Conduit system and formation mechanism of heat fluids in diapiric belt of Yinggehai basin, China |
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Authors: | Xinong Xie Sitian Li Xiangyun Hu Weiliang Dong Minqiang Zhang |
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Institution: | (1) Faculty of Earth Resources, China University of Geosciences, 430074 Wuhan, China;(2) China Offshore Petroleum Nanhai West Corporation, 524057 Zhanjiang, China |
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Abstract: | The conduit system of heat fluids in diapiric belt of Yinggehai basin is dominantly vertical faults and fractures. Detailed
research on the formation mechanism and their occurrence features shows that the faults and fractures can be classified into
three types: intrastratal dispersive hydrofracture, puncturing fault and upwarping-extensional fault. The development of the
fault and fracture system not only resulted in the changes of the temperature and pressure fields in the basin, but also affected
the hydrocarbon migration in the overpressured system. These faults and fractures constituted the main pathways for vertical
hydrocarbon migration, and opening and closing intermittently led to episodic expulsion of overpressured fluid compartment.
Thus there formed the pool-forming model of multi-source mixing and ploy-stage migration and accumulation for hydrocarbons
in the Yinggehai basin.
Project jointly supported by the Ministry of Science and Technology of China (Grant No.95-Pre-39) and the National Natural
Science Foundation of China (Grant No. 49732005), and A Hundred Excellent Researchers Foundation from the Ministry of Land
and Resources. |
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Keywords: | Yinggehai basin overpressured system hydrofracturing episodic hydrocarbon expulsion |
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