Crude oil is delivered from terminals to refineries through Underground Pipelines.
There are many ways of transporting oil from terminals to different places like trough Trucks, Pipelines, Rail cars etc. Marine vessels is another way of transporting oil, but this is used to deliver oil to other countries.
Safest way to deliver crude oil to refineries is through pipelines because oil is highly dangerous and it can spill out while being moved trough trucks, rail cars etc and can cause large damages.