DIP TOMOGRAPHY FOR ESTIMATING DEPTH VELOCITY MODELS BY INVERTING PRE-STACK DIP INFORMATION PRESENT IN MIGRATED/UN-MIGRATED PRE-/POST-STACK SEISMIC DATA
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United States of America Patent
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Issued Date -
Jul 17, 2014
app pub date -
Jan 10, 2014
filing date -
Jan 11, 2013
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Abstract
Methods and systems for dip constrained non-linear tomography in seismic data. An additional term, comprising the dip associated with the kinematic migration of locally coherent events, is introduced into the cost function. The velocity is then updated to match the expected dip of the re-migrated offset-dependent events. Volumetric dip information can be automatically selected at a greater density in shallow locations, therefor complementing the lower density of the RMO events associated with shallow locations.
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