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在三维资料偏移处理中,偏移速度是决定处理效果的关键参数。本文以文北三维偏移为例,讨论了偏移速度的选取和处理效果。实际偏移速度可用下述办法选取:首先根据不同构造部位的地层倾角修改叠加速度,然后把此修改后的叠加速度以不同的百分比在二维叠加剖面作偏移试验。在此基础上选出较为合适的叠偏速度,用于三维偏移,便可取得较好的偏移效果。
In three-dimensional data offset processing, the offset speed is the key parameter that determines the processing effect. In this paper, we take the example of North 3D migration to discuss the selection and processing effect of migration velocity. The actual migration velocity can be chosen as follows: Firstly, the stacking velocity is modified according to the dip of strata of different tectonic parts, and then the modified stacking velocity is tested in two-dimensional superimposed sections with different percentages. On this basis, select the more appropriate stack bias speed, for three-dimensional offset, you can get a better offset effect.