Update. Oil station MUST NOT BE placed on center of Oil deposit. Offseting it by one tile ALLOWS to pump to work. Very strange that water ways are forced to 2x2 grid instead of 1x1. So player is forced to place oil station in specific way so pump could reach the boat. Duh... :/
Waterways are reskinned rails. Rails are always placed on the 2x2 grid. Oil deposits are not. It's a coincidence that they didn't line up this time, and yes that's the reason you can place the oil rig off center.