TOC Analysis Module
Purpose
The TOC Analysis modules provides several methods for estimating the total organic carbon (TOC) content of a system and convert it to a volume of kerogen.
Primary Outputs
The following curves are the primary interpretations made in this module.
| Curve Name | Description |
|---|---|
| TOC_FINAL | Final TOC result using method selected for zone |
| V_KER | Volume of kerogen derived from the TOC_FINAL curve |
Discussion
Users can make interpretation via several different methods. In general parameters can be set via drag and drop on log tracks or by typing parameters into the CPI Params tab. Most parameters and methods can be set on a zone-by-zone basis.
Several other curves are calculated en route to the primary outputs listed above. The table below lists some of the key results that you may want to compare among themselves.
| Curve Name | Description |
|---|---|
| TOC_SCHMOKER | TOC result from Schmoker method |
| TOC_SLOGR | TOC result from Passey sonic method |
| TOC_DLOGR | TOC result from Passey density method |
| TOC_NLOGR | TOC result from Passey neutron method |
| TOC_VERNIK | TOC result from Vernik method |
| TOC_FAUST | TOC result from Faust method |
| TOC_MOD_PASSEY | TOC result from Modified Passey method |
| TOC_COMBINED | TOC result from average of twelve empirical Schmoker-like methods |
In general when performing the interpretation it is best to identify the key properties in an inorganic shale interval and use those properties to set the key parameters for the methods of interest.
It is often useful to set the parameters for each of the methods to try and minimize the variance among methods. This will make it easier to change methods between wells if the data requires it.
The “Schlumberger method” for TOC to kerogen conversion has been reported to show good results from several clients.
An additional video for TOC interpretation can be found here.
Related Insights
2026 User Group Meeting
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Quick Start Module
Purpose The Quick Start module is designed to help users quickly set dozens of common parameters by selecting a handful of basic options from dropdown menus. Parameters There are three parameters that are set on a zone-by-zone basis and two parameters that are set on a full-well basis. These are as follows. Discussion The parameters are linked to what are called named_defaults in the software. These are collections of defaults that can be set through assigning a single parameter.
Making Log Calculations in a Flow
This articles provides an overview of how to use a Flow to before basic log calculations. To do this, the following Flow tools are used: LogInput >> Bring the log data into the Flow LogMath >> Perform some calculation LogOutput >> Writes the log data to a new log database. There can be as many LogMath tools added to a flow as one would like, and they can be added to existing Flows ushc as a Log Clean-up Flow. The LogMath tool is extremely flexible.