Gas Material Balance (P/Z)

Perform gas material balance using P/Z analysis to estimate OGIP, EUR, and recovery factor. The tool supports dry gas reservoirs with Z-factor calculated using the Hall–Yarborough correlation.

‍

How it works

• Paste cumulative gas production and average reservoir pressure
• Calculate Z-factor automatically
• Fit the P/Z straight line interactively
• Read OGIP, EUR, and recovery factor from the plot

‍

Key features

Data input

Paste production and pressure data directly into the workbook.

‍

Z-factor calculation

Computed using the Hall–Yarborough correlation implemented in Excel.

‍

Interactive fitting

Adjust the straight-line fit using sliders.

‍

Output

• OGIP
• EUR
• Recovery factor