Data and data availability
In the PERFORM project, we collected data about geology, reservoir properties, the chemical composition of the brines, particles and precipitated minerals. Data from approx. 26 sites and another 40 wells have been collected.
Data quality and amount of data
Depending on the specific data source for each entity in the database, the amount of data and the data quality varies considerably. Detailed information is available from a number of key geothermal sites identified initially in the project – while for other geothermal wells, only limited data were available in the literature. The key sites are listed below.
The data collection was based on more sources:
- Data from key geothermal sites.
- Additional data from Dutch sites obtained from an in-house TNO database with the permission of operators as well as new data from Dutch reservoirs.
- Data collected from a parallel geothermal research project in Denmark (the GEOTHERM project).
- Data collected from the literature.
Key geothermal sites and data for a common database
Initially, eight key geothermal sites located across Europe were identified. As part of the project application phase the operators of these sites had agreed to share data in the common knowledge database. The geothermal key sites are:
- Thisted, Denmark
- Margretheholm, Denmark
- Sønderborg, Denmark
- Groß Schönebeck, Germany
- Honselersdijk, Netherlands
- Pijnacker Nootdorp, Netherlands
- Schlattingen, Switzerland
- Oberlaa, Austria (no data supplied)
Questionnaire for data collection
Data were collected using a targeted questionnaire. The questionnaire was designed to obtain as much information as possible about basic data, important geological aspects, reservoir parameters, key geochemical data, surface facilities, well design, operational performance and potential injectivity problems.
The collected data form the basis of designing the PERFORM database. A few datasets are to be kept confidential, but a large proportion of the data in public domain is available at the website.
Data available from the PERFORM Website
The website includes several data files extracted from the PERFORM database and among other, the data material comprises the following data types suitable for evaluating plant performance:
- Overview of plants and wellbores.
- Brine analyses i.e. chemical analyses of the composition of geothermal water. Both the formation and the injection waters are considered. An example of brine analysis data (mg/l) is presented below (from the Margretheholm site, DK):
- Brine particle analyses i.e. chemical analyses of the composition of particles observed in the production and injection waters. An example of brine particle analyses data (weight-percent) is presented below (from the Gross Schönebeck site, DE):
- Mineralogical composition of the reservoir rock. Includes information about the amount rock-forming minerals present in the reservoir section i.e. the percentage of quartz, feldspar, calcite etc.
The source of the majority of data in this collection are reports, publication etc. This database does not describe the sampling methods in detail. Differences in sampling method can affect the result of the chemical analysis especially for elements with low concentration. Before you draw conclusions from the data, you must consult the literature specified.
Data in the PERFORM project are stored in a PostgreSQL database. To make the data more accessible most of the data are extracted as the excel files shown below.
brine particle analyses (xlsx)
PostgreSQL is open source and can be downloaded from https://www.postgresql.org
If you are going to use the postgresql backup file you will need some knowlegde about relational databases and SQL.
The compressed file with the backup also contains an ER-diagram and a data dictionary.