Sw Interpretations Module
Purpose
The Sw Interpretations module provides several methods for calculating the water saturation and permeability for reservoir intervals.
Primary Outputs
The following curves are the primary interpretations made in this module.
| Curve Name | Description |
|---|---|
| SW | Water saturation |
| PERM_FINAL | Permeability |
Discussion
Water saturation can be calculated by several different methods. The method and the associated parameters can all be set on a zone-by-zone basis as needed. Parameters, such as the Rw should be set at the surface temperature - Danomics handles the conversion to formation temperature for you.
When setting the cementation and saturation exponents, remember to evaluate the built in Pickett plot
For methods requiring a clay resistivity (e.g., Simandoux), the Rt-Clay crossplots will also be useful.
In Danomics we let you explicity choose to perform the Sw calculations using either an effective or total porosity. If you select an effective porosity method, then Sw = SwE, whereas with a total porosity method Sw = SwT. Later, when these ar used in the volumetrics we enforce consistency. For clarity, the following curves are available:
| Curve Name | Description |
|---|---|
| SWT | Total saturation |
| SWE | Effective saturation |
| BVWT | Bulk volume water total |
| BVWE | Bulk volume water effective |
For QC'ing your interpretation the following maps are useful:
| Map Name | Description |
|---|---|
| AVG_SW | Average water saturation for the selected zone |
| SW_NET_RES | Average water saturation for the selected zone in intervals flagged as net reservoir |
| SW_NET_PAY | Average water saturation for the selected zone in intervals flagged as net pay |
In general the user should:
- Set all parameters for the water saturation calculation before performing the permeability calculation as many permeability methods use water saturation as an input.
- Remember that if you select a “PhiE” method for the water saturation calculation, Sw = Swe. Similarly, if you select a “PhiT” method for the water saturation calculation, Sw = SwT.
Here is another useful tutorial video.
Related Insights
2026 User Group Meeting
Please join us at the 2025 Danomics User Group Meeting. Danomics will be holding its annual user group meeting on October 15th, 2026. To join us, please RSVP to sales@danomics.com. PDF version available here: 2026 User Group Agenda. In-Person User Training We'll also be offering in person user training on October 13th and 14th. You can register by emailing us at sales@danomics.com. Both days have the same agenda, so you should only register for one of the sessions.
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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.
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