Oil & Gas Geology ›› 2015, Vol. 36 ›› Issue (3): 497-503.doi: 10.11743/ogg20150319

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Research on flow unit division rationality of Yan 91 oil reservoir in Yang 19 block of Suijing oilfield,Ordos Basin

Chen Zhe1, Lu Jun2, Zhao Yaohui2, Zhang Wei2, Zhang Chunsheng1, Tian Qinghua3   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China;
    2. Oil Production Plant No.4, Changqing Oilfield Company, PetroChina, Yinchuan, Ningxia 750005, China;
    3. Gas Production Plant No.2, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710000, China
  • Received:2014-05-09 Online:2015-06-08 Published:2015-07-24
  • Contact: 张春生(1963—),男,教授,沉积学及油气储层评价。E-mail:zcs129@126.com。 E-mail:zcs129@126.com

Abstract:

Currently, most of the flow unit divisions are only based on such static parameters as lithology and physical property, which make the division results deviate from the actual production practices.Besides, the verification method of the flow unit is single.In order to put forward a more reasonable division method of flow units, Yan 91 oil reservoir in Yang 19 block of Suijing Oilfield was taken as an example.Five groups of static parameters and three groups of dynamic parameters were selected to divide the flow unit of Yan 91 reservoir more accurately.By applying the Q type hierarchical clustering analysis method to each parameter, the reservoir can be divided into four types of flow unit including type A, type B, type C and type D.And the hit ratio of the result from discriminant analysis is 99.3%.The rationality of the results was demonstrated in respects of seepage characteristics, heterogeneity and spatial correlation, improving the verification method of the flow unit.The division results show that the physical characteristics correlate well with dynamic productions of each flow unit, indicating the rationality of the division of flow unit.The research shows that the flow units of Yan 91 reservoir are dominated by type B.The type A and type B units may be the emphasis of residual oil development.

Key words: flow unit, residual oil, Yan'an Formation, Suijing oilfield, Ordos Basin

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