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If the periphery is closed and the elevation of the edge is consistent with that of the oil-water interface, it is called a closed reservoir, and its profile is called a closed edge.

If the periphery of the reservoir is connected with the natural water source, it can supply liquid to the reservoir, which is called an open reservoir, and the projection of the outline is called the supply edge.

There are five types of reservoir driving: hydraulic drive, elastic drive, pneumatic drive, dissolved gas drive and gravity drive.