The Petrophysics bar allows you to execute petrophysical calculations such as shale volume, porosity, saturation, pore pressure, and more using well log data available in the project.
For more information about input formats and methods used in each calculator, refer to the dedicated chapters for each calculation module.
The Bar consists of 2 sections: Views, Execute.
Views section:
Open predefined petrophysics calculation workspace.
The workspace includes the following views by default:
Execute section:
This section includes calculators that operate on well log data. Each button opens a wizard or dialog for the selected operation.
Base properties – Opens the base property calculation wizard. This module allows estimation of hydrostatic pressure, temperature gradient, overburden stress, and effective stress using well depth and fluid parameters. Input parameters include fluid density, gravity constant, and depth range. The resulting curves can be saved as new well logs for further use in pore pressure or stress analysis.
Shale Volume calculation – Opens the shale volume calculation module. Select the method (e.g., linear, Larionov) and input the gamma ray or other relevant logs.
Porosity calculation – Opens the porosity calculation wizard. Supports various methods (density, sonic, neutron, or combined) and requires input of matrix and fluid properties.
Saturation calculation – Opens the saturation wizard. Allows configuration of water saturation methods such as Archie or Simandoux, and includes parameter input for resistivity logs, cementation exponent, and formation water resistivity.
Pore pressure calculation – Opens the pore pressure estimation module. Includes methods like Eaton’s and Bowers’, allowing you to define input logs (e.g., velocity, resistivity) and calibration parameters.
Lithology interpretation – Opens the lithology interpretation tool. This module enables defining lithotypes (e.g., sand, shale, limestone) based on log value ranges and logical rules. Users can set multiple lithotypes, assign weights to log parameters, define matching thresholds, and manage conflicts between overlapping definitions. The result is a lithology log representing the dominant lithotype per depth interval.
Edit LAS curve – Opens the LAS curve editing dialog. Provides options to modify existing well log curves using filters (moving average, median, bandpass), apply depth shifts, or perform mathematical operations with expressions. Includes a history panel for tracking applied modifications and undoing changes.
For more information refer to this topic: LAS editing