Acoustic Logging Methods in Fractured and Porous Formations

Sudad H. Al; Khalaf F H

Abstract

Abstract Formation fractures have significant importance in the rocks’ permeability of oil and gas reservoirs. In real conditions, the opening of vertical fractures exceeds the opening of horizontal fractures and the permeability of reservoirs in conditions of horizontal wells is higher than in vertical conditions. For the sonic log longitudinal waves, unlike the transverse waves, the attenuation rate strongly depends on the wave path direction. It is shown that the mechanism of attenuation of sound waves in porous rocks is represented by the scattering of "soft" micro-heterogeneous inclusions. For reservoir rocks with a porosity coefficient (φ) of 10–20%, the attenuation decrement is several times higher than the decrement of the other mechanisms. Keywords: Porosity, fractures, pores, acoustic logging, attenuation decrement, permeability, longitudinal waves, transverse wavesCite this Article Al Sudad H., Khalaf FH. Acoustic Logging Methods in Fractured and Porous Formations. Journal of Offshore Structure and Technology. 2017; 4(2): 28–35p.