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Resin composition: An indicator of oil maturity as revealed by fourier transform ion cyclotron resonance mass spectrometry

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Petroleum Science 2023年第2期20卷 769-775页

作者： Tian Liang Zhao-Wen Zhan Guo-Xiang Wang Yan-Rong Zou State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryGuangzhouGuangdong510640China CAS Center for Excellence in Deep Earth Science GuangzhouGuangdong510640China University of Chinese Academy of Sciences Beijing100049China

A pyrolysis experiment was carried out on a Dongying Depression kerogen sample to separate the resin from the oil. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) with a positive-ion detector was used to detect the relative proportional changes in the compounds of the resin. During the whole pyrolysis experiment, the relative ratio of resin exceed 10% of the soluble component at each temperature point. Five compounds were detected from the resin: N1, N1O1, N1O_(2), O1, and O_(2). To research the changes in the proportions of the compounds during pyrolysis clearly, these five compounds were divided into three classes: N1, N1Ox, and Ox. The N1 class has the largest proportion in resin at the beginning of the pyrolysis, while Ox class has the least proportion. And the relationship between the number and the molecular mass of three classes compound was researched. With increasing maturity, the proportion of N1 and the N1Ox class decreased rapidly, while the Ox class increased slowly. Through researching these resin compounds, it was found that an inversion in the proportions of above three compounds appeared at the end of the oil window. At the same time, we found that the DBE and carbon number of resin compounds have changed obviously during the pyrolysis: the DBE increased, while the carbon number decreased significantly. And the details of the change of each compound have been researched. This research extends our knowledge of judging the maturity of crude oil during the pyrolysis through the characteristics of compounds in resin and provides the new index based on resin for the evaluation of thermal evolution stage and hydrocarbon generation capacity of source rocks.

关键词： Resin Pyrolysis FT-ICR MS heteroatom compound Maturity DBE

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