Two dimensional common reflection surface stack based on the Fresnel zone
二维菲涅耳带共反射面元叠加方法研究

The Common Reflection Surface(CRS) stack can improve signal-to-noise ratio of seismic exploration.However,the key issue to improve the resolution is how to set CRS stack aperture.In this paper,we discuss the characteristics of Fresnel zone during the reflection of seismic waves and suggest that the Fresnel zone at the condition of undulate layers can be approximated with ellipses.Then we bring forward a method to determine the aperture size of CRS stack based on Fresnel zone and use it to deal with seismic profile of the steep slope of Miyang Depression.The results show that Fresnel zone based CRS stack improves both the signal-to-noise ratio and resolution because the stacking scope determined by Fresnel zone maximizes the energy of seismic signals.Particularly,weak seismic information in deep zone is preserved and displayed,while the normal CRS stack can only improve the signal-to-noise ratio and the shallow seismic information.