Each crude oil type has unique molecular and chemical characteristics.
Assay data help refineries determine if a crude oil feedstock is compatible for a particular petroleum refinery or if the crude oil could cause yield, quality, production, environmental and other problems.
Testing can include crude oil characterization of whole crude oils and the various boiling range fractions produced from physical or simulated distillation by various procedures.
Information obtained from the petroleum assay is used for detailed refinery engineering and client marketing purposes.
Feedstock assay data are an important tool in the refining process.