In Danomics Petrophysics Insights users are guided through a workflow that walks them through a number of modules. These modules are located via a dropdown menu at the top center of the window. The modules are listed in the order in which a user should ideally proceed through a project. However, this order is not strictly enforced and the user can start at any module and can seamlessly move both forward and back through the modules. This help article will focus on the Setup module.
The Project Setup Module
To get to the Setup module, use the module selector dropdown located at the top of the page and choose the option “Setup”. If you have a well active, you will see a screen like the one above.
There are three primary choices you will be presented with. These are:
- Curve calculation range
- Stats window range
- Curve compositing
Curve Calculation Range
The curve calculation range is determined by the “Curve calculation start” and “Curve calculation end” parameters. This range determines the interval over which curves are displayed, and is largely for aesthetic purposes as it does not impact the calculations, only what is shown.
Stats Window Range
The stats window range is the determined by the “Stats window start” and “Stats window end” parameters. This range determines the interval over which curve data statistics are generated, and the range selected will affect the way parameter remapping and curve normalization are done. For the stats window range it is important to have a thick enough interval that you capture a relevant statistical distribution of the data. For example, if you only focus on an interval that has one lithology, your statistics window may not be representative of your curve data. Likewise, if your formations of interest comprise compacted sediments, then you will likely want to exclude shallow overburden as this is likely to result in statistics that are not representative of your target intervals.
In general, it is recommended to use a window around your formation tops, and to make sure it is at least 500′ in total thickness.
For both, the user will have the option of choosing a range over the entire data interval, a specified depth interval of fixed values, and relative to the formation tops in the well. Note that when using relative to formation tops, to go above the formation top values should be negative (i.e., -100 is 100′ above), while to go below the top values should be positive (i.e., 100 is 100′ below).
There are built-in curve name alias tables in Danomics that are present to ensure that curves of the same type are displayed regardless of the mnemonic. However, in some wells there may be two curves of the same name, which poses a challenge in selecting which one to display.
With curve compositing turned off, the software will only display the first curve that is shown in the alias table. With curve compositing turned on it will show the first non-null value present from a curve in the alias table. Below is an example of the calculation when there are two GR curves (GR and GR2, which are present in the alias table in that order).
|Depth||GR||GR2||Composite Off||Composite On|
Notice that if compositing is turned off, the value from GR will always be displayed, while if compositing is turned on, at depth steps where GR2 has data and GR does not, the data from GR2 will be used. This is why Danomics generally recommends that compositing be used.