Laser Induced Breakdown Spectroscopy (LIBS) technique used to detection of the basic elements in crude oil sample collecting from Melut oilfield in Sudan. The irradiation of the sample was done by using Q-Switched ND-YAG Laser 1064 nm set with pulse energy 150, 170, 190 mJ. Such plasma emission spectrum was collected using wide band fused-silica optical fiber of one-meter length connected to a portable Ocean Optics USB 2000+ spectrometer of range (200 nm to 1100 nm). Crude oil can vary with the location and age of the field in addition to any variations that occur with the depth of the individual well. Two adjacent wells may even produce oil with very different characteristics. The sample was irradiated by pulse laser energy 150, 170, 190 mJ, the main elements in crude oil samples (C, H, O, N and S) were found in all samples by using LIBS technique. The spectra of the samples showed different amounts of main elements of crude oil with different ionization stages. The peaks were identified with help of NIST-ASD and Origin Pro 9 software. LIBS technique proved to be a good, fast, accurate, technique in the detection of main elements in crude oil sample.

Keywords : Laser-Induced Breakdown Spectroscopy, Main Element-Crude Oil, Melut Oilfield.