More advanced processing techniques, such as Prestack Depth Migration (PSDM), can significantly improve seismic imaging, especially in areas of complex geology.
Processes such as PSDM take more time, expertise and resources to apply, but accurate 3D seismic images can mean the difference between success or an expensive dry hole.

 
In this example from the Gulf of Mexico, see how PSDM has improved the imaging of
a) a massive salt body, and
b) sedimentary layers beneath the salt