Improving Methods of Determining the Parameter Used to Calculate Permeability Carbonate Reservoir by Using Stoneley Waves

Core testing is the most accurate and most expensive method of measuring permeability. A lot of effort has been carried out for finding alternative methods to estimate permeability. One of the indirect methods of estimating permeability is using Stoneley waves. The main advantage of this method is to record Stoneley waves intrinsic property affected by the permeability and by quantifying the relationship between the physical parameters of waves and permeability, a continuous log of permeability changes around the wellbore can be prepared. This method results are influenced by many parameters; such as, porosity,lithology, accuracy of permeability measurement done by core or MDT tools and calculated Sotoneley slowness in rock matrix. In this study, the effects of the above parameters in the calculation of quantitative values of permeability have been studied. Based on the results, the parameters of porosity and slowness of Stoneley wave in rock matrix have more influence on accuracy of determining permeability. The observation shows that by absence of the accuracy in calculation of Stoneley slowness in rock matrix, the permeability values of some points will be negative. In addition when the porosity parameters is used in permeability , the results are more in tune with permeability values derived from the MDT tools.