The CPI Config

The CPI Config is what houses all the equations, parameters, methods, well log tracks, and modules that are shipped with Danomics Petrophysics. The CPI Config can be modified so that you can add new equations, parameters or even entire modules to your workspace. This is the easiest way to integrate proprietary or non-standard methods into your workflow.

CPI Config Structure

The CPI configuration is split into a number of files, each associated with a module or some other base functionality. You can reach the CPI Config by clicking on your head icon located in the upper right-hand corner of the window and selecting “CPI Config” from the menu.

This will open up a window that has two panels:

1. Overrides: This panel is where you will add your modifications
2. Config: This is what houses all of the built in equations.

Inside the config you will see several subsections as outlined below.

Parameters

Parameters are the building blocks of the CPI Config. They are, of course, used in the equations, but are also what form the basis of what is displayed in the parameter tables (that are called in the modules later on).

The parameter section in each module is designated by a line the reads: param:

Equations

Equations are what perform all of th calculations. These can utilize functions, operators and call parameters. The equation section in each module is designated by a line the reads: equation:

Named Defaults

Named Defaults allow you to use “presets” such as the Lithology Preset in the Clay Volume and Porosity Modules. Named Defaults can contain as many or few parameters as the user desires. Below is the actual example of the sandstone and limestone presets. These sections are denoted by the line: namedDefaults:


Exports

The exports sections sets what log curves and what petrophysical properties are exported by default, as well as what maps are generated by default. The start of the export section (found in root.yaml) is denoted by the line: export:

The defaultExportCurve is to set the curves that are written during an LAS export without the need for additional selection. The formationSummaryCurve determines what properties are mapped and what properties are exported as part of the CPI export.

Curve Aliases

The curve aliases section is to designate curve alias names. The section is denoted as starting with the line aliasedCurve: and can be found in the file aliases.yaml.

For aliases it best practice to copy all of the mnemonics associated with an alias, paste it into your overrides, and then extend it as needed.

Syntax, Operators & Functions

Within the CPI Config best practice dictates that we differentiate between curve names and parameter names. Curve names are designated with the “@” symbol; for example, “@gr” means that you are using the Gamma Ray curve. Parameter names are designated with the “$” symbol; for example the “$gr_clean” and “$gr_clay” are for the GR Clean and GR Clay parameters for the Vclay from Gamma Ray methodology.

The following mathematical operators are available:

In addition to the mathematical operators and logicals listed above, Danomics has a series of functions available for use, as outlined in the table below.

Hints & Tips

• Spacing matters. You need to properly align your keys and keywords.
• The structure follows YAML standards.
• You have access to the default CPI Config when you subscribe to Danomics. Use it as a guide for extending the parameters, equations, and plots.
• If you get hopelessly lost, just email us at support@danomics.com
• Most error messages you get will likely be due to typos, minor syntax errors, or spacing – just carefully re-read your code in your editor to find out what went wrong.
• Make sure to test our code – if you make a new plot, inspect it closely to make sure that everything is showing up as planned. Test your equations for commonsense. Make sure that results are moving in the direction you expect when you change parameters.