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
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?
NMR Interpretation Module
Purpose The NMR interpretation module allows users to calculate porosity, bound and free fluids from the measure T1 and T2 distributions from NMR tools. Primary Outputs Discussion In oil and gas well logging, the $T_2$ distribution is used as a high-resolution "map" of the formation's pore system. While a standard porosity tool tells you how much fluid is there, NMR tells you where that fluid is trapped and whether it will flow.
General Concepts in Flows
Because Flows will be a new concept to many of you it is important to understand the general concepts that flows are built upon. These concepts are: Many tasks are repetitive These tasks should be done consistently These tasks can often be split into small pieces. What Are Flows? Flows are batch processing system that combine Flow tools to perform operations consistently across a dataset, and are especially useful for repetitive tasks like gridding data.