Formations pressures......help

[bayan]

could you please to advise me how to estimate pressure for every formation in drilling program.

Thank you in advnce

Regards

[i-anuar]

overpressure
- from nearby analogues
- drilling D(?) curves
- if long HC columns expected
- in thick salt zones overpressured zones may exist. Salt may be better pressure seal (not temperature) and zones below may be overpressured (e.g. Kash-all-gone :-))
- ...

Underpressure
- if zone was depleted by production
- if drilling through aquifer that is attached to producing field and may be also depleted

[i-anuar]

overpressure
- from nearby analogues
- drilling D(?) curves
- if long HC columns expected
- in thick salt zones overpressured zones may exist. Salt may be better pressure seal (not temperature) and zones below may be overpressured (e.g. Kash-all-gone :-))
- ...

Underpressure
- if zone was depleted by production
- if drilling through aquifer that is attached to producing field and may be also depleted

[bayan]

Thank you i-anuar so much for your explaination.Actually there is nearby analogues (MDT pressure measurment for reservoir formation only) my point here:
Can we use this pressure for the same formation?
What about the formations above the reservoir formation can use water gradient to estimate pressure in the above formation?
Your reply and comments will be highly apprecaited
Regards