OPM data
File type: Various data file
Files with unrst file extension contain unified restart data produced by OPM reservoir-simulation software.
An unrst file is a binary simulation-output file, not a document intended for direct reading.
File type category:
Various data file
Date updated: October 11, 2026
The unrst file extension is used by the Open Porous Media (OPM) project, which develops open-source software for simulating flow and transport in porous media, including subsurface reservoirs.
OPM Flow writes the unrst file as a unified restart file. It contains simulation state data for one or more report steps, allowing a simulation to be restarted or its results to be examined by compatible OPM tools.
The file belongs to a group of OPM simulation input and output files and is normally created alongside other files from the same run. OPM is available for Microsoft Windows.
Open the unrst file with the OPM simulator or a compatible OPM post-processing utility. It is normally read as part of an OPM simulation workflow rather than opened as a standalone document.
A text editor or general-purpose media application will not display the simulation data meaningfully. On Microsoft Windows, use the appropriate OPM components and their command-line or post-processing functions to read the file.
The unrst file is a simulator restart file and is normally kept with the other files from its OPM run.
To obtain data in another representation, use OPM's supported output or post-processing workflow to read the required report steps and export the selected results to a format supported by that workflow.
Software applications that handle other tasks involving unrst files:
Microsoft Windows
Language
