Subsurface imaging systems and methods with multi-source survey component segregation and redetermination

摘要

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.

主权项

1. A subsurface imaging method that comprises:
obtaining initial signals from a geophysical survey acquired with multiple geophysical energy sources actuated in a plurality of firing sequences, each sequence having a known, different time delay between a seismic signal recording start time and a firing time of each source; forming gathers of the initial signals, each gather comprising signals acquired from multiple firing sequences; and for each gather:
determining initial estimates of a first source wave field and a second source wave field;generating first source quieted signals representing the initial signals minus a current estimate of the second source wave field; andapplying a coherent energy separation operation to obtain a refined estimate of the first source wave field from the first source quieted signals.