The Oil Content Inversion of Tar Sands by Spectroscopy

Oil content is an important parameter of tar sands resource evaluation and utilization. They are time-consuming, large toxicity solvent, complex operation, and sample ruining problems in traditional oil content determination method of tar sands. Reflection spectroscopy can provide a fast and nondestructive method in the analysis of material composition. Therefore, the oil content of tar sands can be calculated quickly and nondestructively by analyzing the characteristics of high spectral data of tar sands. But the bands of high spectral data are too many and the data are large redundancy. In order to improve the utilization rate of spectral data, the correlation coefficient was used as the measuring index for screening the sensitive band of hydrocarbons in tar sands. On the one hand, the oil rate inversion models were established by hydrocarbon spectral index constructed by the sensitive spectral bands of hydrocarbon. On the other hand, the absorption features were quantified by spectral absorption characteristic parameters and the inversion models of oil content were established. The results showed that the selected bands by correlation coefficient could be used to indicate the oil content; the spectral index models by first-order differential treatment were better than the original reflectance; the oil content inversion models constructed by the spectral absorption area of the seven characteristic absorption bands were superior to other forms.