OpendTect User Documentation version 4.2
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4.11. Well

The user can load an existing well, tie a well to seismic or create a new welltrack.

Basic Well Pop-up Menus
The wells are displayed in a scene using this tree element. The pop-up sub menus are described briefly in the following text.

Well popup menu

Individual well pop-up menu. In the tree, right-click on a loaded well name to launch this menu.

Note: The above pop-up menu will appear only if a well has already been added in the tree/scene. Use the menu "Load" to add a well in the scene. When no wells are loaded in the scene, the menu will reduce to three sub menus: Load, Tie Well to Seismic, and New Well Track.

Load: Wells are displayed in the scene using Load option.

Tie Well to Seismic: The seismic to well tie is also supported. Three parameters will be needed for a well in order to tie the seismic to a well: sonic/velocity log, density log and the reference wavelet. The wavelet can be imported or extracted. The logs can also be created in the Well Manager.
New Well Track: OpendTect also supports an option to create a new well track in an active 3D scene. When this sub menu is selected, the system will prompt for a new well track name. After specifying a new well track name, display an element (inline/crossline/2D line) in a scene. Use mouse clicks on the displayed element to draw the well track. After the track has been created, right click on the new well track name and select the option Save. It may be noted that drawing a new well track works in a same as editing an existing well track. Well nodes can be picked on the elements currently displayed in the scene. Remember that a display with a Z-scale (View - Z-scale) other than 1 distorts the appearance of distance in the 3D view.

Multiple Well Options
These options are available only when more than one well is loaded in the tree, and can be accessed by right-clicking Well in the tree. The new options available when multiple wells are loaded include: Create attribute log, Show all, Hide all, Show all items, Hide all items, and Remove all items. Items described in the previous sections above will not be described again here.

Create Attribute Log option creates a selected seismic data as a log for multi-wells.
Constant Log Size option keeps a well log display width relative to a scene zoom ratio i.e. a log display width increases with the zoom in and vice versa. However, this option can be toggled off by clicking on the sub menu item (Basic Well Pop-up Menus). In the later case, a log display width is adjusted opposite to the zoom i.e. if a scene is zoomed in, a log display width is reduced relative to the scene zoomed in ratio and vice versa.

Show all allows the user to toggle on all well names (top),well names (bottom), markers, marker names, and logs.

Hide all allows the user to toggle off all well names (top),well names (bottom), markers, marker names, and logs.

Show all items allows the user to toggle on all wells currently loaded and visible in the tree.

Hide all items allows the user to toggle off all wells currently loaded and visible in the tree.

Remove all items allows the user to remove all wells currently loaded and visible in the tree. This only removes the wells from the scene, it does not delete them from the disk.

Individual Well Options
Once a well has been loaded into the scene and is visible in the tree, right-clicking the well pops-up a window with the following options: Create attribute log, Tie well to seismics, Properties, Edit well track, Save, Lock, 2D log viewer and Remove.

Create attribute log allows the user to create a new log by calculating an attribute along the well track. A new window pops up where the attribute, log name, and the depth range should be provided. The Depth range is defined as start depth, stop depth, and sample distance.

Properties sets various display settings of a well track, the logs, and the markers. The properties can be set for each well and can also be updated for all wells displayed in a scene. The later can be done using the button Apply to all wells available in the Well Display Properties window.

Well Track Properties: The track properties are modified in this tab. The track line thickness is changed by scrolling the Line Thickness spin box. The well track/name colour is updated by pressing the coloured button. The well name can be displayed above and below the track. The name size can also be increased or decreased. It may be noted that the name size is adjusted relative to the 3D zoom.
Well Marker Properties: Well marker properties tab include the settings for marker's name size, colour, shape (3D), etc. The marker size is adjusted using the spin box (up/down). The limits for the size are set from 1 to 100. The colour of all markers of a well track can be changed in to a one unique colour. This is supported by the 'use single color' option. If the same colour is to be assigned to all available well markers, set check to this field and select the colour. Additionally, three different 3D shapes are supported (Cylinder, Sphere, Square). The cylindrical shape is added for orthographic camera displays, which is better for the visualization purposes. The height of a cylinder is supported.	Well marker's properties tab
Well Log Properties: In a scene, the log are displayed using the Left Log and Right Log tabs. The logs are displayed on the left and/or on the right of a well track according to a current view. The log properties include the log selection, log range, fill colour and the the thickness of the log line. None refers to no log selection/display. If the logs are already imported, the Select log should contain the name of the logs in the drop down list. The data ranges and the colour ranges are updated automatically from the selected log. However, both fields are editable. Two types of log displays styles are supported. For a standard log trace display style Well log radio button is selected. For a wiggle display, the Seismic radio box is selected. The well logs can be filled with any selected colour table. The colour ranges can also be manually set/clipped. However, the seismic style contains different settings. The synthetic seismic traces can be displayed by toggling the Seismic radio box ON. The seismic traces can be repeated by specifying the repetition numbers in the spin box adjacent to the Repeat text. The Overlap field refers to the overlap percentage of the repeated traces. Optionally, dual logs spectra can be displayed together on the same side by displaying one log as a trace and filling the colour with another log (Fill with Log).	Well log properties tab

Edit Welltrack allows you to add or delete nodes to the well track. Deleting nodes is done by holding CTRL and clicking a node. Adding nodes is done by making "node picks" on any of the active elements on your screen. Remember that the Z-scale caused a vertical stretch, distorting the appearance of real distance in the 3D view.

2D Log viewer
This property allows you to display a well log in a 2D scene. The display in log viewer is driven by the 3D scene. To interactively display different logs, go to the well properties and make change.

Save stores a new well or saves the changes that were made to an existing one. Provide a name for a new well, and if a depth to time model is available, select the file. The file should have the same format as when importing a welltrack. Optionally, you can examine the file using the corresponding button. Specify if the model uses TVDSS or MS, also the measurement units.

Lock / Unlock: Locks the selected object. This prevents accidental removing, moving, or displaying data on the object. After clicking unlock all manipulations are possible again.

Remove removes the well from the tree (not from disc).

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Body		2D Seismic