Characteristics of Hydrogen-rich Coals in Southern China:Implications from Organic Geochemistry and Carbon Isotopic Compositions  

作　　者：LIN Yuhan WANG Shaoqing YANG Zongda ZHAO Yungang YANG Yi 

机构地区：[1]College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China [2]Wanbao Mining Ltd.,Beijing 100053,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第1期309-320,共12页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Research Project No.41472132,41102097)。

摘　　要：The organic geochemical characteristics of hydrogen-rich coal in southern China were investigated synthetically through organic geochemistry and carbon isotope analyses.The results showed that the hydrogen contents of the test samples were more than 5.0% and the H/C atomic ratios were between 0.76-1.06.Samples were found to be composed mostly of Type Ⅱ-Ⅲ℃ kerogen,consistent with good hydrocarbon-generation potential.The R_(o)(0.54-1.10%)and T_(max)(430-453℃)values imply that the hydrogen-rich coals were in low maturity to mature stages.Stable carbon isotopic ratios(δ^(13)C_(org))of the samples used varied from −24.5‰ to −23.4‰,the barkinite content ranging from 13.9% to 83.3%,indicating a predominantly terrestrial origin with marine influence during coal formation.Some organic geochemical parameters showed corresponding changes as the hydrogen content increased from 5.0% to 7.0%,however,the source inputs changed significantly when hydrogen content was greater than 6.0%.Terrestrial higher plants gradually become predominant within the coal-forming materials,whereas this dominant position is not apparent at lower hydrogen contents,which is attributable to the strong seawater effect during the hydrogen-rich coal formation process.

关 键 词：hydrogen-rich coal carbon isotope geochemistry ROCK-EVAL GC GC-MS 

分 类 号：P618.11[天文地球—矿床学]