Kerogen kinetics and the effect of rock matrix: Insights from Western Greece

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-08-06 DOI:10.1016/j.coal.2024.104585
Vagia Ioanna Makri , Ioannis Oikonomopoulos , David Muirhead , Nikos Pasadakis
{"title":"Kerogen kinetics and the effect of rock matrix: Insights from Western Greece","authors":"Vagia Ioanna Makri ,&nbsp;Ioannis Oikonomopoulos ,&nbsp;David Muirhead ,&nbsp;Nikos Pasadakis","doi":"10.1016/j.coal.2024.104585","DOIUrl":null,"url":null,"abstract":"<div><p>The importance of kerogen kinetics extends beyond hydrocarbon generation, encompassing thermal modeling, organic matter heterogeneity, and the assessment of thermal decomposition. Our study focuses on analyzing the organic and inorganic signatures of source rock intervals, by integrating also literature maceral compositions, to identify potential correlations between kinetics and the mineral matrix. To achieve this, nineteen samples from proved Mesozoic source rock intervals in Western Greece were analyzed. Rock-Eval 6 pyrolysis experiments identified thermally immature to slightly mature, mainly type II, and mixed I-II kerogens. X-ray fluorescence and X-ray diffraction analysis revealed a predominance of carbonate over silicate minerals, indicating a carbonate-dominated source rock character and predominantly reducing marine depositional conditions. High sulfur contents, primarily observed in the Late Triassic – Early Jurassic interval, suggest euxinic conditions and the presence of II(S) kerogens. Bulk rock kinetic analysis revealed activation energy distributions mainly ranging from 43 to 60 kcal/mol. The Late Triassic – Early Jurassic and Early – Mid Jurassic intervals show greater heterogeneity with broad distributions, while the Mid – Late Jurassic and Early Cretaceous intervals exhibit more homogeneity, with two to three principal activation energy peaks. Kerogen isolation revealed differences in activation energies and frequency factors between the bulk rock and the kerogen, with the mineral matrix potentially having a minimal effect in the reaction rate. This research offers insights into the bulk kinetics of marine source rocks linked with global oceanic anoxic events, with broader implications to the hydrocarbon exploration in the fold and thrust belt of Western Greece, and to analogue geological settings worldwide.</p></div>","PeriodicalId":13864,"journal":{"name":"International Journal of Coal Geology","volume":"292 ","pages":"Article 104585"},"PeriodicalIF":5.6000,"publicationDate":"2024-08-06","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/S0166516224001423","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 importance of kerogen kinetics extends beyond hydrocarbon generation, encompassing thermal modeling, organic matter heterogeneity, and the assessment of thermal decomposition. Our study focuses on analyzing the organic and inorganic signatures of source rock intervals, by integrating also literature maceral compositions, to identify potential correlations between kinetics and the mineral matrix. To achieve this, nineteen samples from proved Mesozoic source rock intervals in Western Greece were analyzed. Rock-Eval 6 pyrolysis experiments identified thermally immature to slightly mature, mainly type II, and mixed I-II kerogens. X-ray fluorescence and X-ray diffraction analysis revealed a predominance of carbonate over silicate minerals, indicating a carbonate-dominated source rock character and predominantly reducing marine depositional conditions. High sulfur contents, primarily observed in the Late Triassic – Early Jurassic interval, suggest euxinic conditions and the presence of II(S) kerogens. Bulk rock kinetic analysis revealed activation energy distributions mainly ranging from 43 to 60 kcal/mol. The Late Triassic – Early Jurassic and Early – Mid Jurassic intervals show greater heterogeneity with broad distributions, while the Mid – Late Jurassic and Early Cretaceous intervals exhibit more homogeneity, with two to three principal activation energy peaks. Kerogen isolation revealed differences in activation energies and frequency factors between the bulk rock and the kerogen, with the mineral matrix potentially having a minimal effect in the reaction rate. This research offers insights into the bulk kinetics of marine source rocks linked with global oceanic anoxic events, with broader implications to the hydrocarbon exploration in the fold and thrust belt of Western Greece, and to analogue geological settings worldwide.

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
岩浆动力学和岩石基质的影响:西希腊的启示
角质层动力学的重要性不仅限于碳氢化合物的生成,还包括热建模、有机物异质性和热分解评估。我们的研究重点是分析源岩层间的有机和无机特征,同时结合文献中的宏观成分,以确定动力学与矿物基质之间的潜在关联。为此,我们分析了来自希腊西部已探明中生代源岩区的 19 个样本。Rock-Eval 6 热解实验确定了热未成熟到轻微成熟的岩浆岩,主要是第二类岩浆岩,以及第一至第二类混合岩浆岩。X 射线荧光和 X 射线衍射分析表明,碳酸盐矿物比硅酸盐矿物多,这表明源岩以碳酸盐为主,沉积条件主要是还原性海相沉积。硫含量较高,主要出现在晚三叠世-早侏罗世区间,这表明了夕阳条件和Ⅱ(S)角质的存在。块岩动力学分析显示,活化能分布主要在 43 至 60 kcal/mol 之间。晚三叠世-早侏罗世和早侏罗世-中侏罗世层段的异质性较大,分布范围较广,而中侏罗世-晚侏罗世和早白垩世层段的异质性较高,有两到三个主要活化能峰。角质分离显示了块岩和角质之间活化能和频率因子的差异,矿物基质对反应速率的影响可能微乎其微。这项研究有助于深入了解与全球大洋缺氧事件有关的海洋源岩的块体动力学,对希腊西部褶皱和推力带的碳氢化合物勘探以及全球类似地质环境具有更广泛的影响。
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
Editorial Board Anomalies in Vicker's microhardness of subbituminous and high volatile bituminous coals Corrigendum to “Characteristics of the low-pressure spatial and temporal distributions of oil- and gas-bearing layers in the Ordos Basin, China” [Int. J. Coal Geol. 2024 (285) 104476]. Deep syntectonic burial of the Anthracite belt, Eastern Pennsylvania Influence of tectonic evolution processes on burial, thermal maturation and gas generation histories of the Wufeng-Longmaxi shale in the Sichuan Basin and adjacent areas
×
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