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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 t_0时间和倾角计算出相交测线上的 T_0时间才能求得闭合。
The direct use of two-dimensional cross-section profile structure diagram, has been the interpreter most interested in the problem. It is theoretically proved that the offset of the reflection point in three-dimensional space can be decomposed into two components in the x-direction and the x-direction along the measuring line, which are exactly the two-dimensional offset along the two directions. Applying the stratified profile directly into the map indicates that the displacement in the x-direction of the survey line has been achieved. After the map is made, the correction perpendicular to the survey line is done again, thus completing the construction map of the three-dimensional offset. This approach is very similar to the two-step migration in seismic data processing. Directly using the stack-section profile mapping also involves the intersection point closure problem, which usually can not be directly closed. The t_0 time on the intersecting measurement line needs to be calculated according to the t_0 time and inclination of the stack profile in order to obtain the closure.