ResInsight/docs/WellLogsAndPlots.md

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ResInsight can display well logs from imported LAS-files and by extracting data from a simulation model along a well trajectory. Extracted simulation data can be exported to LAS-files for further processing.

Importing LAS-files

LAS-files can be imported using the command: File->Import->Import Well Logs from File.

ResInsight will search for the the well name in the imported LAS-files among your existing Well Trajectories. If a match is found, the LAS-file is placed as a child of that trajectory. If not, a new empty trajectory entry is created with the imported LAS-file under it.


If the LAS-file does not contain a well name, the file name is used instead.

Plots, Tracks and Curves

Creating Well Log Plots

Well log plots can be created in several ways:

1. Right click the empty area below all the items in the Project Tree and select New Well Log Plot. A plot is created with one Track and an empty Curve.
2. Right click a wellpath, either in the Project Tree or in the 3D-view, and select either New Well Log Extraction Curve. A new plot with a single Track and a Curve is created. The curve is setup to match your selection (Well trajectory, active case and result)
3. Right click a LAS-file channel in the Project Tree and select Add to New Plot. A new plot with a single Track and a Curve is created. The curve is setup to plot the selected LAS-file channel.

Each Well Log Plot can contain several Tracks, and each Track can contain several Curves.


Tracks and Curves can be organized using drag and drop functionality in the Project Tree. Tracks can be moved from one plot to another, and you can alter the order in which they appear in the Plot. Curves can be moved from one Track to another.

Plots

All the Tracks in the same plot always display the same depth range, and share the True Veritcal Depth (TVD) or Measured Depth (MD) setting. In the property panel of the plot, the exact depth range can be adjusted along with the depth type setting (TVD/MD).

Depth zoom and pan

The visible depth range can be panned using the mouse wheel while the mouse pointer hovers over the plot. Pressing and holding Ctrl while using the mouse wheel will allow you to zoom in or out depth-wise, towards the mouse position.

Track

Tracks can be created by right clicking a Well Log Plot and select New Track

A track controls the x-axis range of the display, and can be edited from the property panel of the Track.


Curves

Curves can be created by right clicking a Track in the Project Tree, or by the commands mentioned above. There are two types of curves: Well Log Extraction Curves and Well Log LAS Curves.

Well Log Extraction Curves

Ectraction curves acts as an artifical well log curve. Instead of probing the real well, a simulation model is probed instead.

They are calculated by intersecting a well trajectory with the cells in a particular grid model. At each intersection point the measured depth along the trajectory is deduced and the corresponding result value is read.

The property panel for a geomechanical model is shown below:


The first group of options controls all the input needed to setup the data extraction for the curve - Well Path, Case, and result value. The selection of result value is somewhat different between geomechanical cases and Eclipse cases. In addition you can select what timestep to address if the selected property is a dynamic one.

Placing keyboard focus in the Time Step drop-downbox will allow you to use the arrow keys to quickly step through the timesteps while watching the changes in the curve.

The disply name of a curve is normally generated automatically. The options grouped below Auto Name can be used to tailor the length and content of the curve name.

Well Log LAS Curves

LAS-curves shows the values in a particular channel in a LAS-file.

You can also create a LAS-curve by a simple drag-drop operation in the Project Tree: Drag one of the LAS channels and drop it onto a Track. A new curve will be created with the correct setting.

The property panel of a LAS-curve is shown below:


Exporting LAS-files

A well log curve can be exported to a separate LAS file by right clicking the curve, and select Export To LAS-File .... The proposed file name is the same as the curve name, but adjusted to be file name compatible. The name of the well trajectory used to create the curve (Extraction Curve) is written into the WELL section of the LAS file.