LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 19-24.doi: 10.3969/j.issn.1673-8926.2015.05.004

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Formation mechanism and vertical distribution of velocity sensitivityeffect in reservoir: An example from Triassic sandstone reservoir in Jilake area, Tabei uplift

Han Denglin12, Zhang Shuangyuan2, Yuan Wenfang3, Feng Zhichao4,Ouyang Chuanxiang5, Peng Shuqi6   

  1.  1. Key Laboratory of Exploration Technologies for Oil and Gas Resources , Ministry of Education , Yangtze University ,Wuhan 430100 , China ; 2. School of Geosciences , Yangtze University , Wuhan 430100, China ; 3. Research Institute of Exploration and Development , PetroChina Tarim Oilfield Company , Korla 841000 , Xinjiang , China ; 4. No. 1 Oil Production Plant , PetroChina Changqing Oilfield Company , Yan ’ an 716000 , Shannxi , China ; 5. College of Petroleum Engineering ,Yangtze University , Wuhan 430100 , China ; 6. Xinjiang University , Urumqi 830046 , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

 As a main production layer of Jilake area in Tabei uplift, the TII24 layer is subject to a considerable variety of velocity sensitivity. The higher values of the velocity sensitivity effect are concentrated in the upper part of the TⅡ24 layer(single sand layers of TⅡ24-1 and TⅡ24-2), showing a marked vertical disparity. The formation mechanism of velocity sensitivity effect within the layer was thoroughly analyzed from macroscopic and microscopic perspective by means of observing thin section, analyzing the X-ray fluorescence spectra and measuring the capillary pressure curve. The result shows that high content of clay minerals and the remaining particles of dissolved volcanic grains constitute the main source of the transmittable particles within the layer. The pore throat structure parameters indicate pore throat connectivity is relatively poor. The two aspects mentioned above are the main controlling factors for the strong velocity sensitivity. Relatively high content of clay minerals and comparatively poor pore throat connectivity in the upper part of the TII24 layer are the key controlling factors for the vertical disparity of the velocity sensitivity damage.

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