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Dip-steered auto-tracker to create a dense set of horizons

HorizonCube is a game-changing technology that impacts every level of seismic interpretation. A HorizonCube consists of a dense set of correlated 3D stratigraphic surfaces that are assigned a relative geological age. The technology was initially developed for sequence stratigraphic interpretation and as such was part of the SSIS plugin where it was called chronostratigraphy. Because the technology has a much wider application range the HorizonCube became a separate plugin in v.4.2. Henceforth SSIS is an add-on to the HorizonCube that focuses on sequence stratigraphic interpretation and Wheeler transformations.

Other applications of the HorizonCube include:

Detailed geologic model building
Low frequency model building for seismic inversions
Well correlations.

In the HorizonCube we typically create hundreds of chrono-stratigraphic horizons per sequence. Each sequence is bounded by mapped top and bottom horizons. Chrono-stratigraphic horizonsare either modeled (stratal slicing (also known as proportional slicing), parallel to upper - and parallel to lower horizon), or auto-tracked. The second generation 3D auto-tracker algorithm implemented in the HorizonCube tracks the dip/azimuth field to generate horizons that are typically separated by one sample at the starting position.

Optionally the user can smooth the dip-field and thus reduce the impact of random noise. An advantage of dip-steered auto-tracking is that dip fields are more continuous than amplitude fields. This is as opposed to conventional autotrackers that pick amplitudes and which lead to a set of patchy horizons rather than a set of continuous, chronologically consistent horizons.

To create a HorizonCube the user has to supply:

A steering cube (created by the Dip-Steering plugin)
At least two mapped bounding horizons
Mapped fault planes (optional).

Bounding horizons are either imported, or mapped in OpendTect. Here the user has two options: to use OpendTect's conventional amplitude & similarity auto-tracker, or to use the new dip-steered auto-tracking algorithm incorporated in the HorizonCube. The advantages of the latter are speed and watertight intersections at fault planes.

Also conventionally mapped / imported horizons can be made watertight at intersections with a new horizon trimming tool that comes with the HorizonCube plugin.

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HorizonCube applications

Well Correlation Panel
Neural Networks
CCB Fluid Contact Finder
Velocity Model Building
Seismic Spectral Blueing
Seismic Coloured Inversion
Seismic Feature Enhancement
Seismic Net Pay
Seismic Broadband
Workstation Access
GeoDataSync Accelerate
Deterministic & Stochastic Inversion