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Yuechao Yang

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Proceedings Article | 21 March 2023 Paper

Spectral characteristics analysis of different minerals impregnated by crude oil fractions

Xin Cui, Kai Qin, Yuechao Yang, Ling Zhu

Proceedings Volume 12595, 125950S (2023) https://doi.org/10.1117/12.2667158

KEYWORDS: Minerals, Absorption, Contamination, Diagnostics, Analytical research, Calcite, Matrices, Fluorite, Spectroscopy

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One of the key fundamental scientific issues in the study of hyperspectral detection of oil and gas seepage is to determine the diagnostic spectral characteristics of surface soils and altered minerals during oil and gas seepage. In this study, various crude oil fractions were used to contaminate different minerals. The same crude oil was fractionated according to four temperature ranges: 0-120°C, 120-200°C, 200-275°C and 275-350°C. Subsequently, fractions from these four temperature ranges were used to contaminate four mineral powders (limonite, illite, calcite and fluorite) at doses of 1 ml to 10 ml. The spectral measurements and processing of the mixed matrices were carried out, the spectral characteristics and variation patterns were analyzed, and the spectral libraries of the four mineral mixed matrices were constructed for different crude oil fractions and different contaminated dose. The results show that all contaminated minerals have distinct hydrocarbon characteristic absorption peaks near the 1730 nm and 2300 nm positions. However, the hydrocarbon diagnostic feature peaks of the mixed matrix contaminated with crude oil are influenced by the original spectral characteristics of the minerals: the simpler the spectral characteristics of the mineral itself, the more positions of hydrocarbon absorption peak the mixed matrix spectrum exhibits, and the more obvious and prominent the characteristics. Meanwhile, the characteristic absorption peak of hydrocarbon is controlled by the type of crude oil fraction and the contamination dose. The heavier the crude oil fraction, the higher the contamination dose, the greater the absorption depth and area of the hydrocarbon diagnostic absorption peak.

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