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A novel saturation model of vuggy carbonate reservoirs and its application

Jiang Li-ming1,2,Yu Chun-hao1,2,Qi Bao-quan3,Zhu Han-bin1,2,Wang Yong-jun3   

  1. 1.Technology Center,China Petroleum Logging Co.Ltd.,Xi’an 710077,China;
    2.Well Logging Key Laboratory,CNPC,Xi’an 710077,China;
    3.Well Logging Company,CCDC,Chongqing 400021,China
  • Received:2016-06-08 Revised:2016-09-10 Online:2017-08-10 Published:2017-08-10

Abstract:

The traditional Archie model has certain inapplicability in carbonate reservoirs,due to the complex pore structure and strong heterogeneity.For example,the variable values of cement index (m) and saturation index (n) often lead to a great deal of difficulties in saturation estimation.Based on the rock physics volume model,the saturation index (n) is assumed to be constant and redefine cementation exponent (m) as a pore structure index.It is used to replace the effect of the original Archie cementation exponent and saturation index on water saturation calculation.Rock physical experiment is hard to be applied to the rocks from the complex reservoir.For the carbonate sample with fracture and dissolution vuggy,we can’t obtain the cores easily.Therefore,the effects of the law of aspect ratio,porosity,clay content on the formation factor F and pore structure index of carbonate reservoir rocks are studied by numerical simulation.A new saturation model with variable index of pore structure is developed after the compositions of pore structure are employed in our research.The field logging data from one well in Sichuan Oilfield is processed using the new saturation model,and the applications of the new saturation model suggest that saturation precision has been improved.

Key words: Vuggy carbonate reservoirs, Digital core, Pore structure index, Saturation model

CLC Number: 

  • TE132.1+4

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