Azimuthal analysis of hybrid gathers

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Title: Azimuthal analysis of hybrid gathers
Author: Perez, Anisa Marie
Abstract: The cross -spread formed by intersecting source and receiver lines , or “hybrid gather” consisting of all common mid -points (CMPs ) in a reflection patch defined by the acquisition geometry , has been revived in recent years as a possible solution to the increasing need for ever -improving imaging of 3 -D seismic reflection data . These hybrid gathers , however , are currently not widely used in processing . Development of processing procedures for hybrid gathers is needed to further the efficiency of their application . The use of hybrid gathers in processing is justified by their performance as an areal array in attenuating both random and coherent noise from all azimuthal directions . Hybrid gathers also allow for azimuthal filtering to correct for wave propagation effects . Through an azimuthal analysis in an azimuthally anisotropic medium , the effects of structural dip on reflection time can be isolated and separated from pre -stack propagation effects of the media , particularly distortions due to azimuthal anisotropy . A binning strategy is determined for hybrid gathers which best allows for azimuthal anisotropy to be observed and distinguished from structural dip . This allows for improved velocity estimation for imaging and separate analysis of azimuthal variations in propagation properties of subsurface media at an early stage in the processing sequence . The degree and orientation of the anisotropy can then be estimated using a semblance method .
URI: http : / /hdl .handle .net /2152 /ETD -UT -2009 -05 -118
Date: 2009-09-03


Azimuthal analysis of hybrid gathers. Master's thesis, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /ETD -UT -2009 -05 -118 .

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