Basin-Wide EOS Models for Liquid-Rich Shale

The resulting EOS model(s) will provide a means to generate key PVT data for individual wells based on readily-available data such as reservoir temperature, separator gas composition (gravity), crude API gravity, and producing gas-oil ratio. The EOS model(s) can also be used for advanced PVT applications such as black-oil PVT tables needed for reserve calculations, numerical simulation of well performance, and lumped-EOS models that can be used in compositional reservoir simulation of gas-based EOR processes. The technology of developing a single, common EOS model for multiple reservoirs and basins has been developed and used by whitson, formerly known as PERA, for the past 30 years around the world. This is achieved by including a wide range of fluid samples with measured PVT data (low-GOR to high-GOR) from a basin, multiple reservoirs and groups of formations.

Approach & Methodology
A typical project involves the following key items:

  • Quality check (QC) PVT laboratory reports
  • C7+ characterization
  • EOS Tuning to match laboratory experiments
  • Thermodynamic Consistency Check of EOS


  • EOS model in requested format (E300, GEM, SENSOR, HYSYS or other)
  • All digital files and results related to this work (e.g. QC)
  • Final detailed report containing key findings, results and recommendations
  • Final presentation


  • Eagle Ford
  • Bakken
  • Montney
  • SCOOP/STACK/Merge (ongoing)
  • Delaware (ongoing)
  • Midland (ongoing)
  • Duvernay (ongoing)