摘要 直接利用二维叠偏剖面编制构造图,一直是解释员最感兴趣的问题。理论证明,反射点在三维空间的偏移量可以分解为沿测线 x 方向上和垂直于 x 方向上的两个分量,它们恰好是沿这两个方向上的二维偏移量。应用叠偏剖面直接成图,表示已实现测线 x 方向的偏移,成图后,再做一次垂直于测线的校正,这样就完成了三维偏移的构造图。此做法十分类似于地震资料处理中的两步法偏移。直接利用叠偏剖面作图还涉及到交点闭合问题,通常不能直接闭合,需要根据叠偏剖面的 t0时间和倾角计算出相交测线上的 T0时间才能求得闭合。
Abstract:Seismic interpreters are very interested in direct structural mapping from 2D migrated sections。Theory shows that the displacement of a reflection point in 3D space after migration can be decomposed into two components, one in x direction along the line, the other in y direction across the line which are equivalent to ,the displacements of the same point on the two directions in the 2D migration seetions, Mapping from 2D migrated sections corresponds to the. migration of x direction.After cross一line correction, structural map with 3D migration is obtained. This procedure is very similar to the two一step migration in seismic data processing. Mapping from migrated sections are involved with ties of intersections which could not be tied directly, therefore, the two way reflection time of the Iine intersections should be calculated based on the vertical time and dips in the migrated sections and then the intersection ties can be made.
引用本文:
刘素庚. 用叠偏剖面直接编制构造图[J]. 石油地球物理勘探, 1984, 19(5): 453-459.
Liu Sugeng. Structural mapping from migrated sections. OGP, 1984, 19(5): 453-459.