− | High-sulfur and low-sulfur oils have fundamentally different origins. Most high-sulfur oils come from nonclastic [[source rock]]s. Although some extremely rich clastic source rocks like the Kimmeridge Clay of the North Sea also yield moderately high-sulfur oils, most clastic source rocks yield oils with less than 0.5% sulfur by weight. However, sulfur content is also a function of maturity. | + | High-sulfur and low-sulfur oils have fundamentally different origins. Most high-sulfur oils come from nonclastic [[source rock]]s. Although some extremely rich [http://www.merriam-webster.com/dictionary/clastic clastic] source rocks like the [[Kimmeridge Clay]] of the North Sea also yield moderately high-sulfur oils, most clastic source rocks yield oils with less than 0.5% sulfur by weight. However, sulfur content is also a function of maturity. |