Oil Material Balance

Brief

The general form of the Oil Material Balance equation was first published by Schilthuis in 1941.

Math & Physics

Production mechanism - gas compressibility only:

$GIIP \times B_{gi}= (GIIP - G_p) B_g$

See also

P/Z plot

Nomenclature

$B_g$ = gas formation volume factor, ft³/scf

$B_{gi}$ = initial gas formation volume factor, ft³/scf

$GIIP$ = gas initially in place, scf

$G_p$ = cumulative gas produced, scf