Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (6): 773-778,785.doi: 10.11743/ogg20090616

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Application of the material balance method to the energy evaluation of fractured-vuggy carbonate reservoirs

Li Jianglong1,2, Zhang Hongfang1   

  1. 1. SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China;
    2. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China
  • Received:2009-09-10 Online:2009-12-25 Published:2012-01-16

Abstract:

The driving mechanisms of the fractured-vuggy units are classified into four types:closed elastic drive,elastic drive with water invasion,elastic drive with closed aquifer,and elastic drive with both closed aquifer and water invasion.A material balance equation is established for each type of driven mechanism.These equations take the characteristics of fractured-vuggy carbonate reservoirs into full consideration,and thus are different from the former equations.This paper puts forward several indexes for evaluating the energy of fractured-vuggry units,including the elastic production rate,the volume of water invasion and multiple of closed aquifer,and proposes a method for evaluation of fractured-vuggy carbonate reservoirs.This method can determine the energy characteristics of fractured-vuggy units and drive mechanisms and can be used to quantitatively calculate the energy and invasion water volume.The calculated results show that the established method can be used to evaluate the energy characteristics of fractured-vuggy units.

Key words: water invasion volume, drive mechanism, fractured-vuggy unit, energy evaluation, carbonate rock, material balance method

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