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PETGAS

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 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 ran between 2012 and 2015 and was sponsored by BG, BP, EBN, GDF, Shell and Wintershall. Phase III started in January 2017 and is currently 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

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.

Sponsors

PETGAS III is currently sponsored by EBN, Nexen, PDO and Wintershall