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* U.S. lawmakers to debate massive stimulus package

* OPEC+ Jan compliance with oil cuts reaches 85% -Petro-Logistics

* Indonesia seizes Iran-flagged vessel over fuel transfer

(Adds settlement prices)

By Stephanie Kelly

NEW YORK, Jan 25 (Reuters) - Oil prices rose about 1% on Monday as optimism around U.S. stimulus plans and some supply concerns boosted futures, but demand worries prompted by coronavirus lockdowns limited gains.

Brent crude futures rose 47 cents, 0.9%, to settle at $55.88 a barrel. U.S. West Texas Intermediate crude ended 50 cents, or 1%, higher at $52.77 a barrel.

Officials in U.S. President Joe Biden's administration on a Sunday call with Republican and Democratic lawmakers tried to head off Republican concerns that his $1.9 trillion pandemic relief proposal was too expensive.

"Newly inaugurated President Biden seems to be pushing for a quick approval of his proposed $1.9 trillion pandemic relief package, a development interpreted by the market as a clear indication that the new U.S. administration aims to kick-start an economic recovery, which will naturally benefit fuel consumption," said Bjornar Tonhaugen, Rystad Energy's head of oil markets.

On the supply side, the Organization of the Petroleum Exporting Countries and its allies' compliance with pledged oil output curbs is averaging 85% so far in January, tanker tracker Petro-Logistics said on Monday. The data suggest the group had improved its adherence to pledged supply curbs.

In Indonesia, the country said its coast guard seized an Iranian-flagged tanker over suspected illegal fuel transfers, raising the prospect of more tensions in the oil-exporting Gulf.

Output from Kazakhstan's giant Tengiz field was disrupted by a power outage on Jan. 17.

Meanwhile, European nations have imposed tough restrictions to halt the spread of the virus, while China reported a rise in new COVID-19 cases, casting a pall over demand prospects in the world's largest energy consumer.

Barclays raised its 2021 oil price forecasts, but said rising cases in China could contribute to near-term pullbacks.

(Reporting by Stephanie Kelly in New York; additional reporting by Noah Browning in London; Editing by Marguerita Choy and David Evans)

((Stephanie.Kelly@thomsonreuters.com; 646-223-4471; Reuters Messaging: stephanie.kelly.thomsonreuters.com@reuters.net))