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Geochemical characteristics of immature hydrocarbons of the Anjihai Depression in the Junggar Basin

Authors
Journal
Journal of Asian Earth Sciences
0743-9547
Publisher
Elsevier
Publication Date
Volume
5
Identifiers
DOI: 10.1016/0743-9547(91)90059-7
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract On the basis of organic studies, this paper presents the geochemical characteristics of immature crude oil and source rock from the Anjihai Depression, Junggar Basin. The vitrinite reflectivities ( R °) of Tertiary rock samples are less than 0.6% at depths of 3000–4000 m. Sterane αααC 29 S/( R + S) values range between 0.049 and 0.23, and C 29ββ/(ββ + αα) values range from 0.30 to 0.48 in the Tertiary rock samples. The above two ratios of the crude oils are 0.44 and 0.47 respectively. Ratios of Σ rearranged steranes and Σ total steranes are in the range of 0.02–0.15 for both crude oil and Tertiary rock samples. These results show that the Tertiary rock samples are in a lower evolutionary stage, and crude oils originating from the Tertiary system are immature.

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