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→Material balance estimation for oil
* <math>\text{Change in pore volume} = \frac{NB_{oi}}{(1 - S_{wi})}c_fP</math>
* <math>\text{Change in pore volume} = \frac{NB_{oi}}{(1 - S_{wi})}c_fP</math>
* <math>\text{Change in oil volume} = NB_{oi} - (N - N_p)B_{oi)</math>
* <math>\text{Change in oil volume} = NB_{oi} - (N - N_p)B_{oi}</math>
* Change in gas volume = (''GB''<sub>gi</sub> – ''GB''<sub>g</sub>) + [''N''<sub>p</sub>''R''<sub>p</sub> ''(N'' – ''N''<sub>p</sub>) – NR<sub>si</sub>]''B''<sub>g</sub> due to gas produced, evolved, and encroached from a gas cap
* Change in gas volume = (''GB''<sub>gi</sub> – ''GB''<sub>g</sub>) + [''N''<sub>p</sub>''R''<sub>p</sub> ''(N'' – ''N''<sub>p</sub>) – NR<sub>si</sub>]''B''<sub>g</sub> due to gas produced, evolved, and encroached from a gas cap
* Change in water volume = –''NB''<sub>oi</sub>''S''<sub>wi</sub>/(1 – S<sub>wi</sub>)''c''<sub>w</sub>''P'' – ''W''<sub>e</sub> + ''W''<sub>p</sub>''B''<sub>w</sub>, due to connate water volume change, encroached water, and produced water
* Change in water volume = –''NB''<sub>oi</sub>''S''<sub>wi</sub>/(1 – S<sub>wi</sub>)''c''<sub>w</sub>''P'' – ''W''<sub>e</sub> + ''W''<sub>p</sub>''B''<sub>w</sub>, due to connate water volume change, encroached water, and produced water