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→Material balance estimation for oil
* <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>
* <math>\text{Change in gas volume} = (GB_{gi} - GB_g) + [N_p R_p (N - N_p) - NR_{si}] B_g</math> due to gas produced, evolved, and encroached from a gas cap
* <math>\text{Change in gas volume} = (GB_{gi} - GB_g) + [N_p R_p (N - N_p) - NR_{si}] B_g</math> 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
* <math>\text{Change in water volume} = \frac{-NB_{oi}S_{wi}}{(1 - S_{wi})}c_wP - W_e + W_pB_w</math>, due to connate water volume change, encroached water, and produced water
where
where