3D seismic investigations and producing qualitative data in Timano-Pechorian province complicated by near surface conditions of the area. Essential heterogeneity of upper part of section produce amplitude anomaly and coherent noise. Attempts to reduce negative effect of near surface heterogeneity if field and on the step of processing keep actual. In this work considered a few methods of coherent noise suppression, such as surface wave noise attenuation, f-k-filtering, "zone" filtration and then tested on the data. Technic of "zone" filtering in cone gives good results to ground roll attenuation, but cuts frequency component, with using this filter possible to prepare data for procedures for velocity analysis and static corrections. F-k-filtering helps to suppress linear coherent noise, but effect of aliasing makes difficulties for ground roll attenuation and can't be used


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