Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 117-124.doi: 10.3969/j.issn.1673-8926.2016.06.016

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Permeability calculation of tight sandstone reservoir by conductivity parameters

Yin Shuai 1，2，3， Ding Wenlong 1，2，3， Shan Yuming4， Zhou Wen4，Fang Kedong5， Zhao Xin5， Zhang Huinan5   

  1. 1. School of Energy Resources， China University of Geosciences， Beijing 100083， China； 2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism， Ministry of Education， China University of Geosciences，Beijing 100083， China； 3. Key Laboratory for Shale Gas Exploitation and Assessment， Ministry of Land and Resources，China University of Geosciences， Beijing 100083， China； 4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 5. Shanxi Branch of Coalbed MethaneExploration and Development， CNPC， Jincheng 048000， Shanxi， China
  • Received:2016-04-13 Revised:2016-06-21 Online:2016-11-10 Published:2016-11-10

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Abstract: The tight sandstone reservoirs have strong heterogeneity, and it is difficult to realize effective prediction of permeability by conventional methods. In order to solve this problem, this paper established a permeability model for tight sandstone reservoirs considering rock conductivity （Cs）, grain conductivity （Cg）, formation water conductivity （Cw）and cementation index （m）, then discussed their effects on permeability, and established the relevant interpretation chart in the reasonable value selection range. The results show that: （1） With the increase of Cs, the permeability of tight sand-stone increases. When the Cs of rock is lower, its effect on permeability is less; otherwise, the effect is greater. （2） With the increase of Cg, the permeability of tight sandstone decreases, but the effect of Cg on permeability of tight sandstone is not great. Comparing with Cg, the effect of Cs on permeability of tight sandstone is greater. （3）With the increase of m,the permeability of tight sandstone increases. When the m is lower, its effect on permeability is less; otherwise, the effect is greater. This method was applied to predict the permeability of the Triassic tight sandstone reservoirs in western Sichuan Basin, and a good application effect has been achieved. This research could provide important reference for tight sandstone reservoir evaluation and logging interpretation.

Key words: AVO, lateral velocity variations, small-scale body, reflection coefficient, overdetermined equation

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