Exxon boss, Saudi minister differ on oil supply outlook

* U.S. shale declines have largely stopped -Tillerson

* Saudi's Falih warns supply declines to accelerate

* Total CEO sees 5-10 mln bpd supply shortage by 2020

By Ron Bousso and Karolin Schaps

LONDON, Oct 19 (Reuters) - Exxon Mobil's boss Rex Tillerson and Saudi Arabia's energy minister on Wednesday took opposing views on declining investment in the oil sector setting the stage for a possible major supply crunch.

More than two years of downturn that saw oil prices halve to around $50 a barrel today after a boom in U.S. shale oil production have led to a sharp decline in investment.

But Tillerson, who heads the world's largest listed oil and gas company, said that shale oil producers' resilience in cutting costs to make some wells profitable at as low as $40 a barrel means that North American production has effectively become a swing producer that will be able to respond rapidly to any global supply shortage.

"I don't quite share the same view that others have that we are somehow on the edge of a precipice. I think because we have confirmed viability of very large resource base in North America that serves as enormous spare capacity in the system," Tillerson told the Oil & Money conference.

"It doesn't take mega-project dollars and it can be brought on line much more quickly than a 3-4 year project," he said.

His stance contrasted with that of Saudi Arabia's Energy Minister Khalid al-Falih, who minutes earlier warned the same event that the sector faces challenges due to the drop in investment.

"Market forces are clearly working. After testing a period of sub $30 prices the fundamentals are improving and the market is clearly balancing," Falih said.

"On the supply side, non-OPEC supply growth has reversed into declines due to major cuts in upstream investments and the steepening of decline rates," the minister said.

"Without investment, that trend is likely to accelerate with the passage of time to the point that many analysts are now wending warning bells over future supply shortfalls and I am in that camp."

Falih said that OPEC's plan to freeze or even cut production along with several leading producing countries, including Russia, will help reduce a huge overhang of supplies and stimulate new investments in the sector.

Saudi Arabia, has changed its course this year and decided to support production cuts following two years of refusal to do this in order to win the market share back from U.S. shale producers.

Tillerson's remarks about the resilience of U.S. supply shone on a fresh light on Saudi calculations of the impact of lower prices, which Riyadh orchestrated in 2014, on the North American oil industry.

NO PRICE BLOW OUT

Tillerson said that while U.S. shale production has dropped recently, the declines have largely stopped.

"I don't necessarily agree with the premise that there is a more steep decline to come (in U.S. shale), in fact that are still some levels of uncompleted wells that can be brought on."

"It is difficult for me to see a big supply press out there, it is difficult for me to see a big price blow out, there are too many elements in the system that will temper that," Tillerson said.

"I don't necessarily have the view that we are setting ourselves up for a big crunch within the next 3, 4, 5 years."

Echoing the Saudi minister, Patrick Pouyanne, the chief executive officer of French oil and gas company Total, expected supplies to fall short by 5 to 10 million barrels per day by the end of the decade after investments in the sector dropped from $700 billion two years ago to $400 billion this year.

"We are today facing a situation where we do not invest enough... this is not enough to prepare the future supply Without investment, the oil industry will not be able to offset the natural 5 percent natural decline of fields and meet demand growth of even 1 percent."

"I know that the shale oil industry is very innovative and they have cut costs and adapt but we won't be able, if we continue this way, to fill the gap," Pouyanne said.

He said that Total will be able to balance its capital spending of up to $17 billion with oil at $55 a barrel next year. (Editing by William Hardy)

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