Horizon volumes are volumes which depict stratigraphic intervals and can be stacked together to represent a geological sequence. Horizon volumes have multiple functions within GeoTeric, they can be used as an extra data source to the adaptive geobodies tool or the up and coming IFC+ tool to provide additional stratigraphic/horizon constraint. They can act as an overlay volume in the opacity blend to show different units, they can be used with the Cookie cutter to mask out zones of interest from attribute volumes as well as in the parser as a control volume.
The first step is optional, depending on the number of horizons you have loaded into the project and the intricacy of the horizon volume that you require. Using GeoTeric’s Iso-Proportional Slicing tool create a series of iso horizons. These can be isoproportional, parallel, conformant or truncating.
Export the boundary horizons. In horizon tools > crop/cut, crop a seismic volume to each interval by choosing upper and lower horizons for the interval using the binary option. This is the most time consuming step, because each interval needs its own volume. This is commonly referred to as a ‘Horizon mask volume’ in GeoTeric.
Finally, once you have a number of horizon mask volumes, representing each stratigraphic interval you can add them together in the parser. Each interval is given its own unique value. A parser expression of the form (im1>0)*value1 + (im2>0)*value2 + (im3>0)*value3 etc. The volume can then be visualised with a spectrum colour map as seen below.