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.
Applications of the HorizonCube include:
Note: as of v.6.05 (August 2016) the plugin supports a constrained inversion-based 2D and 3D HorizonCube algorithm in addition to a dip-steered tracking algorithm.
"The HorizonCube unlocks the stratigraphic information encoded in the immense number of local reflectors that are typically found between regional markers."
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:
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.