3D diffraction imaging of fault and fracture zones via image spectral decomposition of partial images

The paper presents 3D diffraction imaging based on the spectral decomposition of a different combination of selective or partial images. These images are obtained by the pre-stack asymmetric migration procedure, which is weighted data summation. Spectral decomposition is done in the Fourier domain with respect to spatial dip and azimuth angles. Numerical examples with the application of different workflows for the synthetic and real data examples demonstrate detailed reliable reconstruction of the fractured zones and reliable reconstruction of fracture orientation on synthetic and real 3D data examples.     

“Exact” Frequency-Dependent Rays in Acoustic Media and Their Properties

Doklady Earth Sciences - The numerical algorithm for tracing “exact” frequency-dependent rays, which makes it possible to trace these rays in arbitrary media is proposed. In addition, a...     

Reconstruction of the Near-Surface Model for the Conditions of Eastern Siberia Using Full Waveform Inversion

Doklady Earth Sciences - An approach to reconstructing a velocity depth model of the near surface using full wave inversion is proposed, implemented, and tested. We have shown previously that,...     

Reconstruction of a depth velocity model by full waveform inversion

Doklady Earth Sciences - The consecutive numerical method is implemented for construction of a depth velocity model by full waveform inversion. The inverse dynamic seismic problem is reduced to...     

Solving an Inverse Dynamic Seismic Problem by Multicomponent Elastic Full Waveform Inversion

A numerical method for solving an inverse problem of the theory of seismic wave propagation, relying on the modified least square method, is proposed, substantiated, and implemented. The proposed modification is based on the decomposition of the velocity model of the geological medium into the subspaces of smoothly changing propagators and sharply changing reflectors. The modified functional exhibits strong nonlinearity relative to the macro-velocity component, since the operator M, which transforms the time reflector to the space reflector, depends on it significantly. However, the low dimensions of the subspace of the macro-velocity models make it possible to use quite effective minimizing methods successfully.

     

Development of a Methodology for Monitoring the State of Methane Hydrate Deposits of the East-Siberian Shelf

Doklady Earth Sciences - One of the possible mechanisms causing significant emissions of methane into the atmosphere within the Arctic shelf may be the decomposition of gas hydrates. Their...