Abstract

HUI, Sun et al. Research into the effects of seawater velocity variation on migration imaging in deep-water geology. Earth Sci. Res. J. [online]. 2016, vol.20, n.3, pp.H1-H7. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v20n3.56382.

This paper aims at the problem that the migration quality is poor in deep water. It analyzed the influence that velocity model accuracy had on migration and studied the impact that variable seawater velocity makes on movement effect. At first, variable seawater velocity affected by temperature, pressure, and salinity is defined to replace the actual seawater velocity. Then variable seawater velocity's influence on interface migration location, layer sickness and movement energy focusing degree are analyzed in theory. Moreover, finally, a deep water layered medium model containing variable seawater velocity, a syncline wedge shape model, and a complex seafloor velocity model are constructed. By changing the seawater velocity of each model and comparing migration results of constant seawater velocity model and variable seawater-velocity model, it was found the conclusion. Under the condition of deep water, variable seawater velocity's impact on the quality of seismic migration is significant, which not only can change the location of geologic body migration result but also can influence the resolution of the geologic interface in the movement section and maybe can cause migration illusion.

Keywords : Seawater velocity; Deep-water geology; Migration Imaging; Migration velocity.

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