Simulation Experiment Study on Impacting the δD Value of Aromatic Compounds. (18th April 2023)

• Record Type: Journal Article
• Authors: Duan, Yi; Wu, Yingzhong; Xing, Lantian; Wu, Yingqin; Zhao, Yang; Li, Zhongping; Ma, Lanhua
• Other Names: Teng Bailu Academic Editor.
• Is Part Of: Geofluids. Volume 2023(2023)
• Publication Date: 2023-04-18
• Subjects: Hydrogeology -- Periodicals; Sedimentary basins -- Periodicals; Fluids -- Migration -- Periodicals; Groundwater flow -- Periodicals; Geothermal resources -- Periodicals; Fluid dynamics -- Periodicals; Earth -- Crust -- Periodicals; 551.49
• DOI: 10.1155/2023/4315164
• Languages: English
• ISSNs: 1468-8115

Abstract

Abstract : Little is known about the effects of sedimentary environment and maturity on δ D values of aromatic compounds deposited in geological bodies. Our simulation experiments showed that the δ D value of pyrolytic polycyclic aromatic hydrocarbons (PAHs) was significantly different between the studied samples from high and low latitude regions. Comparative studies showed that the δ D values of PAHs produced by pyrolysis were related to those of water in the two regions. With increasing maturity, the δ D value of the PAHs becomes higher. Additionally, it was observed that some PAHs exhibited a propensity to increase the δ D value upon demethylation. The thermodynamic fractionation of hydrogen isotopes between the PAHs produced by pyrolysis and both the n -alkanes and methane produced by pyrolysis indicated that the hydrogen isotopic value of the PAHs was higher than that of the n -alkanes or methane. The long-chain alkylbenzene produced by pyrolysis has a higher mean δ D value compared with the n -alkanes produced by pyrolysis, but it is lower than that of the PAHs in the same sample. The lowest δ D value among the aromatics was found in the ring A monoaromatic steroids produced by pyrolysis. The low δ D values of these steroids should originate from isotopic fractionation during isoprenoid lipid biosynthesis.