MultiFocusing

The MultiFocusing group contains modules that implement the Multifocusing (MF) seismic imaging technology. Multifocusing is a data-driven stacking and imaging method that optimally focuses seismic energy along curved reflection surfaces without requiring an explicit velocity model. It estimates kinematic wavefield attributes — the zero-offset (ZO) and common-offset (CO) focusing parameters — by searching for the stacking operator that maximises coherence across a local data aperture. These attributes are then used for data enhancement (stacking), migration imaging, traveltime tomography, and geometry QC.

The group is organised into engine modules (parameter search), data-enhancement modules (stacking with MF operators), imaging modules (migration using MF kinematic attributes), and utility/QC modules. The following modules are available:

2D Hi Search — performs the high-resolution MF parameter search for 2D data, estimating ZO-MF kinematic attributes with enhanced lateral resolution.

3D Anizo search — performs the 3D MF parameter search with anisotropy, estimating azimuth-dependent focusing parameters for anisotropic velocity analysis.

Convert MF DB — converts a Multifocusing parameter database between storage formats or coordinate systems for compatibility with downstream processing steps.

Convert ZO-MF corridor file to picking item — converts a zero-offset MF corridor (mute zone definition) file into a picking item object that can be linked to MF engine or imaging modules.

Data Enhance - 2D CO-MF — stacks 2D common-offset data using MF operators to produce an enhanced, noise-suppressed common-offset section.

Data Enhance - 2D CO-MF (ext) — extended version of 2D CO-MF data enhancement with additional options for operator aperture and weighting.

Data Enhance - 2D ZO-MF — stacks 2D data onto the zero-offset section using ZO-MF operators, producing a high-quality simulated zero-offset stack.

Data Enhance - 3D CO-MF — stacks 3D common-offset gathers using MF operators for 3D data enhancement and noise attenuation.

Data Enhance - 3D CO-MF - ext — extended version of 3D CO-MF enhancement with additional operator and weighting controls.

Data Enhance - 3D ZO-MF — stacks 3D data onto zero-offset using MF operators to generate an enhanced 3D zero-offset stack volume.

Data Enhance - 3D ZO-MF (new) — updated 3D ZO-MF enhancement implementation with improved algorithm for large 3D datasets.

EG Fold 3D — computes and displays the effective gather fold in 3D MF processing, used for QC of the data coverage and aperture adequacy.

Engine - 2D CO-MF — runs the Multifocusing parameter search engine for 2D common-offset data, searching for the optimal CO-MF stacking operator at each output point.

Engine - 2D ZO-MF — runs the MF parameter search engine for 2D data to find the zero-offset focusing operator that maximises coherence at each midpoint-time location.

Engine - 3D CO-MF — runs the MF parameter search engine for 3D common-offset data, producing a 3D CO-MF attribute volume for imaging and enhancement.

Engine - 3D ZO-MF — runs the MF parameter search engine for 3D data in zero-offset mode, building a 3D ZO-MF kinematic attribute database.

Engine-3D CO-MF Constrain — runs the 3D CO-MF engine with geometric constraints applied to the parameter search to stabilise the solution in areas of low fold or complex structure.

Engine-3D CO-MF Old — legacy version of the 3D CO-MF engine, retained for backward compatibility with older processing flows.

Engine-3D ZO-MF Old — legacy version of the 3D ZO-MF engine, retained for backward compatibility with older processing flows.

Export CO-MF results — exports the CO-MF parameter database to an external file format for archiving or use in third-party velocity analysis tools.

Export ZO-MF results — exports the ZO-MF kinematic attribute database to an external file for archiving or integration with interpretation workflows.

Geometry Extractor From MF Storage — extracts acquisition geometry information stored within the MF database and converts it to standard geometry objects for use in other processing modules.

GMulti Focusing Geometry 3D Old — deprecated legacy module for 3D MultiFocusing geometry setup; use the current Engine 3D modules for new projects.

Imaging - 2D CO-MF — migrates 2D common-offset data using CO-MF kinematic operators to produce a focused image in the midpoint-time or depth domain.

Imaging - 2D ZO-MF — applies ZO-MF migration to 2D data to produce a focused time-domain image using the estimated zero-offset kinematic parameters.

Imaging - 2D ZO-MF multi DB — applies ZO-MF migration using multiple MF databases, combining results from different search passes to improve image quality in complex areas.

Imaging - 3D ZO-MF — migrates a 3D seismic dataset to produce a focused 3D image using the 3D ZO-MF kinematic attribute database.

MF DBs merge — merges two or more Multifocusing databases into a single combined database, useful when processing large surveys in overlapping tiles.

MF Fold 3D — computes the trace fold used in the 3D MF stacking operator for each output bin, supporting QC of the MF aperture coverage.

MF Interpolator Distributed — spatially interpolates a Multifocusing parameter database using distributed computing, filling gaps in the attribute grid caused by low data fold or acquisition irregularities.

MF Mute Factor — computes and applies a mute factor to the MF stacking operator, tapering contributions from traces at large offsets or azimuths to suppress noise in the enhanced output.

MFParams to time arrivals — converts stored MF kinematic parameters to traveltime picks for input to reflection tomography or depth model updating (deprecated).

MFParams to time arrivals (common offset) — reads MF parameters from common-offset SEG-Y files and converts them to traveltime picks for tomographic inversion (deprecated).

Migration imaging - 2D ZO-MF — performs post-stack time migration of a 2D ZO-MF enhanced section using the velocity field derived from the MF attribute database.

Mute Factor Visualization — displays the mute factor applied during MF stacking as a function of offset or azimuth, supporting QC of the aperture tapering.

Parameterization - MF Engine — defines the search grid, aperture, and coherence measure parameters for the MF engine, controlling the quality and speed of the parameter search.

QC 2D MF Geometry — checks the acquisition geometry stored in the MF database for inconsistencies, flagging traces with incorrect source-receiver assignments or missing coordinates.