Saudi Arabia's state-owned company
Aramco is the world's biggest oil producer, generating 10% of the
world's oil, but it is also one of the world's most profitable
businesses.
For a drone attack to have knocked half of its - and
5% of the world's - oil supply offline, speaks to the vulnerability of
their plants and in turn to the vulnerability of a vital part of the
global energy infrastructure. The Khurais oilfield produces about 1% of the world's oil, and Abqaiq is the company's largest facility - with the capacity to process 7% of the global supply.
Questions being asked centre on whether this attack could not have been prevented by a company with such deep pockets and whether it can happen again.
Market reaction
A barrel of crude oil cost $60 (£48) on Friday and some analysts believe that could spike up to $80 (£64) or more - a knee-jerk response from traders to the shock attacks and to the many unknowns still surrounding the scale of the damage.Almost three quarters of Aramco's oil goes to Asia.
When oil trading starts in Asia later on Monday (00:00 GMT), we'll get our first indication of how markets have digested the scale of the damage and how prices have been affected.
Regional risk
The worry is, if the attacks stoke broader tensions in the region, then these price rises could be more long-term.Professor Butler believes "if retaliation becomes a reality, any spike could be sustained feeding the risk of an economic recession".
For Helima Croft, Global Head of Commodity Strategy at the Royal Bank of Canada, these drone attacks are "a game changer in the escalating Iranian regional stand-off".
Production facilities, trading routes and pipelines which thread through the region could all be vulnerable to future attacks.
Consumer impact
It is far too early to tell whether consumers will see any financial impact from a rising oil price.In the short term, much depends on how long a spike lasts - and any rise would take weeks to feed through into petrol prices.
For now, investors are closely watching for more statements from Aramco and for any political reaction to events.
https://www.bbc.com/news/business-49708220