Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (1): 123-127.doi: 10.3969/j.issn.1673-8926.2016.01.017

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Flow model and well test curves for quadruple-media reservoirs

Jia Yonglu1， Sun Gaofei1， Nie Renshi1， Li Jianming2， Li Haike2   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ，Chengdu 610500 ， China ； 2. Well Testing and Perforating Company ， PetroChina Daqing Oilfield Co. Ltd. ，Daqing 163412 ， Heilongjiang ， China
  • Online:2016-01-20 Published:2016-01-20

Abstract:

For fractured-vuggy quadruple-media carbonate reservoirs with micro-fractures and fractures, the percolation mechanism of large-scale fractures is inconsistent from the small-scale fractures. Using conventional multiple media models to explain quadruple-media reservoirs is inappropriate. A quadruple-media physical and mathematical model based on matrix, micro-fractures, vugs and fractures was established. By means of Laplace transformation and numerical inversion of Stehfest, the real space solution was obtained, and well test curves were drawn up. The result shows that three concaves tend to be present in the pressure derivative curve of the quardrule-media reservoir, of which the amplitude is affected by the interporosity flow coefficient and capacitance coefficient. The width and depth of the concaves are influenced by capacitance coefficient, and the timing and the ampli-tude of concave are affected by interporosity flow coefficient. More parameters present in the quadruple-media reservoirs well testing curves, and curves are more sensitive to the change of parameters. It is suitable to use the quadruple-media well testing models to interpret fractured-vuggy carbonate reservoirs with fractures and micro-fractures

Key words: fine-grained sedimentary rocks , rock types , lithofacies , brittleness index

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