复杂近地表探区静校正量的地表一致性融合技术

Surface-consistent integration of different versions of statics in complicated near surface

复杂探区近地表条件的复杂性远超静校正方法的假设前提,利用不同静校正方法和参数计算的不同静校正量的试验对比结果往往表现为各自在不同区域和/或不同频段的优势,通常难以找到能较好解决整个工区静校正问题的单一静校正方法和参数。为实现不同静校正量的优势互补,提出了具有地表一致性特点的分频段与分区的静校正量融合技术,首先按照波长将静校正量分解成长、短波长2个频段或长、中、短波长3个频段的静校正量,再根据各自静校正量的优势频段和/或优势区域进行重构,形成最终的静校正量。南方山地2个探区的应用实例展示了该技术的应用思路和效果,一个探区表层岩性平面上明显区分为砂岩区和灰岩区,另一个探区含有隆起于地表的背斜构造,应用结果表明,叠加剖面质量都得到了明显改善。

The near surface condition in complex exploratory areas has a complexity that is far beyond the hypothetical assumptions of common statics methods.Different statics methods and parameters could generate different comparative test outcomes which always show varying dominant zones or frequency ranges.It is usually difficult to single out one statics method and parameter set to well solve statics problem across a whole target area.In order to achieve the complementarity of different statics,we propose an approach of surface-consistent integration of statics in subband and subarea mode.First,each version of statics is decomposed into two components of frequency ranges(long and short wavelength)or three components of frequency ranges(long,medium,and short wavelength).The final statics was obtained by reconstructing these components in respect to the dominant frequency range or zone.Two practical examples from mountainous exploratory areas of south China were given.One of them has a distinguishable lithological division of sandstone zone and limestone zone,whilst the other one is characterized with an uplift anticline structure.Stack sections showed distinct improvement in both of the areas,indicating the effectiveness and flexibility of the method.