Abstract:

Owing to their severe heterogeneity,fractured-vuggy carbonate reservoirs distribute and extend in an unpredictable way,causing difficulties in the determination of single-well producing area and undermining the accuracy of single-well producing geological reserves calculation with the volumetric method.Based on the reservoir material balance principles and division of fractured-vuggy reservoir units,a new reserve calculation method is developed.It first determines single-well controlled area according to the single-well recoverable reserves,and then calculates single-well producing geologic reserves with the volumetric method.The new method is applied to the calculation of the producing reserves within the typical fractured-vuggy carbonate reservoir units in Tahe oilfield.The results are consistent with that obtained by using the dynamic method,indicating that the new method is practical in calculating the producing reserves in severely inhomogeneous fractured-vuggy carbonate reservoirs.

Key words: fractured-vuggy reservoir, material balance principle, producing reserve, reserve calculation procedure