--- layout: docs title: Intersections permalink: /docs/intersections/ published: true --- ![]({{ site.baseurl }}/images/IntersectionOverview.png) Intersections are cross sections of the grid model that displays the grid cell values on planes that cut through the grid in various ways. There are two main types of intersections. The first one which simply is called **Intersection**, is defined by a piecewise linear curve and an extrusion direction. The curve can be either a Simulation Well, a Well Path, a user defined polyline, or a user defined line. The second intersection type is called an **Intersection Box**. An Intersection Box can be used as a box cutting the grid cells, or collapsed to a restricted axis aligned plane. All types of intersections are stored in a folder named **Intersections** in a **View** as shown below. ![]({{ site.baseurl }}/images/IntersectionInTree.png) ## Curve Based **Intersections** There are four types of curve based intersections: Well Path, Simulation Well, Polyline, and Azimuth and Dip. Azimuth and Dip differs from the other three curves, as it is defined just by one straight line. It is called Azimuth and Dip because the plane's extrusion direction can be defined by the two angles. Any of these intersections can be created by activating ![]({{ site.baseurl }}/images/CrossSection16x16.png) **New Intersection** from the context menu of the **Intersections** item in the Project Tree. They can also be created from the context menu in the 3D view, as described below.
To be able to see the intersections in the 3D view, the grid cells can be hidden by disabling the Grids item in the Project Tree or activating the Hide Grid Cells toolbar button.
### Common Curve Based Intersection Options The property panel of a well path based intersection is shown below: ![]({{ site.baseurl }}/images/IntersectionWellPath.png) - **Name** -- Automatically created based on the item specifying the intersection. The user can customize the name by editing, but will be updated if you change the well or well path. - **Intersecting Geometry** -- These options controls the curve to be used for the cross section, and depends on the type of intersection you choose. - **Direction** -- Horizontal, vertical or defined by two points. - **Extent Length** -- Defines how far an intersection for well path or simulation Well is extended at intersection ends. - **Show Inactive Cells** -- Controls if inactive cells are included when creating the intersection geometry. #### Direction The direction defined is used to extrude the curve in the defined direction, and thereby create a set of planes. When selection the **Horizontal** option, the start and end point of the curve is used as a baseline, and the horizontal direction is thus perpendicular to that line. When **Defined by two points** is the active option, the user can define the direction based on any two points. The direction from the first to the second point defines the extrude direction. - The background color of this list is set to light pink when adding points by picking in the 3D view is active. - To finish adding points, click the button **Stop picking points** in the **Property Editor**. - The background color of the point list is then set to white. ### Well Path Intersection A new **Well Path** intersection can be created by right-clicking the well path in the 3D view or in the **Project Tree**. ![]({{ site.baseurl }}/images/IntersectionWellPath.png) When a well path intersection is created, the source well path can be changed by using the **Well Path** selection combo box in the **Property Editor**. ### Simulation Well Intersection A new **Simulation Well** intersection can be created by right-clicking the simulation well in the 3D view or in the **Project Tree**. ![]({{ site.baseurl }}/images/IntersectionSimulationWellProperties.png) When a simulation well intersection is created, the source simulation well can be changed by using the **Simulation Well** selection combo box in the **Property Editor**. If the well contains more than one branch, the intersection geometry will be created for the selected branch in the **Branch** combo box. ### Polyline Intersection A new **Polyline** intersection can be created from the context menu in the 3D view. Then, by left-clicking on reservoir geometry, a polyline is created. The points are added to the point list in the **Property Editor**. ![]({{ site.baseurl }}/images/IntersectionPolyline.png) - The background color of this list is set to light pink when adding points by picking in the 3D view is active. - To finish adding points, click the button **Stop picking points** in the **Property Editor**. - The background color of the point list is then set to white. The points in the list can be deleted and edited using the keyboard. To append more points (by clicking in the 3D view), push the button **Start picking points** again. The points in the list can be copied to clipboard using **CTRL-C** when keyboard focus is inside the point list. A new list of points can be pasted into the point list by using **CTRL-V**. ### Azimuth and Dip A new **Azimuth and Dip** intersection can be created from the context menu in the 3D view. Then, by left-clicking two points on reservoir geometry, a single line is created between the first point, and the second point projected down to the plane with same z-value as the first point. The two points are added to the point list in the **Property Editor**. ![]({{ site.baseurl }}/images/IntersectionAzimuthDip.png) - The background color of this list is set to light pink when adding points by picking in the 3D view is active. - To finish adding points, click the button **Stop picking points** in the **Property Editor**. - The background color of the point list is then set to white. The points in the list can be deleted and edited using the keyboard. To append more points by clicking in the 3D view, push the button **Start picking points** again. The points in the list can be copied to clipboard using **CTRL-C** when keyboard focus is inside the point list. A new list of points can be pasted into the point list by using **CTRL-V**. When two points are picked, a plane between the points will appear in the 3D view, with a 90 degrees **Dip**, and the **Azimuth** angle calculated from the two points. The two angles can be edited in the **Property Editor** of the intersection, and is defined by the following: - **Dip** is the angle between the horizontal plane and down. - **Azimuth** is the angle between North and the plane. Changing the azimuth will rotate the plane about the first point picked in the 3D view. The length of the plane can also be set manually in the **Property Editor**. - **Length Up** is the distance from the user defined horizontal line, to the top of the plane intersecting the model. - **Length Down** is the distance from the user defined horizontal line, to the bottom of the plane intersecting the model. ![]({{ site.baseurl }}/images/azimuthDip3DView.PNG) ## Intersection Box and Intersection Planes A new **Intersection Box** or **Intersection Plane** can be created from the context menu in the 3D view or the context menu in the **Project Tree**. ![]({{ site.baseurl }}/images/3d_view_context_menu.png) The following list describes the properties for an **Intersection Box**: - **Name** -- Automatically created based on the item specifying the intersection - **Box Type** -- Box or x-plane, y-plane or z-plane - **Show Inactive Cells** -- Controls if inactive cells are included when creating the intersection geometry - **X Coordinates** -- Coordinates for x range - **Y Coordinates** -- Coordinates for y range - **Depth** -- Coordinates for depth range - **XY Slider Step Size** -- Defines how much the value changes when the slider for XY values is changed, default value 1.0 - **Depth Slider Step Size** -- Defines how much the value changes when the slider for depth values is changed, default value 0.5 Direct interaction in a 3D view is activated when **Show 3D manipulator** is pressed. Handles are displayed at the sides of the intersection object, and interactive modification is done by dragging a handle in the 3D view. ![]({{ site.baseurl }}/images/IntersectionBoxWithHandles.png)