To day horizontal Wells have been proven to be an efficient way of producing hydrocarbon reservoirs . Know-how on horizontal well drilling makes this technique very atractive considering the gain in productivity and recovery. In order to optimize production, one of the most important needs is to evaluate the reservoir in the horizontal welt area. Among possible reservoir characterization techniques, the available tools for horizontal wells are the vertical seismic profile and the full-waveform acoustic technique (J.L. Mari and J. Laurent, 1991). Full waveform acoustic data can be used to obtain acoustic sections, with a lateral investigation of several meters trom the borehole and vertical resolution of several lens of centimeters.


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