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A Comparative Study of NSO Compounds in High Thermal Maturity Shale from South China Based on Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
KE Chang-wei, XU Yao-hui |
College of Resources and Environment, Yangtze University, Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Wuhan 430100, China |
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Abstract This research uses a Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) combined with gas chromatography to compare the NSO compounds in the Sinian Doushantuo Formation in western Hubei province and the Longmaxi Formation in the Sichuan Basin. The study of organic heteroatomic types have shown that nitrogen compounds were absent in these two formations, and the DBE (Double Bond Equivalence) values were lower because the rocks are high maturity. The Sinian Doushantuo Formation contains high O3 compounds, while the Longmaxi Formation is mainly composed by O2 compounds. The Sinian Doushantuo Formation was formed from relative occlusion of with a certain amount of evaporation, whereas sedimentary environment of the Longmaxi formation is relatively open, resulting in higher O3S heteroatom compounds in the Sinian Doushantuo Formation than the Longmaxi Formation. Due to exposure to surface, the Longmaxi Formation might have been degraded by microorganisms, containing much higher heteroatom compounds content than the Sinian Doushantuo Formation.
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Received: 28 July 2017
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