Regardless of the change in the global energy map and the continuous swift growth in the use of wind and solar technologies, crude oil continue the leading source of energy.Crude oil sample seperated into different fractions using the SARA fractionation method. Russian crude oil characterized by electrospray ionization time of flight mass spectrometry techniques.The data which obtained from mass spectrometer exported to into the excel program and sorted depending on intensities,carbon number,DBE values and etc. This thesis will concentrate on analysis and data interpretations of saturated fraction in a sample of crude oil.