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This computational scheme is called superposition in time domain.

In practical exercises with manual calculations the time step is usually months, rarely yearsa month, rarely quarter or a year – to ensure the formation pressure did not change much since the previous time step.  


The benefit of VEH approach is that net pay formation pressure history 

LaTeX Math Inline
bodyp(t)
is usually known and the aquifer drive model parameters 
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body\{ B, \, r_a \}
can be calibrated iteratively by using 
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anchorVEHD
 in Material Balance calculations.

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