In the process of vibroseis dynamic sweep acquisition,the seismic waves generated by adjacent multiple groups of sources interfere with each other,which affects the quality of seismic data.A reasonable design of acquisition time-distance rule can minimize the interference between efficient sources while ensuring the quality of raw data and the efficiency of vibroseis acquisi-tion.In the past,the design of dynamic sweep time-distance rule did not consider the suppression effect of efficient acquisition noise and lacked a quantitative unified standard.This paper introduces the suppression effect of efficient acquisition noise into the design of dynamic sweep time-distance rule for the first time.Based on the uncorrelated data acquired by different surface sources through field tests,the cross-correlation method is used to obtain the efficient acquisition noise data,and a quantitative unified standard for design of time-distance rule is established with the energy of environmental noise,spatiotemporal position of interference,and ener-gy ratio of the interference area as the thresholds.Thus,a method for quantitative optimization design of vibrosesis dynamic sweep time-distance rule is formed.This method can optimize the field test scheme and reduce the testing workload.lt is compatible with the signal-noise separation technology in seismic data processing to optimize the slip time parameter.This quantitative and qualita-tive combined method can avoid the artificial subjective ambiguity brought by the conventional qualitative analysis method based on frequency scanning.Moreover,this method is not constrained by the surface characteristics of the exploration area and can maxi-mize the efficiency of acquisition while ensuring the quality of seismic data.The proposed method for quantitative optimization de-sign of vibrosesis dynamic sweep time-distance rule is an important supplement to the supporting technology of efficient vibroseis acquisition,and facilitates the application of"wide azimuth,broadband,and high-density"seismic acquisition technology.
维普
万方数据
