Clay Volume Module
Purpose
The Clay Volume module allows users to calculate the volume of clay using both single clay (GR, SP, Nphi) and dual clay (Neutron-Density, Sonic-Density, and Neutron-Sonic) indicators.
Primary Outputs
The following curves are the primary interpretations made in this module:
| Curve | Description |
|---|---|
| vwcl | Volume of wet clay |
| vshale | Volume of shale |
Discussion
Users can make interpretation of clay volume via several different methods and can set parameters using crossplots and log tracks. It is important to note that by default only vclay from gamma ray and neutron-density methods are enabled. To utilize other methods users should enable them and then set the necessary parameters.
It is generally recommended to establish a vclay using the neutron-density or similar methodology first and then adjust the endpoints in other methods to obtain a good match.
When more than one clay volume method is active the user will have the choice to either take the minimum value of each of the methods or the average value of all of the methods.
QC of results can be performed using both cross-sections and maps. The cross-section template is named "Clay Volume" and the most relevant maps are:
| Grid | Description |
|---|---|
| avg_vwcl | Average vclay for the zone |
| vwcl_net_res | Average vclay for intervals flagged as net reservoir in the zone |
| vwcl_net_pay | Average vclay for intervals flagged as net pay in the zone |
An additional video for vclay interpretation can be found here.
Related Insights
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.
Sample data to get started
Need some sample data to get started? The files below are from data made public by the Wyoming Oil and Gas Commission. These will allow you to get started with petrophysics, mapping, and decline curve analysis. Well header data Formation tops data Deviation survey data Well log data (las files) Production data (csv) or (excel) Wyoming counties shapefile and projection Wyoming townships shapefile and projection Haven’t found the help guide that you are looking for?