二维地震叠偏剖面作图方法的疑难问题

A problem arisen from mapping with 2-D seismic migration

辽河油田研究院, 辽宁盘锦124010

Research Institute of Liaohe Oilfield, Panjin 124010, China

利用单斜构造摸型对T₀ 空校作图方法的正偏移和反偏移进行计算,结果表明“三维空间偏移量可以分解为测线x方向上和垂直于x方向的 2个分量,它们恰好是沿着这 2个方向上的二维偏移量”的结论对v(z) =v0 (1+β_z)时的连续介质而言是不成立的,从而使有关的叠偏剖面作图方法在原理上出现了疑难问题。

The calculation of migration and demigration of T₀ spatial correction mapping is carried on a monoclinal structure model in the paper. When the medium is of v(z)= v 0(1+β_z), the computational results disagree with argument that 3 D migration offset can be split into two components pointing respectively in x direction and vertical direction, and they are just the 2 D migration offset in these two directions, therefore producing an difficult problem for mapping with 2 D migration section.