Reservoir Material Balance & Havlena-Odeh Drive Indices Calculator

Determine original oil in place ($N$), net underground withdrawal ($F$), and primary reservoir energy drive mechanisms (DDI, SDI, WDI, and EDI).

Cumulative Oil N_p (MMstb):

Gas-to-Oil Ratio R_p (scf/stb):

Current Oil FVF B_o (rb/stb):

Initial Oil FVF B_oi (rb/stb):

Initial Solution GOR R_si (scf/stb):

Current Gas FVF B_g (rb/scf):

Gas Cap Ratio (m): Initial gas cap vol / oil zone vol

Cumulative Water Influx W_e (MMbbl):

Original Oil in Place (OOIP N)

Underground Withdrawal (F)

Depletion Drive DDI

Gas Cap Drive SDI

Water Drive WDI

Havlena-Odeh Linear Relationship

F = N · (E_o + m · E_g) + W_e | Total Energy Balance = 100%

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