Application of the Common Reflection Arc Stack Method in Seismic Imaging of Volcanic Rocks

Abstract

In conventional stack methods, reflection events in a stack gather are generally assumed to come from the same reflective point under the ground. Whereas the reflective wavefield received is indistinguishable when its scope is less than the Fresnel's zone. Based on the characteristic of lava, we use arc to describe the reflective interface. Along the arc interface, reflections coming from the Fresnel zone are summed, so that the number of coverage is enhanced greatly. The aim of increasing the energy of signal and improving the quality of stack images is also attained. The relation between parameters of travel time and the interfaces of arc subsurface is presented. The steps of stacking are also given. Computational results show that the method of arc stacking can increase both the ratio of signal to noise in sections and the continuity of cophase axes in reflective events effectively.

Two Dimensional Common Reflection Surface Stack Based on the Fresnel Zone

“…Therefore, it is necessary to do a compensation for the approximate Fresnel zone for more accurate purpose. Considering that the NMO velocity is approximately equal to the layer velocity divided by cos ϕ of which ϕ is the dip of strata under the condition of single layer interface model [21,22] . We conduct the same process to the Fresnel zone.…”

Optimized non-hyperbolic stack imaging based on interpretation model

“…The second stack imaging theory is non-hyperbolic stack imaging. With this theory it is thought that the t-d curve of complex geological media is non-hyperbolic, hence the data would not be stacked on the basis of hyperbolic curves (Pei, et al, 2004;Yang and Ma, 2005).…”