Wave propagation in fluid filled boreholes is widely used for investigating the properties of hydrocarbon reservoirs. For a better understanding and investigation of these waves it is important to analyse their dispersion; i.e. their frequency dependent velocity. Conventional techniques like F-K analyses of finite-difference models or classical root-finding techniques are, for these purposes, too time consuming and difficult to implement.
In this work a new technique, the spectral method, is used to model the dispersion of borehole modes. The method will be especially extended for permeable, attenuating and anisotropic layers. Being able to provide a forward modelling tool will be useful in order to understand and interpret wave propagation in hydrocarbon reservoirs. The spectral method can supplement, or even replace, conventional techniques, as the computation time is much shorter and more complicated scenarios are easier to compute. Additionally this tool could be used in the future to invert frequency dependent velocities from experiments where the data could either be acquired in the laboratory or in real boreholes.
Prof. Boris Gurevich (B.Gurevich@curtin.edu.au)