Well this will be interesting.  KSA has offered to sell off 5% of Saudi Aramco.. the LARGEST National Oil company in the WORLD.. 

Valued by some between 1 to 1.5 Trillion by Wall Street to as much as 2+ Trillion by the Saudi's.

Truth is Nobody really knows.. and the Reason is because.. Nobody really knows how much in Oil Reserves they Have..?

Matthew Simmons wrote a book "twilight in the Desert" which po pooed the amount of Recoverable Oil Reserves KSA had.. this was during the Crude Oil Spike and with the US developing Fracking Technology.. as well as the Passing of Mr Simmons.. this view point has diminished.

Some Claim that with Electric Vehicle's on the horizon that a growing World economy will not need as much Crude Oil in the Future.. ( I would put this at the OTHER end of the spectrum with Mr Simmons..)

Saudi Aramco claims to have 260.8 Billion Barrels of Crude Oil Reserves..

.. which is the SAME NUMBER that Aramco Claimed to have 20 years ago.. 10 years ago.. last year and Now.

Which begs the question.. "IF the 280 Billion number was correct.. and Aramco Produced Crude.. and DID not FIND MORE.. at the SAME RATE as what was produced.. HOW did it MAINTAIN NO DRAW DOWN in Reserves?

Matthew Simmons said BS to that..

The Crown Jewell in Saudi Aramco's portfolio is the SUPER GIANT Oil field Ghawar.. 

( http://www.hydrocarbons-technology.com/features/featureonshore-behemoths-the-worlds-biggest-onshore-oil-fields-4184419/ )

The Ghawar field in Saudi Arabia holds estimated remaining oil reserves of 70 billion barrels, making it by far the world’s biggest onshore oil field. The giant oil field was discovered in 1948 and has been in production since 1951.

The field, which measures 160mi in length and 16mi in width, is in the Al-Ahsa Governorate of Saudi Arabia and comprises six main producing areas namely Fazran, Ain Dar, Shedgum, Uthmaniyah, Haradh and Hawiyah.

Ghawar has produced more than 60 billion barrels of oil in the last 60 years of its operation and continues to produce approximately five million barrels of oil per day. The field is owned and operated by state-owned Saudi Aramco, the world’s biggest oil and gas company.

It most certainly will be interesting to see the Valuation.. and hence the Reserves offered in an IPO of Saudi Aramco.  How this IPO goes will probablly dictate to a certain extent how the World's investments do for 2018.. it's gonna be a big deal. 

Do the Chinese buy it?

An Interesting Read.. 800 billion + barrels of Crude oil.. how much of it is recoverable.. at what price?  $$$

( http://fortune.com/2017/10/24/saudi-arabia-aramco-oil/ )