Organic geochemistry of the Jurassic tar-rich coal in Northern Shaanxi Province

Authors

ZHANG Ning, School of Civil Engineering, Hebei University of Engineering, Handan 056038, China; First Exploration Bureau, China National Administration of Coal Geology, Handan 056004, China
XU Yun, Key Laboratory of Resources Survey and Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaFollow
QIAO Junwei, School of Geology andEnvironment, Xi'an University of Science and Technology, Xi'an 710054, China
NING Shuzheng, General Prospecting Institute, China National Administration of Coal Geology, Beijing 100039, China

Abstract

The organic geochemical characteristics of tar-rich coal are of great significance to study the paleosedimentary environment and evolution of coal seams. Taking coal samples from 6 main coal seams of Yan’an Formation in Northern Shaanxi Province as the research object, this paper analyses the organic geochemical characteristics of coal seams by coal quality analysis and gas chromatography-mass spectrometry. The results showed that coal samples had a high abundance of chloroform asphalt "A" and a low saturated hydrocarbon/aromatic hydrocarbon ratios, characterized by the unimodal pattern of n-alkanes and dominated by medium chainsaturated hydrocarbons. The ratios of Pr/C₁₇, Ph/C₁₈and Pr/Ph were relatively high, regular sterane and diasteranes of C₂₈ and C₂₉ were dominant in steranes. The organic matter was in the low-mature-mature stage, which was a favorable stage for perhydrousvitrinite and lipinite to generate oil. The source of organic matter were from terrestrial organic matte and aquatic organisms and which formed in the anoxic environment and undergoed strong biodegradation. All of these provided favorable conditions for the formation of perhydrousvitrinite.

Keywords

Northern Shaanxi Province, Yan’an Formation, tar-rich coal, organic geochemistry

DOI

10.3969/j.issn.1001-1986.2021.03.006

Recommended Citation

ZHANG Ning, XU Yun, QIAO Junwei, et al. (2021) "Organic geochemistry of the Jurassic tar-rich coal in Northern Shaanxi Province," Coal Geology & Exploration: Vol. 49: Iss. 3, Article 7.
DOI: 10.3969/j.issn.1001-1986.2021.03.006
Available at: https://cge.researchcommons.org/journal/vol49/iss3/7

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