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Imaging

RTM, custom imaging conditions, the reflection-FWI velocity gradient, and angle-domain common-image gathers.

  • RTM Acoustic Marmousi

    RTM · Acoustic · Marmousi

    Reverse-time migration on full 12.5 m Marmousi with a 15 Hz Ricker — the RTM image as the gradient of an inner-product loss through the boundary-saving backward, with background subtraction, near-offset mask and illumination compensation. A clean reflectivity image in <3 s on 30 shots.

    Open notebook

  • Custom gradients

    Custom gradients · imaging condition

    Register your own imaging condition — override the default correlation with a user-defined gradient kernel via the autograd hook and compare it to the built-in one.

    Open notebook

  • RWI velocity gradient

    Reflection FWI · where the velocity gradient comes from

    The RWI velocity gradient splits into a transmission half and a reflection half from two equations: Acoustic gives term I, AcousticLSRTM gives II+III+IV. Shows the paper's eq. 15 identity, how to weight the image-point term III with the paper's beta, and the same anatomy in 3-D, where the wavepath becomes a pair of tubes and the image point a Fresnel-zone patch.

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  • ADCIG

    ADCIG · Poynting (custom backward)

    Angle-domain common-image gathers via a custom imaging condition plugged into the eager backward with register_gradient — Poynting-vector recipe. For the space-lag ADCIG (2D + 3D, CUDA compute_adcig) see the next card.

    Open notebook

  • Space-lag ADCIG

    ADCIG · space-lag (2D & 3D)

    Subsurface-offset extended imaging condition (Sava & Fomel) via the built-in CUDA compute_adcig toggle, then slant-stack to angle. Boundary-saving path, acoustic 2D & 3D.

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