EVALUATION TECHNIQUES FOR UNDERGROUND BOREHOLE GEOLOGIES WITH STONELEY WAVES

摘要

A method for evaluating underground borehole geologies may include receiving a total response signal from a sensor array placed in a borehole, the response signal representing a pressure wave propagating in the hole. drilling. A secondary signal can be extracted from the total response signal and a depth location for at least one secondary source that corresponds to the secondary signal is determined. An estimated reflectivity response for the secondary signal as a function of the frequency is determined and the estimated reflectivity response is inverted to determine the secondary source and includes at least one of a potential fracture or potential wash. The at least one of a fracture conductivity or wash volume for the secondary source is compared to one or more borehole images corresponding to the depth location of the secondary source to determine if the potential fracture is a real fracture or if the potential wash is a real wash.