Field scale model generation and upscaling toolkit

• The StrataTrapper codes
• Structure
• Running
• Versions
• Contributing
• References

The StrataTrapper codes

This is the StrataTrapper upscaling toolkit. It can also generate heterogeneous fine-scale models with specific correlation lengths to re-upscale given coarse-scale two-phase flow models.

Another tool is the reduced-physics model CO2GraVISim.

Structure

Top-level scripts and functions are in the repository root, and the rest is in src/ folder.

demo.m script is an implementation of the running guideline below.
Feel free to play with it and use as an example for your own scripts.

Running

1. Run startup.m to setup MATLAB Path.
   1. Optional: start a parallel pool to run computations there.
2. Read or generate target coarse grid dimensions and input fine-scale porosity and permeability for each coarse block.
3. Setup input rock-fluid properties and algorithm options represented by Params and Options classes.
4. Create logical mask to filter out impermeable cells and/or define an arbitrary subset of cells to process.
5. Run strata_trapper function with arbitrary number of parallel workers optionally enabling a UI progress bar.
6. Visualise outputs with plot_result function
7. Export the outputs to PFLOTRAN-OGS-compatible text files using ogs_export function.

Tips:

• Usually, MATLAB runs startup.m scripts automatically if they are in a startup folder.
• The heaviest part of the algorithm is essentially parallel with no synchronisation.
  So, using several parallel workers usually results in a proportional performance boost.

Versions

The original version of the toolkit is v0.1.0.
It has its own structure and some unique functionality,
so it may worth attention as much as later versions.

CHANGELOG.md describes the version history and key changes.

Other versions can be accessed via tags and releases sections of the repository.

Contributing

Everyone is welcome to open issues and pull requests.

References

The StrataTrapper algorithm as well as motivation and theory behind it are in the paper:

Samuel J. Jackson, Samuel Krevor
Small-Scale Capillary Heterogeneity Linked to Rapid Plume Migration During CO2 Storage
Geophysical Research Letters | 2020
https://doi.org/10.1029/2020GL088616