Abstract:The key to all-dip wave field migration using finite-difference method lies in the continuation direction of wave field.The accurate migration of the reflections which come from all directions can be achieved so fang as the continuation direction of wave.field is reascanably chosen under the constraint of boundary condition of up-going wave.The wave-field continuations along up-going wavefront or down-going wavefront are the two methods we can take to ensure the all-dip migration of wave field.Difference scheme is directly related to the quality of all-dip migration section.The use of conventional difference scheme may bring cross-interfer ence an the migrated section,which,when violent,terminates ar distorts reflection legs,even sometime conceals the reflections absolutely.The cross-interference can be removed by using both difference equation with absorption and ladder difference scheme in migration.The all-dip migration using ladder difference scheme not only effectively removes crass-interference but also preserves amplitude characteristic of step-dip reflections.
收稿日期: 1987-08-17
引用本文:
王振华. 沿上行波波前或下行波波前进行波场的全倾角归位[J]. 石油地球物理勘探, 1988, 23(6): 663-675.
Wang Zhenhua. All-dip wave field migration along up-going wavefront or down-going wavefront. OGP, 1988, 23(6): 663-675.