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In practical exercises with manual or spreadsheet-assisted calculations the time step is usually a month , rarely quarter or a year – to ensure the formation pressure did not change much since the previous time step.
Moving to annual time step may accumulate a substantial mistake if formation pressure has varied substantially in some years.
The benefit of VEH approach is that net pay formation pressure history
is usually known and the aquifer drive model parameters
can be calibrated iteratively by using
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Material Balance calculations.
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