Oil shale samples from Ellajun Area were pyrolysed in different pyrolysing environments. Nitrogen, steam, mixture of steam and nitrogen, and mixture of hydrogen and steam were used as sweeping mediums. The experimental conditions were 500 g of sample weight, one atmospheric operating pressure, and 410C to 550C temperature range. Total weight loss of samples were recorded as a function of temperature. Condensed liquid products were distilled in a simple distillation. Un-condensable gases vented without analysis. The total weight loss of the sample increased with increasing retorting temperature, and the oil yield passed through a maximum value with total weight loss and increasing temperature. The distillation results showed a clear impact of the reaction environment on the percent volume distilled and the sulfur content of the liquid fraction.