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1. (WO2018183346) AMPLITUDE COMPENSATION OF REVERSE TIME MIGRATION (RTM) GATHERS FOR AVO/AVA ANALYSIS

Pub. No.:    WO/2018/183346    International Application No.:    PCT/US2018/024594
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: G01V 1/28
Applicants: ION GEOPHYSICAL CORPORATION
Inventors: CALDERÓN, Carlos
BERRANGER, Ivan
HUANG, Wei
BROOKES, David
CHEN, Guoquan
MARTIN, Gary
Title: AMPLITUDE COMPENSATION OF REVERSE TIME MIGRATION (RTM) GATHERS FOR AVO/AVA ANALYSIS
Abstract:
A method of geophysical exploration in a seismic survey includes acquiring a set of seismic traces based on seismic data obtained by a seismic receiver, responsive to seismic energy reflected from a subsurface geology. Additional steps include performing reverse time migration on the seismic traces using a velocity model that represents velocity of the seismic energy propagating through the seismic medium. The migrated gathers have an amplitude based at least in part on the migration, which can be corrected by computing synthetic seismograms to provide compensated gathers. Amplitude versus offset and/or amplitude versus angle analysis can be performed on the compensated gathers, in order to generate a seismic image of subsurface structures in the survey area.