Complex surface conditions is the origin for the difficult seismic exploration in foothill areas,which causes low S/N and serious
moveout variation between gathers and is the main reason for constraining seismic imaging and further hydrocarbon prediction
in such areas.Nowadays,we yet not own a correct ideology about the seismic acquisition & imaging and lack a suitable seismic
data processing procedure and corresponding software,which limit the breakthrough of the oil exploration in the foothill
areas.From the seismic and geological reality,we analyzed the peculiarity of the seismic acquisition and imaging in foothill
area,and proposed a viewpoint that seismic acquisition should be based on the in-phase stack of the reflections from half
Fresnel band.On the basis of the wavefront from any subsurface scattering point (or reflection point) to the surface were
collected completely,we should pay much more attention on the high fold and low-frequency signal (such as smaller than 6
Hz).For seismic imaging in foothill area,we should obey the following rules:① seismic imaging should start from a smoothed
datum which is close to the real topography and near the surface;② the unified horizon velocity estimation and model building
for surface and middle-deep layers is regarded as the core of the procedure;③ beam integral PSDM is chosen as the main
migration tool.In general,the urgent matters for the foothill seismic exploration include field acquisition guided by correction
ideology and the development of specialized imaging software.
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