As defined by the U.S. Geological Survey (USGS), heavy oil is a type of crude oil characterized by an asphaltic, dense, viscous nature (similar to molasses), and its asphaltene (very large molecules ...

By Chen Aizhu SINGAPORE (Reuters) -Asian trading firm Cathay Petroleum has agreed an annual deal marketing Brazilian crude oil in the Asia-Pacific region for independent producer Prio, a trading ...

EIA: higher crude density drove part of U.S. crude oil output growth last year. Texas accounted for 57% of the total production of crude oil with an API gravity between 30.1 and 40.0 degrees in the ...

HOUSTON, Oct 22 (Reuters) - Companies drilling for the crude that turned the U.S. into the world's top oil producer face an unexpected dilemma: their West Texas Midland crude is getting lighter, which ...