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 ...

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 ...

NEW YORK/HOUSTON, Jan 16 (Reuters) - Plains All American's told shippers on Friday that crude moving through its West Texas and New Mexico pipeline systems is surpassing pressure limits, according to ...