SV-P Imaging Compared to P-SV Imaging: Analysis of Statics and Velocities Required to Create an SV-P Image
Presented at the 2017 SEG Annual Meeting in Houston
Standard 3D seismic data recorded into traditional vertical geophones can produce an SV-P converted-wave data volume. However, there is a challenge in resolving both the statics and velocities while separating out the SV-P image from the P-wave portion of the data. The primary difficulty is in resolving the velocity and statics associated with the signal of interest, SV-P, which is buried in the slower velocity and deeper time portion of the seismic P-wave record. In other words when looking at a gather in offset order and moved out with a P-wave velocity, you will often see many under moved out events and more of those events with increasing time. This is the portion of the gather that has always been referred to as containing noise, coherent noise, multiples, and mode-converted responses. This presentation looks at a real-data example which took advantage of using the traditional P-SV processed converted-wave-stack velocities and statics as the basis for looking for the SV-P equivalent stack. In particular, if we know the velocity field and the final P-SV stack from traditional converted wave data, can we successful resolve statics and velocities to create the SV-P image? This data example shows it can be done.