TOKYO, Jan 11 (Reuters) - Saudi Arabia, the world's top crude oil exporter, has told at least one Asian refiner that it will curb crude supplies by less than 1 percent from contracted volumes in February, an industry source familiar with the matter said on Wednesday.

The cuts were applied equally from heavier to lighter grades, the source said. The buyer last month was allocated slightly higher than contracted volumes for January.

(Reporting by Osamu Tsukimori; Editing by Richard Pullin) ((osamu.tsukimori@thomsonreuters.com, +813 6441 1857, Reuters Messaging: osamu.tsukimori.thomsonreuters.com@reuters.net;))