Applications of post-stack migration types in seismic data


Rahimov Y., ALP H.

20th Anniversary of the 1999 Marmara Earthquakes: 23rd Active Tectonics Research Group Meeting, İstanbul, Türkiye, 15 - 18 October 2019, cilt.1, no.1, ss.116

  • Cilt numarası: 1
  • Basıldığı Şehir: İstanbul
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayısı: ss.116

Özet

In this study, various migration techniques were applied to the data obtained
after routine data processing steps were applied to multichannel seismic reflection
data and the positive and negative aspects of these techniques were analyzed after
comparison of these migration types within and between each other. The applied
migration types are Kirchhoff migration, Finite Difference Migration, Wave
Equation Migration and Time Migration After Stack.
Data processing steps were carried out in the seismic data processing
laboratory of Istanbul University - Cerrahpaşa Geophysical Engineering using
Paradigm ECHOS program.
The seismic migration process is a data-processing stage with a wave equation
that carries the sloping reflections in the seismic section and eliminates the energies
of scattering at fault boundaries. The aim of this process is to make the seismic stack
section similar to the geological section. It is tried to simulate the geological crosssection in the mound section. The reason that the geological section is not similar to
each other is that the underground environment is inclined. In operations up to
migration, the underground environment is considered to be flat, and reflection points
are treated as if they were reflected from the center of the shot-receiver. Migration
carries these inclined events to their real places and discards some of the effects
caused by the slope. These are the effects of bow tie-tie, anticline and synclinals, and
the location and size of inclined events. After the migration process, it is tried to
eliminate the effects of bow tie ties that occur due to synclinals, while events such as
anticline are narrowed and events such as syncline are widening and the slope of the
structures located in the mound section increases after migration process. The success
of removing these effects depends on the parameters used during the migration
process.
After the stack process, migration process was started and four types of migration
were applied. Firstly, the effect of migration on the cross-section was investigated by
making parameter changes within these migration types. Then, using the most
successful parameter for each type of migration, the cross-sections were compared
with each other, and the success in the mound was compared to the geological
environment.