The purpose of laboratory analysis of Crude or deposit sample is to find out its compositional analysis.
For crude, content of saturates (waxes), Asphaltenes, resins & aromatics determine its tendency to precipitate out deposition i.e. known as CII ( colloidal instability index). Other properties like pour point /WAT/TAN also determine its nature. For deposit, compositional analysis determine the treatment to be provided for its dissolution/dispersion. If formation water is also available, its analysis determine the scaling tendency.