The Orinoco Belt consists of large deposits of extra heavy crude. Venezuela's heavy oil deposits of about 1,200 billion barrels (1.9×1011 m3), found primarily in the Orinoco Petroleum Belt, are estimated to approximately equal the world's reserves of lighter oil.[1] Petróleos de Venezuela S.A. has estimated that the producible reserves of the Orinoco Belt are up to 235 billion barrels (3.74×1010 m3)[2] which would make it the largest petroleum reserve in the world, slightly ahead of the similar unconventional oil source in the Athabasca oil sands, and before Saudi Arabia.[3] In 2009, the US Geological Survey increased the estimated reserves to 513 billion barrels (8.16×1010 m3) of oil which is "technically recoverable (producible using currently available technology and industry practices)."