US Cash Crude-Grades slip as traders see ample supplies

May 15 (Reuters) - Grades broadly fell on Thursday, dealers said, as investors weighed ample global supplies, and the potential for more barrels to enter the market pending a U.S. nuclear deal with Iran.

World oil supply will rise more rapidly than previously expected this year as Saudi Arabia and other OPEC+ members unwind output cuts, the International Energy Agency (IEA) said on Thursday, despite a lower forecast from U.S. shale producers.

The IEA expects global supply to rise by 1.6 million barrels per day this year, up 380,000 bpd from the previous forecast, the agency, which advises industrialised countries, said in a monthly report.

Meanwhile, U.S. President Donald Trump said that the U.S. was getting close to securing a nuclear deal with Iran, and Tehran had "sort of" agreed to the terms.

An Iranian official told NBC News in an interview published on Wednesday that Iran was willing to agree to a deal with the U.S. in exchange for lifting economic sanctions.

Sanctions relief stemming from a nuclear agreement could unleash an additional 800,000 barrels per day of Iranian crude for the global market, SEB analyst Ole Hvalbye said.

* Light Louisiana Sweet WTC-LLS for June delivery fell 60 cents to a midpoint of a $1.80 premium and was seen bid and offered between a $1.75 and $1.85 a barrel premium to U.S. crude futures CLc1

* Mars Sour WTC-MRS fell 25 cents to a midpoint of a $1.25 premium and was seen bid and offered between a $1.15 and $1.35 a barrel premium to U.S. crude futures CLc1

* WTI Midland WTC-WTM fell 5 cents to a midpoint of a 60-cent premium and was seen bid and offered between a 50-cent and 70-cent a barrel premium to U.S. crude futures CLc1

* West Texas Sour WTC-WTS rose 15 cents to a midpoint of a 20-cent discount and was seen bid and offered between a 30-cent and 10-cent a barrel discount to U.S. crude futures CLc1

* WTI at East Houston WTC-MEH, also known as MEH, traded between a 70-cent and 90-cent a barrel premium to U.S. crude futures CLc1

* ICE Brent July futures LCOc1 fell $1.56 to settle at $64.53 a barrel

* WTI June crude CLc1 futures fell $1.53 to settle at $61.62 a barrel

* The Brent/WTI spread WTCLc1-LCOc1 narrowed 5 cents to last trade at minus $3.36, after hitting a high of minus $3.31 and a low of minus $3.43