A method to estimate an equivalent reservoir pressure in a given reservoir location $\begin{array}{l}(x, \, y, \, z)\end{array}$ as if this location was translated vertically to the Datum.

It allows compensating the pressure difference between various reservoir locations related to the differences in their elevation.

If reservoir structure is flat then initial Reservoir Pressure at formation top is going to be constant across the field and so will be the Datum Pressure but with a constant shift accounting for the height between formation top and Datum.

If reservoir structure is non-flat then initial Reservoir Pressure at formation top will be varying across the field while the Datum Pressure will be constant across the field.

This particularly helpful in Reservoir Pressure analysis during production so that areal Reservoir Pressure distribution recalculated to Datum shows only those pressure variations across the field which are related to production and not to the field structure.

The usual practise is to measure/assess reservoir pressure at formation tops and then recalculate it to Datum using Datum Pressure @model.

If done systematically it provides a fair basement of analysis of field-areal reservoir pressure dynamics over time with account of formation tops elevation.

The mathematical model of Datum Pressure is explained in Datum Pressure @model.

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