Harmonics on-site suppression on vibroseis slip-sweep data

As a main tool of high-density wide azimuth 3D seismic acquisition,vibroseis slip-sweep can effectively improve the productivity and reduce operation cost in the field.However,the inherent harmonics of multi-vibrations inevitably interfere with adjacent shot records due to application of slip-sweep.Therefore,the effectiveness of harmonics suppression has become the premise to ensure the data quality of slip-sweep recording.The paper approaches the generation mechanism of harmonics and the energy classification of harmonics by analyzing the basic principle of vibroseis excitation,propose target-oriented design with some parameters for slip-sweep,and focuses on the suppression of strong second and third harmonics.Both field tests and field data recordings show that this harmonics suppression method introduced obtains good results.