3D Interval velocity analysis along s single seismic line from a 3D survey

Abstract

Often in a 3D seismic survey the geological area of interest can be seen most clearly on a particular seismic live and an accurate depth conversion is required for the "2D" line. To achieve this, account must be taken of the image ray correction (Hubral , 1977) in the depth conversion of the time migrated data. A good depth conversion depends largely upon the formation interval velocities used. With modern acquisition methods, the common mid point (CMP) binning may be complex (Figure 1). This means that when estimating the subsurface interval velocity (Hadley et al, 1988), the 3D geometry and complex travel path through the overburden structure must be considered for the CMP data (Figure 2).