The gulf is where the US has it's refineries for heavy crude. And refineries are built for specific types of oil. It is inefficient and expensive to run different oils through them. Heavy oil can be cracked down to make the full range of petro products, light oil can't be cracked up.
The same way I suppose , one can make mashed potatoes from potatoes, extract starch etc, but we can't make boiled potatoes from mashed. The process works one way. From heavier to lighter. Crack the heavy long petro molecules to make lighter smaller ones, but not easy to join them.
Here is a news article about a new pipe extension from Canada to the Gulf. $1.4 Billion. Easier to just load a tanker in VZ and sail it across the gulf. Also not have eggs all in one basket too.
Enbridge OKs pipeline expansion to U.S. Gulf Coast | Financial Post
I see reports Rubio has been on telly saying the US does not need VZ oil, the US has loads blah blah, but he is fibbing. The US does not have heavy crude. That's why they buy it from Canada.
Refineries cost billions to built, and they built them where the oil can be supplied to.
Another article here, from Aug 2025, no need to click, I will quote the important bit.
Venezuelan Crude Oil Returns to US After Years of Sanctions (discoveryalert.com.au)
"Gulf Coast refineries, with their sophisticated coking and desulfurization units, are specifically designed to process heavy Venezuelan crude. These facilities operate most efficiently when running the grades of oil they were built to handle, potentially improving refining economics.
Alternative heavy crude sources, such as Canadian oil sands, often come with higher transportation costs and different quality characteristics. The return of Venezuelan crude provides these refineries with more options to optimize their operations."
The oil companies that Chaves kicked out of VZ years ago had built refineries on the gulf coast specifically for VZ oil. When that was cut, they turned to Canadian heavy, from the tar sands. But that costs more.
In that second article, the oil company is Chevron. That's the same company that took the oil that was recently seized... to the gulf coast.
Now, will people be checking to see who Chevron donates to :-)