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Petrophysics of Tight Gas Sandstone Reservoirs

Welcome to PETGAS

This website summarizes the results from the PETGAS (Petrophysics of Tight Gas Sandstone Reservoirs) project, which has been a long-running joint industry project (JIP) conducted by the University of Leeds.

The project has now completed three phases:-

  • Phase I ran between 2008 and 2012 and was sponsored by BG, BP, EBN, GDF, San Leon Energy, Shell and Wintershall.
  • Phase II ran between 2012 and 2015 and was sponsored by BG, BP, EBN, GDF, Shell and Wintershall.
  • Phase III ran between 2015 and 2017 and was sponsored by EBN, Nexen, PDO and Wintershall.

PETGAS has created An Atlas of the Petrophysical Properties of Tight Gas Sands, which includes detailed descriptions of the properties of individual samples (e.g. porosity, gas and brine permeability, Hg-injection characteristics, diagenetic history, mineral composition). All data is available through this searchable website and has also been loaded into our be-spoke data visualization software PETMiner.

The PETGAS database has been integrated with wire-line log data to address key issues such as:-

  • Identification of the key controls on the petrophysical properties of tight gas sandstones
  • Rapid estimation of petrophysical properties based on microstructural information obtained from core or cuttings
  • The stress dependency of petrophysical properties
  • Impact of heterogeneity on petrophysical properties
  • Best practise for core analysis of tight gas sandstones


PETGAS is transitioning to PETZERO and is open to new sponsors

The results from the project are already making impact with sponsors. For example, we have successfully predicted flow rates in tight gas sandstones by integrating cuttings analysis and wireline log data within 12 hours of receiving the data.

The next phase of PETGAS is being rebranded as PETZERO. While it will still accept sponsors interested in the petrophysics of tight gas sandstones, it will be particularly focussed on petrophysics and core analysis relevant to the energy transition such as geothermal energy and CO2 storage.

Contact Prof. Quentin Fisher ( for further information.