Insight into Geochemical Significance of NO Compounds in Lacustrine Shale Source Rocks by FT-ICR MS

Hong Ji, Sumei Li, Hongan Zhang, Xiongqi Pang and Tianwu Xu
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Hong Ji: School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China
Sumei Li: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
Hongan Zhang: Sinopec Zhongyuan Oilfield Company, Puyang 457001, China
Xiongqi Pang: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
Tianwu Xu: Sinopec Zhongyuan Oilfield Company, Puyang 457001, China

Energies, 2022, vol. 15, issue 5, 1-19

Abstract: Nitrogen and oxygen (NO) compounds are important compositions in shale source rocks, and they carry an abundance of geochemical information for hydrocarbon generation. Due to technical limitations, the significance of NO compounds has not been paid enough attention. In this paper, the NO compounds from shale rocks of the Dongpu Depression are analyzed to explore the compositional characteristics and geochemical significance of using geological and organic geochemical ways of rock-eval, gas chromatography-mass spectrometry (GC/MS), and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The results show that shale rocks are rich in NO compounds, with twelve types of compounds that were detected: N 1 , N 1 O 1 , N 1 O 2 , N 1 O 3 , N 1 S 1 , N 1 S 2 , N 2 O 1 , O 1 , O 2 , O 3 , O 3 S 1 , and O 4 . Of these compounds, O 2 and O 3 predominated, followed by N 1 and N 1 O 1 . Of the N 1 species, the most abundant classes are DBE of 9, 12, 15, and 18, which changed with maturity. Of the O 2 species, compounds of DBE of 1 (fatty acids) are the predominant class. Classes of DBE 5 and 6 in the O 2 species are naphthenic acids with special biological skeleton structures, which are usually appear in immature and low-mature oils. N 1 , O 2 , and N 1 O 1 compounds are affected by their maturity and they often run to polarization with enhanced DBE species and a shorter carbon chain as their maturity increases. The parameters of DBE 18–25 /DBE 9–18 -N 1 and DBE 12–20 /DBE 5–12 -O 2 increase with the increase of buried depth and maturity. The NO compounds that were revealed by FT-ICR MS may have a promising application in distinguishing between the different depositional environments. Source rocks of saline lacustrine are rich in O 2 and N 1 O 1 , but less N 1 and O 1 compounds. The research results are of vital importance for expanding the application of the NO molecular compounds in petroleum exploration.

Keywords: source rocks; nitrogen and oxygen compounds; FT-ICR MS; geochemical significance; Dongpu depression (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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