Assigning data to a structural model

With the Assign Data form (model > 3D Structure > Assign Data) you define the input data to the 3D structural model. There are three main inputs that you need to define; the zonation, defined by the stratigraphic model, the underlying data, defined by data representations, and (optionally) a fault model.

The zonation is defined by the stratigraphic level you select in your stratigraphic model. The stratigraphic level determines which surfaces, and as such which zones, will be created in the structural model. Each event that has been assigned to the zone boundary must have at least one data representation in the selected Source and/or Marker set. This can be a dense data representation (a tri-mesh, 2D grid, polyline set, point set) or a sparse data representation, i.e. a marker. All data representations that exist for a particular event in the assigned Source and Marker set will be assigned and used for the structural model building (for how the application handles the combination of dense and sparse data representations, see Dense and sparse data within a single event). Events without underlying data representations are not allowed.

The first column in the table on the form (Name) lists all the events in the Stratigraphic Model. The columns to the right indicate whether surface or marker data are present in the selections you made in the drop-down lists Source and Marker set. Representation icons next to those columns give information about the geometric representation (polyline, 2D grid, tri-mesh, point set or marker).

To assign data to the 3D structural model

1. At the top of the form, under Model, select the 3D Structural Model that you want to create.
2. Optionally, select a Fault model to be incorporated in your 3D Structural Model.
3. Select the Stratigraphic model that contains the events on the basis of which you want to build your 3D Structural Model.
4. Specify the Stratigraphic level; all events at the selected level will be built as continuous surfaces in the 3D Structural Model. Upon selection, these events are listed in the Name column in the table below.
   You can choose to first build your 3D Structural Model at a high stratigraphic level, in which only a few surfaces are generated. E.g. the top and bottom of your reservoir. When you are satisfied, you can revisit the 'Assign data' form in another iteration and increase the level to generate additional surfaces in your structural model. Previous edits on e.g. Fault Cutoff Line edits that are made to the already existing surfaces are maintained.
5. Optionally, select the Source that contains the events and data representations. This can be either a surface set or a seismic interpretation. Upon selection, the table below indicates for each event whether a data representation exists in the selected source.
6. Select the Marker set that contains the markers you want to use in your 3D Structural Model. Upon selection, the table below indicates for each event whether a marker is available in the selected marker set. The selection of a marker set is optional if all events selected are already represented by surfaces.
Important   All events listed in the Name column need to have a data representation (i.e. a polyline set, 2D grid, tri-mesh, point set or marker), else the surface cannot be constructed. JewelSuite Subsurface Modeling prompts a warning in the table on the form when underlying data is missing.

At this point, all the input data to the 3D Structural Model is selected. This data is used as follows:

• If an event is represented by a marker only, the surface in your 3D Structural Model will be constructed based on this marker.
• If an event is represented by another surface representation (i.e. a polyline set, 2D grid, tri-mesh or point set) the surface in your 3D Structural Model will be (re)constructed based on that representation, even when that surface already existed as a tri-mesh (the new tri-mesh will be constructed based on the modeling parameters that you will define in the next step of the workflow).
• Sometimes an event is represented by a surface representation as well as a marker, see Dense and sparse data within a single event.
7. Reset to default  (Optional, only enabled when a model is already assigned to the selected structural model)    It is recommended to select this option only when you have added one or more dense surfaces to your selected source model. When you select this option, the following settings on the Edit Model form are reset to the default options:
• Interpolation Method
• Fault Block Aware
• Prevent Horizon Creep
• Dense Point Set
8. Click OK to assign the surfaces to the 3D Structural Model and proceed to the next form in the workflow, Set Modeling Parameters. You can also click Apply to assign the surfaces and remain in the Assign Data form for additional surface and marker data assignment.

Upon assign of the input data, the faults are directly added to the 3D Structural Model in the JewelExplorer. However, stratigraphic surfaces are not yet available as they will be constructed with the Construct Surfaces step later in the Structural Modeling workflow.