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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 3    March 2016

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Oil source and migration process in oblique transfer zone of Fushan Sag, northern South China Sea
WANG Guan-hong(王观宏)1, 2, WANG Hua(王华)1, 2, GAN Hua-jun(甘华军)1, 2, SHI Yang(时阳)3, ZHAO Ying-dong(赵迎冬)2, CHEN Shan-bin(陈善斌)2

1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education
(China University of Geosciences), Wuhan 430074, China;
2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;
3. Exploration and Development Corporation, PetroChina, Guangzhou 510000, China

Abstract:The oblique transfer zone in the Fushan Sag, a syndepositionaldome sandwiched between the Bailian and Huangtong sub-sags, has been the most important exploration target. The major oil observation occurs in the and the . 46 oil and rock samples reveal that the oil in the transfer zone is mostly contributed by the Bailian sub-sag, though the source rock conditions, hydrocarbon generation and expulsion histories of the Bailian and Huangtong sub-sags are similar. The oil, characterized by high maturity, Pr/Ph ratio and oleanane/C30-hopane ratio, shows a close genetic affinity with the source rocks, while the oil, characterized by lower maturity, Pr/Ph ratio and oleanane/C30-hopane ratio, is suggested to be derived from the source rocks. The homogenization temperatures of aqueous fluid inclusions, taking the burial history of the reservoirs into account, reflect that the oil charge mainly occurred from mid-Miocene to Pliocene in the oblique transfer zone. The oil transporting passages include connected sand bodies,unconformities and faults in the Fushan Sag. Of these, the faults are the most complicated and significant. The faults differ sharply in the west area, the east area and the oblique transfer zone, resulting in different influence on the oil migration and accumulation. During the main hydrocarbon charge stage, the faults in the west area are characterized by bad vertical sealing and spatially dense distribution. As a result, the oil generated by the Huangtong source rocks is mostly lost along the faults during the vertical migration in the west area. This can be the mechanism proposed to explain the little contribution of the Huangtong source rocks to the oil in the oblique transfer zone. Eventually, an oil migration and accumulation model is built in the oblique transfer zone, which may provide theoretical and practical guides for the oil exploration.

 

Key words: oblique transfer zone; oil-source correlation; oil loss; oil migration and accumulation model; Fushan Sag

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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