Crudes contain varying levels of water, sand, asphaltenes, resins, paraffin, and other constituents that may impact refining, storing, and transportation methods.

• 原油的含有水分、沙粒、沥青烯、树脂、石蜡和其它可能对提炼、储藏和运输方式产生影响的组成物质的含量水平层次不齐。