Investing.com - Oil prices fell on Tuesday ahead of the release of U.S. stockpile data.
U.S. crude was down 105 cents, or 2.27% at $45.24 at 0705ET, while Brent crude shed 94 cents or 1.95% to trade at $47.38.
Libyan forces opposed to the government on Monday tightened their control of four major oil ports, raising supply concerns.
Industry figures from the American Petroleum Institute are due out later in the session.
These will be followed Wednesday by official Energy Information Administration data.
U.S. crude stocks are forecast rise by 4.5 million barrels after the huge draw of $14.5 million barrels the previous week.
The dollar index was higher. A stronger dollar depresses demand for oil.