Parameters and Spatial Interpolation

Within Danomics parameters are copied from the key well to other wells on a zone-by-zone basis. Additionally, users can also choose to automatically vary those parameters using either "parameter re-mapping" or spatial interpolations driven by grids and spatial tables.

Setting Parameters

Some parameter values experience little to no change between wells and can be directly transferred from a key well to other wells in a project, while other parameters can change substantially and need to be varied well-to-well. This can be done via parameter interpolation from spatial tables or grids or by parameter re-mapping.

This video demonstrates how to set parameters, using the clay volume module as an example.

Users can determine which parameters are spatially varied and which are not. Parameters can be varied well by well using the following options:

• Interpolation from a spatial table. By clicking on the “gear” icon that is visible when hovering over a parameter box you can access the parameters settings and choose to use a spatial table. This dialog is shown below. A spatial table can either be built from scratch (essentially by manually evaluating a limited number of wells or via importing a series of points. This is often done by doing some calculation in the software, exporting to excel, and then re-importing a modified version.
• Interpolation from a grid file. This is also accessed by clicking on the “gear” icon that is visible when hovering over a parameter box. Once again choose “Interpolated table”, but this time select to use an internally generated gridfile (*.grid).

This video demostrates how to perform a spatial interpolation. The process is largely similar using grids or spatial tables.

• Parameter remapping. In the curve normalization module, select the “auto-eval” option for the curves you wish to use for parameter remapping. E.g., “GR auto-eval” will allow parameter re-mapping of the GR_clean and GR_clay endpoints.

Overrides on non-key wells

Changes from key wells are propagated to all non-key wells. However, values propagated outward can be manually overridden on a well-by-well and zone by zone basis.

For example, in the screenshot below a number of parameters have been manually changed. For value boxes these are signified by the text showing as black instead of grey, and for methods the dropdown is no longer listed as “default”.

Tips & Hints

• Do a first pass of your interpretation on the key well without using any parameter re-mapping or spatial interpolation.
• Evaluate which parameters / properties change spatially and use those as the ones to vary first. Then inspect the results and build upon that.
• Decide if properties / parameters needs to vary not only spatially, but zone-by-zone as well.