A set of knowledge domains facilitating Upstream operations:

Petroleum Geology	Studying reserves structure and volumes
Rock Geomechanics	Studying response of rock and rock masses to the forces or displacements
Petrophysics	Studying rock properties
Reservoir Engineering	Modelling well and reservoir flow dynamics and generating forecasts
Well & Log Analysis	Designing and interpretation of well logs
Well Testing	Designing and interpretation of well tests
Production Analysis	Long-term analysis of production history
Fluid Analysis (PVT)	Modelling fluids produced from or injected into the petroleum

reservoirReservoir Flow SimulationsModelling well and

flow dynamics and generating forecasts


Drilling Engineering	Designing and

executing

monitoring the well drilling
Workover Engineering	Designing and

executing

monitoring workovers
Production Technology	Well Performance Analysis and

production optimization

Production Planning
Subsurface Chemical Engineering	Designing the chemical treatments

facilitating

facilitating the optimal well and reservoir performance
Field Development Planning	Creating Field Development Plans

In most common sense this set is equivalent to what is also called Field Study and ModellingThe first three disciplines and a part of the fourth discipline are often refereed as Geology and Geophysics (G&G).

Reference

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