Double Inspection Suppresses The Study Of Virtual Reflection And Sounding

Ghost and reverberation are the most important factors that hinder the broadband acquisition of marine seismic data,and they are also the biggest difficulties of marine seismic data processing.Dual-sensor acquisition technology can have an excellent suppression effect for downward ghost and reverberation.At the same time,there are also some new broadband acquisition methods,such as up and down cables,variable depth cables,up and down sources,etc.Dual-sensor technology can also apply these new acquisition methods.Therefore,it is necessary to study the filed characteristics of the hydrophone and geophone records,and the filed characteristics of dual-sensor synthetic signals under different acquisition depths,and matching effects of received signals of different detectors.On the basis of previous study,beginning with the particle characteristics of polarity,the polar correspondence deriving from three kinds of ghost and two kinds of reverberation in hydrophone and geophone records is analyzed.Furthermore,the theoretical response characteristic functions and notch characteristics of ghost and reverberation are derived.Based on the acoustic wave equation forward modeling technique,digital simulation of typical geologic models with different water depth,source depth,dual-sensor detectors depth,offset and bottom reflection coefficient of the hydrophone and geophone records are performed.And then,we analyze the wave field characteristic and the synthesis wave field characteristic of the signals.Based on the simple model,complex model and practical data,two kinds of matching filtering techniques under L2 and L1 nonn are carried out to improve the amplitude,phase and frequency difference of hydrophone and geophone datum.These two techniques achieve the suppression of multiple waves.In order to achieve a good effect suppressing,the parameter test and error analysis are carried out on the basis of simple theoretical model.Through the research of wave field characteristics,a clear physical meaning of the source depth and dual-sensor detector depth for design theory of the seismic layout are obtained.And the data processing of different offset are also obtained.By means of the matched filtering technique under the L2 and L1 norm criteria,the selection basis for filter factor length of L2 norm are got,and the selection criteria of filtering factor length and the error tolerance of the L1 norm are obtained.According to the error analysis and the synthetic results,it is concluded that the difference between the hydrophone data and geophone data is closer to the exponential distribution,and thus the dual-sensor synthesis under the L1 norm criterion is better.