LOOK-AHEAD SEISMIC WHILE DRILLING

摘要

A method of evaluating a formation of interest, comprises collecting a data set comprising signals received at a plurality of receivers signals from a source on a bottom- hole assembly at a position in a borehole, processing the data set so as to create a virtual trace received at a virtual receiver located at the source position, and using the virtual trace to generate an image or measurement containing information about the formation of interest. The source may or may not be a drill bit and the data can be collected at several different source positions.