...
The key elements of Upstream is Petroleum Reservoir and Petroleum Well.
The size, structure and complexity of Petroleum Reservoir can be primarily assessed through the Reserves Classification.
The engineering part of Upstream operations is called Petroleum Engineering which is essentially based on the knowledge areas of:
...
The primary subject of E&P is exploration of a new or acquisition of existing Petroleum Assets and maintaining a profitable production from them.
The E&P activities are conducted by Petroleum Operating Company which also perform search, valuation and acquisition of the new Petroleum Assets and selling existing Petroleum Assets in order to raise the funds for a more profitable investment opportunities.
The Upstream industry is split into two major operational areas: Petroleum Exploration and Petroleum Production:
...
[ Petroleum Asset ] [ Petroleum Reservoir ] [ Petroleum Well ] [ Reserves Classification ]
[ Petroleum Operating Company ] [ Petroleum Service Provider ]
...