What is the nature of fields typically explored and developed so far?

Typically, so far, the offshore (in the sea) fields that human have explored and developed are:

in terms of water depth,
Shallow Water
Deep Water - water depth deeper than 200m (it could slightly vary from company to company's classification).
at deeper water cost of drilling wells increases.

in terms of type of rock,
Clastic (Sandstone)
Carbonate
Basement

in terms of reservoir pore pressure,
Normal Pressure
High Pressure (more than 10,000 psi)
High Pressure, High Temperature (pressure more than 10,000 psi, temperature more than 350 deg F).

Disclaimer:
The sharing is based on my personal interpretation and understanding. It does not represent any company or engineering body/technical journal.