Subsurface imaging systems and methods with multi-source survey component segregation and redetermination
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United States of America Patent
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Mar 17, 2015
Grant Date -
Apr 11, 2013
app pub date -
Oct 10, 2011
filing date -
Oct 10, 2011
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Abstract
A disclosed subsurface imaging method begins by obtaining initial signals from a geophysical survey that has been acquired with multiple geophysical energy sources actuated in a plurality of firing sequences, each sequence having a known time delay between the firing times of each source. The initial signals are grouped into gathers of signals acquired from multiple firing sequences. For each gather, initial estimates of the first and second source wave fields are determined. Quieted signals for the first source are then generated to represent the initial signals minus a current estimate of the second source wave field. A coherent energy separation operation is applied to the quieted signals to obtain a refined estimate for the first source wave field.
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