TWC equations

Models for Sandstones

When you select Sandstone as the rock type, the models that apply to sandstones are available as listed in the Equation Type drop-down list on the Rock Dep. Properties form. The equation for each model is described in detail below.

Khasar et al 2009 (TWC-UCS-1): Global model for UCS > 2500 psi

Rahman et al 2010 (TWC-UCS-2): Tertiary rocks, weak / intermediate SE Asia

Tronvoll et al 1997 (TWC-UCS-3): Weak Rocks (UCS < 400 psi)

Gui et al 2016 (TWC-UCS-4): Weak Intermediate (UCS 1500-5000 psi) Offshore SE Asia

TWC-UCS-5 : Weak Intermediate (UCS < 5000 psi) Deep water west Africa

TWC-UCS-6: Strong rocks (UCS > 7000 psi) Offshore Australia

Khaksar et al 2009 (TWC-Porosity-1): Deep water Australia (porosity 0.15-0.29)

Asadi et al 2016 (TWC-Porosity-2): Offshore Malaysia (porosity 0.21-0.28)

Khaksar et al 2014 (TWC-Porosity-3): Offshore Malaysia (porosity 0.16-0.30)

TWC-Porosity-4: Deep water SE Africa (porosity 0.16-0.28)

TWC-Porosity-5: Offshore Malaysia (porosity 0.25-0.29)

TWC-Porosity-6: Onshore Australia (Porosity 0.04-0.22)

TWC-Porosity-7: Deep water Malaysia, Gulf of Mexico

Rahman et al. 2008 (TWC-M): TWC 2000 – 6000 psi tertiary gas field, S Asia.

TWC-M-2: TWC 7000 – 25000 psi Offshore NW Australia

TWC-DTc-1: TWC 3000 – 15000 psi Offshore SE Australia

TWC-DTc-2: TWC 5000 – 8000 psi Deepwater W Africa

Rahman et at. 2010 (TWC-DTs): TWC 3000 – 5000 psi Offshore NW Australia

Models for carbonates

Asadi et at. (TWC-Porosity-1): Offshore Vietnam (porosity: 0.15-0.35)

TWC-Porosity-2: Global model wide porosity range

TWC-UCS: (Porosity 0.25-0.30) Offshore NE Africa