NON-CONSTRAINTED 2-D TRANSFORMATION FILTER FOR GEOPHYSICAL APPLICATIONS, IN PARTICULAR

摘要

The invention relates to a system for the geophysical exploration of formations in depth. This system is characterized in that it comprises: an acoustic source for radiating a field of acoustic wave for shaking said formations in depth, BR/ - a network of seismic receivers reacting to reflected wavefields from said shaken deep formations to provide electrical signals representative of the reflected wavefields, said receivers being arranged on a spatial coordinate grid having main preselected spatial axes, BR/ - a programmed computer coupled to said seismic receivers network for receiving said electrical signals and for synthesizing a transformation filter as a function of the number of waves, BR/ - the said computer being further programmed to frame and move the said synthesized transformation filter, BR/ - means s associated with said computer to define a mapping relationship of the number of waves between a numerically average reaction of the transformation filter squared and displaced on all azimuths and cosine (kx) of the Chebyshev argument; said computer being further programmed to apply said medium transformation filter, framed and moved to the electrical signals received; and BR/ - display means in communication with said computer for displaying the filtered electrical signals. / P