Extract seismic trace

Extract seismic trace writes the seismic trace nearest to a well into a new LAS curve on that well, resampled along the wellbore at a step you choose. The result is an ordinary log curve, so the seismic amplitudes can be displayed and compared with the other logs of the well. The same settings can also be stored as a task in a project workflow and re-run later.

Requirements

A well with a trajectory in the Wells folder of the Data Manager.
Seismic data lying within the Nearest seis distance search radius of the well head, set in the Module properties. Only the geometries and seismic data found inside that radius are offered, and the dialog does not open when nothing is found - increase the value when the nearest seismic lies further away.
Checkshots on the well when the selected seismic is in the time domain, so that seismic times can be converted to depth along the well.

Extracting a trace

In the Data Manager, right-click a well under Wells and choose Extract seismic trace.
Set the parameters described below.
Press Run to extract the trace now, or Save to workflow to keep the settings as a workflow task instead.

Parameters

Geometry - the seismic geometry the trace is taken from. The list holds the geometries found near the well, each entry showing its distance from the well.
Seismic - the seismic data set to sample. The offered list follows the selected geometry.
Step MD (shown with the current depth unit) - the sampling interval of the resulting curve along measured depth.
Output curve - the name of the curve written to the well. The default name is Seismic_curve; the name cannot be empty.

Buttons and workflow support

Save to workflow - stores the selected well together with Geometry, Seismic, Step MD and Output curve as an Extract seismic trace task in the current workflow. Nothing is extracted at this point - the trace is produced when the workflow runs. The dialog stays open and keeps the entered values, so several tasks can be saved in turn.
Run - extracts the trace immediately with the current settings and keeps the dialog open, so the settings can be adjusted and the extraction repeated. If the well already holds a curve with the output name, you are asked whether to overwrite it.
Close - closes the dialog.

If the project contains no workflow yet, Save to workflow asks for a name and creates one. Reopening the task from the workflow restores the dialog with its saved settings so they can be reviewed and edited; Save writes the changes back to the task and Cancel closes the dialog. When the workflow runs, the trace is extracted with the stored settings, and an existing curve with the same name is replaced without a prompt.

The task refers to the geometry and the seismic data by name. If the saved geometry is no longer present in the project, the task reports it as unavailable and no curve is produced. See Workflows for how workflows are built, ordered and executed.

Result

The extracted trace is added to the well as a LAS curve named after Output curve and appears under that well in the Data Manager. It behaves like any other LAS curve on the well - see Wells for how log curves are displayed. If none of the well depths map onto the selected seismic - for example when the checkshots do not overlap the seismic, or Step MD is too large - the extraction reports this and no curve is created.