CPC G01V 1/303 (2013.01) [G01V 2210/614 (2013.01); G01V 2210/6161 (2013.01); G01V 2210/6222 (2013.01)] | 11 Claims |
1. A method for calculating a velocity model for a subsurface of the earth, the method comprising:
receiving measured seismic data d;
calculating predicted seismic data p;
selecting a matching filter w such that a convolution operation between the matching filter w and one of the measured seismic data d or the predicted seismic data p is equal to the other one of the measured seismic data d or the predicted seismic data p;
selecting a misfit function J that calculates (1) a distance between the matching filter w and a Dirac Delta function or (2) a travel time shift associated with the measured seismic data;
calculating a new velocity model using the misfit function J, the measured seismic data d, and the predicted seismic data p; and
generating an image of the subsurface of the earth, based on the new velocity model, for identifying resources in the subsurface,
wherein the measured seismic data d includes wavefields generated by a seismic source and the wavefields propagate through the subsurface where they are attenuated and reflected, and the attenuated and reflected wavefields are recorded by plural seismic receivers.
|