Import well logs


Module overview

What will you learn in this module?

In this module you will learn how to import well log data from .las files into Helios.

What input data will be required in this module?
  • Well log data in .las format
What output will you have created in this module?
  • Well log file in .dil format
Demo dataset that may be used to apply the learnings from this module:

Video tutorial

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Instructions and screenshots

Well logs can be imported from the top menu of the main interface: Project > Import > Well Logs

After clicking Load well a dialog opens and the user should choose the .las file to be imported

Once a file has been selected the import dialog will open. The header lines, NaN value and Log Interval should be set automatically.

The Preview button allows to display the .las file to be read.

Next, the user needs to assign the columns in which the respective logs are stored in the .las file including the corresponding Units.

During import all curves will be converted to SI units. When pressing the import button, the user will be asked to specify the filename. The filename must end with .dil which is the internal Helios format for well log data.

During import all data gaps and specified NaN values within the log interval will be replaced by linear interpolation. If NaNs occur at the beginning or end of the logs, the samples will be replaced by the first/last value that contains a real value. As part of the import procedure, compressibility and shear compliance (plus several other elastic properties) will be computed based on the specified P-velocity, S-velocity and Density curves. A sonic based TD relationship will be computed based on the loaded unfiltered P-velocity. The TWT of the first log sample will be computed assuming a homogeneous overburden with the velocity of the first sample. The user can change the t0 later.