Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-11-03 DOI:10.1016/j.coal.2024.104643
{"title":"Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden","authors":"","doi":"10.1016/j.coal.2024.104643","DOIUrl":null,"url":null,"abstract":"<div><div>The middle (Miaolingian) to upper (Furongian) Cambrian Alum Shale Formation in the DBH15/73 core from south-central Sweden was exposed to local heat from a diabase intrusion, providing an opportunity to investigate the molecular geochemical response to thermal stress. Organic petrological observations and biomarker analyses were conducted to study changes in maturity-indicating parameters and the distribution of high molecular weight polycyclic aromatic hydrocarbons (PAHs) during the maturation process. The DBH15/73 samples exhibit a maturity gradient, ranging from immature at the base to mature in the upper part of the Alum Shale Formation. Multiple maturity-based biomarker parameters were analyzed, and Ts/(Ts + Tm), M<sub>30</sub>/(M<sub>30</sub> + H<sub>30</sub>), and Hopane H<sub>32</sub>: 22S/(22S + 22R) of saturated hydrocarbon parameters are found to be more reliable. Ratios of alkylnaphthalenes, alkylphenanthrenes, and alkyldibenzothiophenes (MNR, DNR, TMNr, TeMNr, MPI-1, MPR, MDR, and DMDR) also showed consistent correlations with thermal maturity. Thermal maturation impacted the macromolecular structure, resulting in the aromatization and demethylation, leading to MPy/Py, MChy/Chy, and the sum of unsubstituted 5-ring/4-ring PAH ratios changes with maturity. The influence of thermal maturation outweighs that of uranium radiation in this study, and maturity varies mainly with depth.</div></div>","PeriodicalId":13864,"journal":{"name":"International Journal of Coal Geology","volume":null,"pages":null},"PeriodicalIF":5.6000,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Coal Geology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0166516224002003","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

Abstract

The middle (Miaolingian) to upper (Furongian) Cambrian Alum Shale Formation in the DBH15/73 core from south-central Sweden was exposed to local heat from a diabase intrusion, providing an opportunity to investigate the molecular geochemical response to thermal stress. Organic petrological observations and biomarker analyses were conducted to study changes in maturity-indicating parameters and the distribution of high molecular weight polycyclic aromatic hydrocarbons (PAHs) during the maturation process. The DBH15/73 samples exhibit a maturity gradient, ranging from immature at the base to mature in the upper part of the Alum Shale Formation. Multiple maturity-based biomarker parameters were analyzed, and Ts/(Ts + Tm), M30/(M30 + H30), and Hopane H32: 22S/(22S + 22R) of saturated hydrocarbon parameters are found to be more reliable. Ratios of alkylnaphthalenes, alkylphenanthrenes, and alkyldibenzothiophenes (MNR, DNR, TMNr, TeMNr, MPI-1, MPR, MDR, and DMDR) also showed consistent correlations with thermal maturity. Thermal maturation impacted the macromolecular structure, resulting in the aromatization and demethylation, leading to MPy/Py, MChy/Chy, and the sum of unsubstituted 5-ring/4-ring PAH ratios changes with maturity. The influence of thermal maturation outweighs that of uranium radiation in this study, and maturity varies mainly with depth.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
热入侵对瑞典中南部矾土页岩生物标志物分布的影响
瑞典中南部的 DBH15/73 岩芯中的寒武纪中(庙岭期)至上古(芙蓉期)矾页岩层暴露在辉绿岩侵入的局部热量下,为研究热应力的分子地球化学响应提供了机会。通过有机岩石学观察和生物标记分析,研究了成熟过程中成熟指示参数的变化以及高分子量多环芳烃(PAHs)的分布情况。DBH15/73 样本呈现出成熟度梯度,从矾土页岩层底部的未成熟到上部的成熟。对多种基于成熟度的生物标志物参数进行了分析,发现饱和烃参数中的Ts/(Ts + Tm)、M30/(M30 + H30)和Hopane H32:22S/(22S + 22R)比较可靠。烷基萘、烷基菲和烷基二苯并噻吩的比率(MNR、DNR、TMNr、TeMNr、MPI-1、MPR、MDR 和 DMDR)也显示出与热成熟度一致的相关性。热成熟影响了大分子结构,导致芳香化和去甲基化,从而使 MPy/Py、MChy/Chy 和未取代的 5 环/4 环多环芳烃比率总和随成熟度而变化。在本研究中,热成熟的影响大于铀辐射的影响,成熟度主要随深度而变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
期刊最新文献
Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden Disentangling causes of the limestone-marl bedding couplets in the Bridge Creek Limestone Member of the Greenhorn Formation through an integrated sedimentological and organic petrology analysis Tungsten (W) geochemistry in north Asian coals (Siberia, Russian far east and Kazakhstan) Editorial Board Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1