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Volume 22 Issue 5
Oct 2011
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Journal of Earth Science  > 2011  >  22(5): 632-632.
Hao Xu, Dazhen Tang, Junfeng Zhang, Wei Yin, Xiaozhi Chen. Formation Mechanism of Underpressured Reservoir in Huatugou Oilfield of Qaidam Basin. Journal of Earth Science, 2011, 22(5): 632-632. doi: 10.1007/s12583-011-0214-5
Citation: Hao Xu, Dazhen Tang, Junfeng Zhang, Wei Yin, Xiaozhi Chen. Formation Mechanism of Underpressured Reservoir in Huatugou Oilfield of Qaidam Basin. Journal of Earth Science, 2011, 22(5): 632-632. doi: 10.1007/s12583-011-0214-5
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Formation Mechanism of Underpressured Reservoir in Huatugou Oilfield of Qaidam Basin

doi: 10.1007/s12583-011-0214-5
  • 1.

    School of Energy Resources, Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China

  • 2.

    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

  • 3.

    PetroChina Exploration and Production Company, Beijing 100724, China

  • 4.

    Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Funds:

the National Natural Science Foundation of China 40802027

the National Natural Science Foundation of China 40730422

the National Basic Research Program of China (973) 2009CB219604

the Key Project of the National Science & Technology 2008ZX05034

the Risk Innovation Foundation of PetroChina Co. Ltd. 0706d01040102

More Information
  • Corresponding author: Xu Hao, xuhao600@163.com
  • Received Date: 06 Feb 2010
  • Accepted Date: 13 Jun 2010
  • Publish Date: 01 May 2011
    Abstract
  • Underpressured reservoirs are widespread in the Huatugou (花土沟) oilfield of the western uplift in Qaidam basin, western China. At depths between 462 and 1 248 m, the pressure of Neogene reservoirs in the Huatugou oilfield is only about 40% to 80% of hydrostatic pressure. Based on a study of the geological characteristics of these underpressured reservoirs, this work used fluid inclusion analysis and numerical simulation to investigate the mechanism creating these abnormal pressures and to evaluate the characteristics of the hydrocarbon distribution. The results show that the underpressured reservoirs are all well-sealed by undercompacted and thick mudrocks. The large-scale tectonic uplift in the late Himalayan plays an important role in the generation of underpressure in the Huatugou oilfield. At the beginning of this movement, the field was overpressured due to episodic petroleum accumulation. Later, structural uplift and erosion led to porous rebound and a temperature decrease, which produced the underpressure.

     

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