Abstract：In view of near-surface scattered interference and starting from building noise time-distance equation,then paper discussed quantitative analyzing method for suppressing scattered interference of 3-D seismic geometry:①using seismic section,drilling data,geologic background data and geographic information to determine the depth of targets,average velocity and major noise types and propagating velocity,designing multi-set of geometry on that basis;②computing position relationship of each channel on CMP gather according to geodetic coordinates of shot point,receiver point and scattered source,and further computing the residual moveout of noise;③computing suppression character of noise on CMP gather in work zone or sub-work zone and drawing the map,making the distribution of noise-suppressed characters and further drawing noise-suppressed character chart and frequency-number distribution map;④using noise-suppressed character chart and frequency-number map for integrative analysis for different geometry and determining the noise-suppressed effect of different geometry,and 3-D geometry with stronger noise-suppressed capacity was selected on that basis.Numeric computation and real seismic data processing showed that noise-suppressed evaluation method mentioned in the paper is able to quantitatively evaluate the noise-suppressed capacity of 3-D seismic acquisition geometry and appreciate noise-suppressed character,which is of benefit to optimize the parameters of 3-D geometry.
