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APPLICATION OF VSP IN HIGH-RESOLUTION PROCESSING

He Hongju(Well Logging Company of Sichuan Petroleum Administration)  
Ground seismic resolution can be improved by applying VSP wavelet and spectral property for VSP with the characteristics of stronger reflectance amplitude,higher signal-to-noise ratio,clearer first break than ground seismic factes and for what is recorded by VSP or ground seismic is two way time of seismic wave.Because of ground seismic and VSP with the various frequency,phaes,time deviation and wavelet,it is necessary using VSP to scale ground seismic to ensure the interpretation precision of ground seismic data.Profile resolution can be enhanced by autocorreting VSP reference trace with well-passing ground seismic trace,analysing its wavelet and spectral features,designing a matched filter and doing test in certain range;then doing frequency filtering,phase rotation,time displacement and smooth treatment to achieve the best match VSP with the spectral fecatures of ground seismic;finally filtering well-passing seismic section with the wave filter.Ground seismic resolution reliability enhanced by VSP is proved by theoretical analysis and processed sections and accurate seismic information is provided for careful structural interpretation,reservoir research and cross prediction.
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