Patent ID: 7515505
Filing Date: 2009-04-07
Classification: G01V

Abstract:
1. A method of separating the seismic response for each of a plurality N of seismic vibrators operated simultaneously with continuous sweeps, said method comprising the steps of: (a) obtaining a seismic data record of the combined response signals from all vibrators as detected and recorded by at least one detector, each vibrator having been loaded with a unique continuous sweep signal consisting of M≧N segments, the i (b) obtaining a vibrator motion record for each vibrator containing a signature for each vibrator indicative of the motion of that vibrator; (c) parsing the vibrator motion record for each vibrator into M shorter records, each shorter record coinciding in time with a sweep segment, and then padding the end of each shorter record sufficiently to extend its duration by substantially one listening time; (d) forming an M×N matrix s whose element s (e) parsing the seismic data record from step (a) into M shorter records, each shorter record coinciding in time with a padded shorter record of vibrator motion from step (c); (f) forming a vector {right arrow over (d)} of length M whose element d (g) solving for E where S ij (f) is the Fourier transform to the frequency (f) domain of s ij (t) and D i (f) is the Fourier transform of d i (t), where i=1, 2, . . . M and j=1, 2, . . . N; and (h) inverse Fourier transforming the E