Method for making marine bunker fuels

A method for making a low sulfur marine bunker fuel composition with a reduced concentration of components that have been cracked, the method comprising:

• producing an uncracked gasoil product by contacting a gasoil feed stream having at least 2000 wppm sulfur content with a hydrogen-containing gas in the presence of a hydrotreating catalyst under effective hydrotreating conditions in a catalytic feed hydrotreater, such that the product exhibits at most 5000 wppm sulfur content, a T5 boiling point of at least 280° C., a T50 boiling point of at least 400° C., a T95 boiling point of at least 510° C., a pour point of at least 7° C., and a kinematic viscosity of at least 12 cSt at about 50° C., without the product being subject to cracking;
• optionally blending at least a portion of the uncracked gasoil product with 0-70 vol % of other components, selected from viscosity modifiers, pour point depressants, lubricity modifiers, antioxidants, and combinations thereof, to form a marine bunker fuel composition containing the uncracked gasoil product and having:
• at most 5000 wppm sulfur content;
• at most 25 vol %, based on all components of the marine bunker fuel composition, of residual components selected from crude fractionation vacuum resid, deasphalted vacuum resid, slurry oil, and combinations thereof;
• less than 50 vol %, based on all components of the marine bunker fuel composition, of residual components, components subject to a refinery cracking step, or both;
• and
• at least one of a kinematic viscosity at about 50° C. from 12 cSt to 50 cSt, a density at about 15° C. from 0.90 g/cm3 to 0.94 g/cm3, a pour point from 7° C. to 45° C., and a calculated carbon aromaticity index of 850 or less.