Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (4): 405-411.doi: 10.11743/ogg20090403

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Method for obtaining key parameters for calculating residual oil amount in carrier beds after oil migration and accumulation in the Liaodong Bay Depression

Tian Lixin1, Wu Li2,3, Jiang Zhenxue2,3, Zhou Jingjing2,3, Yao Leilei2,3   

  1. 1. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education, Beijing 102249, China;
    2. Research Center for Basin and Reservoir, China University of Petroleum, Beijing 102249, China;
    3. Exploration and Developmen Research Institute, CNOOC Tianjin Company, Tianjin 300452, China
  • Received:2009-05-21 Online:2009-08-25 Published:2012-01-16

Abstract:

The 1st and 2nd member of the Paleogene Shahejie Formation (E3s1 and E3s2) in the Liaodong Bay depression were taken as examples.We performed geologic and statistical analyses on the residual hydrocarbons and physical properties of the reservoirs.Based on the characteristics of residual hydrocarbons inside and outside the hydrocarbon kitchen and in combination with the relationship between buoyance of oil column in carrier beds and capillary pressure of pores,we determined the height of residual oil column and calculated the amount of residual oil in carrier beds.The results show that the amount of residual oil range from 184 to 259 million tons in the carrier beds of E3s1 and E3s2 in the Liaodong Bay depression,amounting to 7.4%-10.4% of the total hydrocarbon expulsion.Residual hydrocarbon in reservoirs is the main loss of hydrocarbon in the process of secon-dary migration.The key parameters for calculating residual oil have great impact on the accuracy of prediction.

Key words: lower limit of porosity, oil migration-accumulation range, height of residual oil column, amount of residual oil, Liaodong Bay

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