Abstract
An inverse model, which quantitatively estimates formation permeability from attenuation of the Stoneley wave in a borehole embedded in a porous medium, is presented. By means of the model, the effects of porosity, size of borehole, and intrinsic attenuation on estimation of permeability are investigated, respectively. When the formation porosities are more than 10 percent and borehole radii range from 0. lm to 0.12m, the effects of porosity and borehole radius are not important. The model shows a good suitability with permeability in range of 100mD—2D. However, the intrinsic attenuations of the formation and borehole fluid usually dominate Stoneley-wave attenuation at low-permeability (less than 100mD) case. So an empirical approach of quantitatively evaluating formation intrinsic attenuation from Gamma-ray log is also presented.
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