What we know so far
2 key Saudi oil installations were part of a 10 drone attack on Saturday. They were Abqaiq, that region processes 7M bpd of crude and Khurais, the second-largest oil field in Saudi Arabia with capacity to pump around 1.5 million b/d of mainly Arab Light crude.
Yemen’s Houthi rebels claimed responsibility.
Saudi Oil Ministry confirmed that 5.7M bpd of oil capacity was affected in attack (just over half of current production numbers) and 2B cubic feet of gas used to produce 700K barrels of nat gas liquids also affected. https://www.spa.gov.sa/viewfullstory.php?lang=en&newsid=1969119#1969119
US Military claimed that the attacks came from the Northwest and ruled out Yemeni involvement instead saying the attacks had to come from Iranian installations in Iraq or from Iran. https://www.reuters.com/article/us-saudi-aramco-fire-pompeo/u-s-blames-iran-for-saudi-attacks-pretend-diplomacy-idUSKBN1VZ0ML
Iran vehemently denied this and warned the US that military assets were within range of their missiles https://www.theguardian.com/world/2019/sep/15/iran-denies-drone-attacks-on-saudi-arabia-aramco-ab-qaiq-oil-facility
Now we are waiting for an assessment update from Saudi Arabia on recovery, inventories, spare capacity etc. (a million articles on varying time frames are floating around…no official word from the Ministry however)