What is actually moving
Arab Light flows on its own, boils into useful products without cracking, and can be run by an ordinary refinery on any continent. Put next to the Venezuelan route, it shows how much of a supply chain is decided by chemistry rather than by policy.
- The material
- Crude Oil
- The variety
- Light sour crude, roughly 33° API, moderate sulfur
- Where it starts
- Saudi Arabia — Ghawar and the eastern Saudi fields
Step by step, and border by border
Saudi Arabia · Eastern Province held by Saudi Aramco (State producer)
Out of the reservoir under its own pressure
Conventional wells, with water injected to maintain reservoir pressure. The crude flows without heating or dilution.
Why here: Same as anywhere: the oil is where the oil is.
Saudi Arabia · Abqaiq held by Saudi Aramco (State producer)
Stabilisation, and nothing else
Gas and hydrogen sulfide are separated out and the crude is stabilised for shipping. No diluent, no upgrader, no coker.
What happened to the rest: The associated gas is not waste — it feeds the petrochemical industry and the power that runs the whole operation.
Why here: Stabilisation always happens close to the field. That it is ALL that happens is the point of this journey.
Saudi Arabia · Ras Tanura held by Shipowners and buyers (Trader)
Straight onto a VLCC
Loaded and sailed. Most cargoes are sold on term contracts to refiners who have taken the same grade for decades.
Why here: Ras Tanura is the outlet. The vulnerability of this journey is not the refinery — it is the 40 km-wide strait the tanker sails through.
South Korea · Ulsan, Rotterdam, Houston — the buyer's choice held by Refiner (Refiner)
Any competent refinery will take it
Atmospheric distillation splits the barrel; a hydrotreater removes sulfur; a reformer raises the octane of the naphtha. No deep conversion is required.
What happened to the rest: Volume comes out slightly HIGHER than it went in — cracking and reforming produce lighter, less dense molecules. Refiners call it processing gain.
Why here: Nowhere in particular, and that is the whole lesson: because the crude is easy, the buyer can be anyone.
South Korea · Refinery gate held by Fuel and petrochemical buyers (Manufacturer)
Fuel, and the feedstock for plastics
Petrol, diesel and jet fuel, plus naphtha that goes to a steam cracker to become ethylene and the plastics that follow from it.
Why here: Refineries are built next to the demand, or next to a port that reaches it.
This is a worked example. It follows a stated starting quantity through published typical yields and recoveries, so the proportions are checkable; it is not a record of a specific shipment. Route facts — which countries, which processes, and why the material cannot simply be handled somewhere else — are compiled from public reporting.