反射系数随入射角变化对水平多次叠加的影响

THE VARIATION OF REFLECTION COEFFICIENT WITH INCIDENCE ANGLE AND ITS EFFECT ON HORIZONTAL MULTIPLE COVERAGE

本文简述了反射系数随入射角变化的规律,讨论了目前地震生产中入射角的变化范围;通过数学模型研究了反射系数随入射角(或偏移距)的变化对水平叠加的影响;给出了一种能消除这种影响而又较容易实现的方法,不过这种方法同时降低了多次叠加对随机噪声的压制能力。本文建议在没有出现可替代多次叠加的方法以前,可通过认真的远道切除来降低反射系数随入射角变化对叠加的影响。

This paper describes briefly the rule that reflection coefficient varies with incidence angle and the variation range of incidence angle in the seismic operation at present. By mathematical model, reflection coefficient varies with incidence angle (or offset) affects the horizontal stack is discussed. And an easily-implemented approach which can get rid of the effect is advanced. However, it has a disadvantage which is the capability of multiple coverage in suppressing random noise is reduced also. The paper suggests that we might as well use the first break muting to diminish the effect resulted from the variation of reflection coefficient with incidence, angle on multiple coverage until an alternative for multiple coverage comes into being.