Seismotech, Ltd. will present reports at the 9th International Geological and Geophysical Conference and Exhibition "GeoEurasia-2026. Geological Exploration Technologies - Science and Business" on March 31st – April 4th, 2026, in Russian State Geological Exploration University by Sergo Ordzhonikidze (MGRI), located at bld. 23, Miklukho-Maklaya Street, Moscow
Within the Conference "GeoEurasia-2026" we are pleased to invite you to attend the following reports:
1. Multichannel adaptation filters in the (f-x-y) domain.
The speaker: Anisimov Ruslan, Leading Software Developer, Seismotech Ltd.
The authors: Anisimov Ruslan, Finikov Dmitriy
Multichannel filters calculated in the (f-x-y) domain have been previously discussed in the context of solving problems related to irregular noise suppression and seismic data interpolation. The application of algorithms for processing irregular spatial observations was considered. .
The report will discuss the use of filters for wavefield adaptation in various processing tasks. The combination of wavefield modeling algorithms and their adaptation to real observations is essential. A distinctive feature of the discussed class of algorithms is the capability for kinematic transformation of the adaptable field, while single-channel procedures have rather limited capabilities. .
The report will present examples of these procedures testing using both model and real data.
2. Wavefield Adaptation and Subtraction.
The speaker: Kireeva Alina, geophysicist, Seismotech Ltd.
The authors: Kireeva Alina, Finikov Dmitriy
Wavefield adaptation and subtraction is one of the most widely used processing procedures at various stages of data processing. Typically, noise suppression is divided into two main stages: noise modeling and adaptive subtraction.
This approach is most clearly demonstrated in multiple wave suppression, but a similar sequence of actions is also applied during wave separation based on kinematic characteristics. In these cases, the modeling stage is replaced by various noise extraction procedures. The dynamics of these noises may be distorted, and these distortions are compensated either before or during the subtraction process. During this process, the noise field is adapted to the field representing the sum of useful signals and noise. The main challenge of subtraction is to avoid distorting the useful signal during the procedure.
The most common used adaptation methods describe distortions of the adapted field’s shape through channel-wise convolutions with filter operators. Such distortions will be referred to as the convolutional ones.
However, noise modeling almost always involves multiplicative distortions, requiring the identification of functions that distort the amplitudes of subtracted noises. It is important to note that both types of distorting effects cannot be considered arbitrary. While convolution operators can always be found to transform one field into another, rapidly changing multipliers can achieve the same result. Adaptation functions must always be subject to certain constraints.
Also there are more advanced adaptation algorithms implemented by multichannel non-stationary procedures, but they solve a different class of problems and we do not discuss them right now.This work examines the interaction of adaptation algorithms aimed at compensating for non-stationary and convolutional differences between the adapted field and the field containing the sum of signals and noise.
3. Method of Common Angle Gathers Building in the Process of Depth Migration of the Seismic Field in Reverse Time.
The speaker & the author: Shalashnikov Andrey, Leading Software Developer, Seismotech Ltd.
In order to obtain the dynamic parameters of the wavefield in the depth domain after the seismic data migration, the one of the primary sources of information are the migrated common angle gathers. After the well tie execution using the waveform, these data are used directly to obtain dynamic attributes and solve inverse dynamic problems such as synchronous seismic inversion.
Such angular gathers obtaining during the Kirchhoff-type migration can be performed directly based on the angular characteristics of the ray scheme of the migration integral operator. In cases where a complex depth-velocity medium model is used to account for non-ray effects during wavefield transformation, as well as for proper consideration of the multivalued configuration of the wavefront of the summing operator’s Green’s function, the reverse time migration (RTM) might be used. Such a migration can be performed using various techniques; in this case we focus on data migration, where the data were sorted by common source or receiver points.
The paper proposes a method for common angle gathers forming for this type of migration. The algorithm’s foundation involves generating local seismic event dips based on preliminary migration results and a method of rapid decomposition of the direct wave field in the imaging area into angular components corresponding to specified angular ranges.
