., Li, S., et al.: Characteristics of source rocks and hydrocarbon generation models of Fengcheng formation in Mahu depression. Acta Sedimentol. Sin. 38(05), 946–955 (2020)
Huang, P., Ren, J., Li, E., et al.: Biomarker andcarbon isotopic compositions of source rock extracts and crude oils from Mahu sag, Junggar Basin. Geochimica 45(03), 303–314 (2016)
Chen, Z., Wang, X., Deng, C., et al.: Geochemical features of source rocks and crude oil in the Junggar Basin, Northwest China. Acta Geologica Sinica 90(2), 37–67 (2016)
Wang, W., Xu, Y.,Manfred, S., et al.: Kerogen hydrocarbon isotope geochemistry for different depositional environments and maturity. Acta Sedimentologica Sinica 15(supplement), 133–137 (1997)
De Grande, S.M.B., Neto, F.R.A., Mello, M.R.: Extended tricyclic terpanes in sediments and petroleums. Org. Geochem. 20(7), 1039–1047 (1993)
Chen, Z., Liu, G., Wei, Y., et al.: Distribution pattern of tricyclic terpanes and its influencing factors in the Permian source rocks from Mahu depression in the Junggar Basin. Oil Gas Geol. 38(02), 311–322 (2017)
Philp, R.P.: Fossil Fuel Biomarkers-Application and Spectra. Elsevier, Berlin (1985)
Moldowan, J.M., Seifert, W.K., Gallegos, E.J.: Realtionship between petroleum composition and depostional environment of petroleum source rocks. Am. Assoc. Pet. Geol. Bull. 99, 1255–1268 (1985)
Volkman, J.K., Barrell, S.M., Blackbum, S.I., et al.: Microalgal biomarkers: a review of recent research developments. Org. Geochem. 29, 1163–1179 (1998)
Song, C., Wang, J., Fu, X., et al.: Geochemical characteristics and the significant of the upper Triassic hydrocarbon source rocks of the Bagong formation in the eastern Qiangtang Basin. J. Northeast Pet. Univ. 42(5), 104–114 (2018)
Mackenzie, A.S., Patience, R.L., Maxwell, J.R., et al.: Molecular parameters of maturation in the Toarcian shales Paris Basin, France-I. Changes in the configuration of acyclic isoprenoid alkanes, sterances, and triterpanes. Geochimica et Cosmochimica Acta 44, 1709–1721 (1980)
Acknowledgments
The project is supported by the national science and technology major project during the “13th Five Year Plan” (2017ZX05001-002-006).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2022 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Xu, Qx. (2022). Geochemical Characteristics of Crude Oil from Jurassic Sangonghe Formation in Mahu Sag, Junggar Basin. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2021. IFEDC 2021. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2149-0_443
Download citation
DOI: https://doi.org/10.1007/978-981-19-2149-0_443
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-19-2148-3
Online ISBN: 978-981-19-2149-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)