An optimized 3-D geometry for transitional zone seismic survey

The geometry applied in transitional zone seismic survey includes onshore geometry and offshore geometry, and the complicated transition between the two geometries is also involved. Generally, 3-D land seismic survey geometry uses more receiver channels with relatively fewer shot points. 3-D offshore seismic survey geometry utilizes more shot points with relatively fewer receiver channels. Geometries can be merged seamlessly in theoretical design, but the merging is very difficult to be realized because the spread for some specific land shots are required to be of the same channels as it extends from land to offshore water. Therefore, based on the above seamlessly geometry theoretical design, by adopting shot-receiver interchangeable principle, an optimized geometry suitable for the working characteristics in transitional zone was proposed. Actual application shows that the optimized 3-D seismic survey geometry in the transitional zone not only solves the problem of deficiency in offshore arranges and sufficiency in land arranges in actual work, realizes the seamless merging of offshore and land system, but also maintains the attributes distribution consistency of the onshore and offshore data.