Shearwater's depth imaging and model building capabilities
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Shearwater's depth imaging and model building tools incorporate well and cultural information into the same Reveal graphical user interface as all our other processing tools. This enables our geophysicists to combine surface seismic data with well logs and horizons to optimise the model building process.
The depth imaging tool-box includes:
Isotropic, VTI, TTI and Orthorhombic Kirchhoff
Isotropic, VTI, TTI and Orthorhombic Beam
Isotropic, VTI and TTI RTM
Q Kirchhoff and RTM
Migration from topography
The model building tool-box includes:
2D/3D visualisation of seismic, horizons, models and well data
Stack-sweep manual updating
Isotropic, VTI, TTI or Orthorhombic, non-parametric gridded tomography
Shearwater’s Full Waveform Inversion (FWI) uses the latest technology in building high-resolution Earth models for seismic imaging and interpretation.
FWI is an iterative tomographic technique, driven directly by differences between the true seismic data and synthetic data modelled with the estimated Earth model. All modelling is performed using accurate solution of the two-way wave equation, leading to much greater resolution in the inverted model than can be achieved through conventional ray-based tomographic methods.
Shearwater’s FWI is fully integrated within the Reveal platform, enabling easy incorporation of inversion into larger model-building workflows, for QC and for generation of intermediate Imaging products as the inversion progresses.
RTM (‘Reverse Time Migration’) is commonly used to image complex subsurface geologies, particularly in the presence of salt, where the salt structures severely alter propagating wavefronts.
The strength of RTM stems from its full solution to the two-way acoustic wave equation, improving imaging in areas where the complex geology violates the assumptions made in Kirchhoff or one-way wave equation migrations. The technique involves running the wave equation forward in time for the source modelling and backwards in time for the recorded receiver field for that shot and applying the imaging condition.
RTM can use all possible arrivals and handle sharp lateral velocity variations. The algorithm handles Isotropic, VTI and TTI media.