| 摘要 |
The or each vibrator in a first vibrator group is actuated at time T0, a second vibrator group is actuated at time T1 that satisfies T0 < T1 < T0 + S1 + L where S1 is the sweep time of the first vibrator group and L is the listening time. At least one of the first vibrator group and the second vibrator group comprises at least two vibrators. The first group and the second group of vibrators may be the same group, or they may be different groups. This method enables the time required to complete a seismic survey to be reduced compared to the prior art "simultaneous shooting" and "slip-sweep shooting" techniques. Where the first group and the second group of vibrators are different, the method may further comprise actuating the first vibrator group at time T2, where T1 < T2 < T1 + S2 + L and S2 is the sweep time of the first vibrator group, and then actuating the second vibrator group at time T3 where T2 < T3 < T2 + S1 + L and where T3 - T2 * T1 - T0. The varying time delay between a shot of the first vibrator group and the corresponding shot of the second vibrator group means that harmonic noise will occur at different times in the shot records so that the noise may be eliminated by appropriately combining the shot records.
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