Wave field modeling
Seismic wavefield modeling is used to investigate the capabilities of the processing graph in terms of the tasks of determining various parameters of both the processing itself and the features of the seismic environment for:
3. identification of Velocity-Depth Model parameters responsible for the stability of seismic image elements creation, responsible for low-contrast singular geological structures (e.g., karsts/fault systems, etc.);
4. identification of sufficiency of observation system geometry parameters for reconstruction of certain seismological structures in a given angular range of illumination;
5. other research tasks.
Dynamic modeling tasks in 3D are solved by using specialized parameters of the BI-WFT 3D Cluster plugin. Kinematic modeling tasks are solved by using BI-WFT 3D Cluster and Kinematic+Amplitudes Modeling 3D plugins. Dynamic modeling in 2D is realized by using the Bidatuming module.
In terms of the creation of the seismic response to the input impulse, the solution of the modeling problem in Prime is divided into 3 types:
1. The seismic response is created based on discontinuities in the elastic parameters of the medium described by the used reservoir Velocity-Depth Model. Then the solution is made by using Boundary-Integral technology. To create "benchmark" seismograms associated with the specific boundary of the Velocity-Depth Model, it is possible to use a "single" response, independent of the dip/reflection angle.
2. The seismic response is formed based on the Kirchhoff-type migration operator. As a function of the response of the medium to the input impulse at a certain angle of incidence in the Born approximation, either mesh models of the elastic parameters Vp/Vs/Rho, or Intercept/Gradient cubes from the Fatty model are used to describe the dependence of the amplitude from the angle of incidence/reflection.
3. The creation of hybrid solutions on the basis of calculated local seismograms by finite-difference methods on the top of the target layer with subsequent polarization filtering of waves of the desired type of polarization and transfer of the obtained fields to the observation geometry. In this technology, the response function of the medium in the target area on the top of this area is determined by the methodology of calculation of special local short seismograms, then the correct transfer of "virtual" sources and receivers to the observation geometry on the free surface is performed on the basis of the background Velocity-Depth Model based on the wave-field transformation technique.
From our point of view, only with the help of modeling it is possible to make an actual estimation of the level of accuracy of the results of seismic data processing procedures for specific seismological environments.