libres

libres is part of the ERT project: Ensemble based Reservoir Tool.

Building libres

1. Build libecl

Build and install libecl at the version that .libecl_version specifies. When configuring libecl you should used the option -DCMAKE_INSTALL_PREFIX to tell cmake where to install libecl. The value passed to CMAKE_INSTALL_PREFIX will be needed when running cmake to configure libres in point 4 below. For now let us assume that the prefix /local/ert/install was used.

2. Install Python dependencies

pip install -r requirements.txt 

3. Update environment variables

To ensure that the build system correctly finds the ecl Python package you need to set the environment variables PYTHONPATH and LD_LIBRARY_PATH to include the libecl installation:

bash% export LD_LIBRARY_PATH=/local/ert/install/lib64:$LD_LIBRARY_PATH
bash% export PYTHONPATH=/local/ert/install/lib/python2.7/site-packages:$PYTHONPATH

Observe that path components lib64 and lib/python2.7/site-packages will depend on your Python version and which Linux distribution you are using. The example given here is for RedHat based distributions.

4. Run cmake to configure libres

When running cmake you must tell cmake where the libecl code is located with -DCMAKE_PREFIX_PATH, i.e. in addition to other possible arguments you must at least add:

-DCMAKE_PREFIX_PATH=/local/ert/install

in addition you probably want to pass -DCMAKE_INSTALL_PREFIX to configure where the libres distribuion should be installed, normally that will be the same location where you have already installed libecl.

5. Run make to compile libres

After you have run cmake you should run make and make install to build and install libres:

bash% make
bash% make install

6. postinstall configuration

6.1. The site_config file

As part of the installation process libres will install a file called site-config in $prefix/share/ert/site-config; when ert starts this file will be loaded before the users personal config file. For more extensive use of ert it might be benefical to customize the site-config file to your personal site. There are three possible ways to do this:

1. You can just edit the installed file manually - libres will not install it's version of the site-config file if one is already present.

2. The path to site-config file is compiled into the libres library, if you pass the cmake option -DSITE_CONFIG_FILE=/path/to/site/config when configuring cmake; that way your own personal site-config file is built in.

3. If you set the environment variable ERT_SITE_CONFIG to point to an alternative file that will be used when bootstrapping. This can be a handy way to debug the site-config settings.

For a start you can probably just use the shipped default version of the site-config file.

6.2 Forward models

The libres code contains basic functionality for forward models to run the reservoir simulators Eclipse/flow and the geomodelling program RMS. Exactly how these programs depend on the setup on your site and you must make some modifications to two files installed with libres:

6.2.1. Eclipse/flow configuration

In the Python distribution installed by libres there is a file: res/fm/ecl/ecl_config.yml which is used to configure the eclipse/flow versions are available at the location. You should edit this file to correspond to the conditions at your site; alternatively you can store an alternative configuration file elsewhere and set the environment variable ECL_SITE_CONFIG to point to the alternative file.

6.2.2. RMS configuration

In the Python distribution installed by libres there is a file: res/fm/rms/rms_config.yml which contains some site specific RMS configuration. You should update this file with your local path to the rms wrapper script supplied by Roxar; alternatively you can store an alternative configuration file elseswhere and set the environment variable RMS_SITE_CONFIG to point to the alternative file.