Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (3): 379-383,378.doi: 10.11743/ogg20090319

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Methods for determining the petrophysical property cutoffs of extra-low porosity and permeability sandstone reservoirs——an example from the Xishanyao Formation reservoirs in Yongjin oilfield

Jiao Cuihua1, Xia Dongdong2, Wang Jun3, Liu Lei3, Sheng Wenbo3, Cheng Peitao3   

  1. 1. Faculty of Natural Resource & Information Technology, China University of Petroleum, Beijing 102249, China;
    2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 10083, China;
    3. Research Institute of Geosciences, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257051, China
  • Received:2009-02-05 Online:2009-06-25 Published:2012-01-16

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Abstract:

With the porosity range of 4% to 6% and the permeability range of 0.01?10-3 μm2-0.30?10-3 μm2,the Xishanyao Formation reservoirs in the Yongjin oilfield of the Junggar Basin are typical extra-low porosity and extra-low permeability reservoirs.According to the static and dynamic data and petrophysical experiments,we have determined the effective porosity and permeability cutoffs of these reservoirs through methods of empirical statistics,oil-bearing occurrence test,physical property test,nuclear magnetic resonance,minimal pore throat radius and displacement pressure.The results show that the lower limit of porosity is 6% and the lower limit of permeability is 0.08?10-3 μm2,providing basis for determining effective thickness and estimate reserves.

Key words: effective thickness, petrophysical property cutoff, extra-low porosity and extra-low permeability re-servoir, Yongjin oilfield, Junggar Basin

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