This website summarizes the results from the PETGAS (Petrophysics of Tight Gas Sandstone Reservoirs) project which is a joint industry project (JIP) undertaken by the University of Leeds that is currently in its second phase. Phase I ran between 2008 and 2012 and was sponsored by BG, BP, EBN, GDF, San Leon Energy, Shell and Wintershall. Phase II is running between 2012 and 2015 and is sponsored by BG, BP, EBN, GDF, Shell and Wintershall.

A key aim of PETGAS is to create An Atlas of the Petrophysical Properties of Tight Gas Sands, which will include detailed descriptions of the properties of individual samples (e.g. porosity, gas and brine permeability, Hg-injection characteristics, diagenetic history, mineral composition) as well as individual sections including:

• A detailed description of the analytical methods used and developed during the research project.
• Use of electrical resistivity, NMR, density logging, sonic velocity tools for characterising tight gas sandstone reservoirs (e.g. gas saturation, permeability, stress dependence of permeability etc). Special attention will be given to how a combination of results from these tools can enhance reservoir characterisation.
• Controls on the petrophysical properties of tight gas sands (e.g. diagenesis, grain-size, stress etc).
• Stress dependency of permeability and relative permeability of tight gas sands.
• Implications of results for production strategies in tight gas reservoirs.