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Studies on the reservoir characteristics and the fluid flow in Jianquanzi member of the Jiuxi Basin,northwest China

Zhang Shi-ming,Wang Jian-gong,Zhang Xiao-jun,Zhang Ting-jing,Cao Zhi-qiang,Yang Lin-ke
 
  

  1. 1.PetroChina Research Institute of Petroleum Exploration and Development-Northwest (NWGI),Lanzhou 730020,China;
    2.Key Laboratory of Reservoir Description,CNPC,Lanzhou 730020,China;
    3.Liaojunmiao Oilfiled Area,PetroChina Yumen Oilfiled Company,Jiuquan 735200,China;
    4.Research Institute of Exploration and Development,PetroChina Yumen Oilfield Company,Jiuquan 735200,China
  • Received:2018-04-11 Revised:2018-06-25 Online:2018-08-10 Published:2018-08-10

Abstract: Based on the thin sections observation,capillary pressure testing,relative permeability measuring and other experimental methods,distributed rules and flow characteristics of fluid in reservoirs of Jianqauanzi member,Jiuxi Basin,were studied.The results show that according to features of pore structure the pores can be divided into three kinds.I class has relatively good reservoir property,the capillary curves have significant platforms,and positive skewness.The samples with high oil saturation have the characteristics of thicker maximal radius and median radius,more positive skewness,lower entry pressure.Oil-water relative permeability of high permeability samples changes fast,the oil displacement efficiency of high permeability samples is high.Compared with oil-water relative permeability curves,the oil-nitrogen relative permeability curves have lower residual oil saturation and wider common permeable region.The wet ability,pore structure and contents of clay minerals are three key factors affecting fluid flow in reservoirs.The samples with high proportion of crude pore,low contents of clay minerals have good percolation condition,which conforms to Dercy’s law.The reservoirs have the typical features of water-wet reservoirs.Nitrogen displacement efficiency was more efficient than water displacement efficiency,especially for the low permeability samples.

Key words: Jiuxi Basin, Juanqauanzi member, Pore structure, Fluids distribution, Fluid flow characteristics

CLC Number: 

  • TE122.2+3

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