Instrumental neutron activation analysis (INAA) using Ghana's low flux Miniature Neutron Source Reactor (MNSR) was utilized to analyze twelve trace elements namely Al, Au, As, Br, Cl, Ga, K, Mn, Mo, Na, V and Zn in seven different crude petroleum samples from different oil fields in the Niger/Delta region of Nigeria. The results obtained indicate that the concentration ranges of the elements show some variability in compositions and concentrations from field to field. The measured low As and S contents of the samples suggest that the crude oils have low hazardous impact on the environment.