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
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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.

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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。
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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.
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