* Lehman, Merrill Lynch roil markets, spur flight to quality
* No signs of major damage to U.S. oil sector from Ike
* Oil hits seven-month low
(Updates prices)
By Matthew Robinson
LONDON, Sept 15 (Reuters) - Oil plunged $4 on Monday as investors fled to safer havens due to turmoil in the U.S. financial system and on early signs Hurricane Ike had spared key U.S. energy infrastructure.
Lehman Brothers' <LEH.N> filing for bankruptcy protection and Bank of America's <BAC.N> agreement to buy Merrill Lynch <MER.N> stirred concerns that mounting global economic problems would slow energy demand further, sending investors out of oil. [
]U.S. crude <CLc1> dropped $4.00 to $97.18 barrel at 1506 GMT, after hitting a seven-month low of $94.13 earlier.
U.S. oil fell below $100 briefly on Friday for the first time since early April, and trade was open for a special session on Sunday due to Ike.
London Brent crude <LCOc1> fell $4.77 to $92.81 a barrel.
Oil companies rushed to check damage to their facilities after Hurricane Ike struck the heart of the U.S. energy industry near Houston on Saturday, leaving a quarter of the nation's oil and refined fuel production idled.[
]Early indications showed no major damage to energy infrastructure, though several Texas refineries remained without power. The U.S. Department of Energy said plants suffered minimal damage and were preparing to restart. [
]"The sell-off is partly because Hurricane Ike hasn't done significant structural damage to oil facilities as well as growing concerns about the economy," said David Moore, commodities strategist for Commonwealth Bank of Australia.
"It has been quite a spectacular turn of events at Lehman and Merrill and the stresses in the financial system are sparking concerns about economic outlook and how that will weigh on global energy demand."
U.S. stock markets fell after news of the Lehman bankrupcy and as investors awaited for insurer American International Group <AIG.N> to announce a survival plan as the insurer attempts to avoid becoming the next causualty of the credit crunch. [
]DOLLAR
High fuel prices and wider economic problems have dragged down oil demand in the United States and other large consumer nations, sending crude prices from a record high over $147 a barrel in July.
Oil has been on a six-year rally driven by surging demand from emerging economies like China, with additional support coming this year as investors rushed into oil as a hedge against inflation and the weak dollar.
The U.S. dollar rose on Monday with a broad flight from risk igniting U.S. Treasury debt, gold and the low yielding Japanese yen. [
]"While the flight to quality has seen gold move up today, oil doesn't seem to be getting used as a hedge at the moment, as the sentiment in the market is still bearish," said Michael Davies, analyst at Sucden. China's central bank cut the cost of bank loans for the first time since Feb. 2002 to prop up the slowing economy. [
]Militants in OPEC member Nigeria attacked a Royal Dutch Shell <RDSa.L> oil installation on Monday in a third day of heavy fighting with security forces. [
] (Reporting by Matthew Robinson and David Sheppard in London, Fayen Wong in Perth, editing by Anthony Barker)