Two Dimensional Common Reflection Surface Stack Based on the Fresnel Zone

Abstract

Common Reflection Surface (CRS) stack can improve signal-to-noise ratio of seismic signals. However, the key issue to improve 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 under undulate layerinterface condition can be approximated with ellipse. 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 section of the steep slope belt in Miyang Depression. The results show that Fresnel zone based CRS stack improves both the signal-to-noise ratio and resolution because the stacking aperture determined by Fresnel zone maximizes the superposition energy of seismic signals. In addition, deep weak seismic information is preserved and displayed, while normal CRS stack can only improve the signal-to-noise ratio and the shallow seismic information.