用逆向递推原理作动校叠加

NORMAL MOVEOUT STACK BY INVERSE RECURSIVE FILTERING

In the geophysical prospecting for petroleum at the present day, a great change has been going on in terms of the geophone offset and number of recording channel in order to ensure very plentiful seismic information expected. So it has aroused a profound interest among a large number of geophysicists doing the solid job. As the receiving conditions given are large offset, multichannel (especially in large numbers) , how to take the advantage of"MULTICHANNEL" to help resolve a step further the problems, such as the resolution as well as S/N of shallow and medium layers and minimize the stretch distortion of reflection event, which are caused by NMO. Aiming at these problems, a new technique is advanced.Th-at's to make an "integral move" segment-by-segment for CDP gather in time-space domain by using inverse recursive velocity, so that NMO distortion can be reduced to minimum. The technique presented in the paper is developed on the assumption of simple horizontal layer and homogeneous media. It can be seen from trial computation on the theoretical model record with no muting performed that the kinetic characteristics could be well preserved as a result of using the NMO stack, a technique put forward in this paper.