Articles | Volume 14, issue 11
Method article
07 Nov 2023
Method article |  | 07 Nov 2023

The influence of extraction of various solvents on chemical properties on Chang 7 shale, Ordos Basin, China

Yan Cao, Zhijun Jin, Rukai Zhu, and Kouqi Liu

Related subject area

Subject area: The evolving Earth surface | Editorial team: Stratigraphy, sedimentology, geomorphology, morphotectonics, and palaeontology | Discipline: Sedimentology
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Cited articles

Abourriche, A. K., Oumam, M., Hannache, H., Birot, M., Abouliatim, Y., Benhammou, A., El Hafiane, Y., Abourriche, A. M., Pailler, R., and Naslain, R.: Comparative studies on the yield and quality of oils extracted from Moroccan oil shale, J. Supercrit. Fluids, 84, 98–104,, 2013. 
Allawzi, M., Al-Otoom, A., Allaboun, H., Ajlouni, A., and Al Nseirat, F.: CO2 supercritical fluid extraction of Jordanian oil shale utilizing different co-solvents, Fuel Process. Technol., 92, 2016–2023,, 2011. 
Cao, Y., Han, H., Liu, H. W., Jia, J. C., Zhang, W., Liu, P. W., Ding, Z. G., Chen, S. J., Lu, J. G., and Gao, Y.: Influence of solvents on pore structure and methane adsorption capacity of lacustrine shales: An example from a Chang 7 shale sample in the Ordos Basin, China, J. Petrol. Sci. Eng., 178, 419–428,, 2019. 
Cao, Y., Han, H., Guo, C., Pang, P., Ding, Z. G., and Gao, Y.: Influence of extractable organic matters on pore structure and its evolution of Chang 7 member shales in the Ordos Basin, China: Implications from extractions using various solvents, J. Nat. Gas Sci. Eng., 79, 103370,, 2020. 
Chen, Y., Mastalerz, M., and Schimmelmann, A.: Characterization of chemical functional groups in macerals across different coal ranks via micro-FTIR spectroscopy, Int. J. Coal Geol., 104, 22–33,, 2012. 
Short summary
Fourier transform infrared (FTIR) was performed on shale before and after solvent extraction. The extraction yield from shale with THF is higher than other solvents. The organic-C-normalized yield of a mature sample is higher than other samples. The aromaticity of organic matter increases, and the length of organic matter aliphatic chains  does not vary monotonically with increasing maturity. The results will help in the selection of organic solvents for oil-washing experiments of shale.