Seismotech, Ltd. will present a report at the Conference "St. Petersburg-2022. Geosciences: Time for Change, Time for Chance" in April, 2022.

Seismotech, Ltd. will present a report at the Conference "St. Petersburg-2022. Geosciences: Time for Change, Time for Chance" on April 11-14th, 2021

"Possibilities and advantages of "depth-oriented" processing of seismic data in the concept of layered parameterization of the medium"

The speaker: Kirill Ovchinnikov

The authors are: Ruslan Anisimov, Kirill Ovchinnikov, Oleg Silaenkov, Dmitri Finikov, Andrey Shalashnikov

It is clear to specialists today that pre-stack depth migration must be performed in processing to obtain data suitable for interpretation. Time migration (migration with the usage of average velocity models), which was the industry standard 20-30 years ago, is suitable only for the work in a narrow class of simple medium. If, however, it is necessary to consider refraction of elastic waves in order to describe the medium – the average velocity models are no longer suitable. Because of this, the time migration has gone into the background, because modern seismic surveys are increasingly demanding in terms of structural analysis and reconstruction of dynamic parameters of seismic records.

Despite general acceptance of the disadvantages of time migration in the average velocity model, signal processing is still traditionally performed in the concept of average velocity models. However, parameterizing (describing) the wave field in this way, "hyperbolizing" the reflected wave hodographs, we will inevitably distort the information that should be used during depth migration.

The approach discussed in the report, using a generalized layered model of the medium and describing near-surface anomalies in it, gives the maximum benefits from "model-oriented" processing with the following interpretation.