High-temperature treated oil-rich bedded rock layer and deterioration mechanism of heat transfer performance

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-02-26 DOI:10.1007/s10064-025-04154-w

Yanjun Shen, Ziyi Li, Cheng Peng, Jianshuai Hao

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Abstract

The study of the changes in heat transfer properties of oil-rich bedded rock layer at high temperatures is important for the development of projects such as underground coal gasification, geothermal mining and nuclear plant construction. In this paper, the change characteristics of heat transfer performance of oil-rich bedded rock layer after high-temperature treatment were studied from macro-meso-microscopic perspective by systematic testing means such as thermal parameter test, NMR, XRD and SEM, and the influence law of temperature and heating time on heat transfer performance was grasped, and the deterioration mechanism of heat transfer performance was revealed. The results show that the heat transfer performance of baseboard rock layer undergoes significant deterioration after high-temperature treatment, with the greatest deterioration rate in the temperature interval of 400 ℃-600 ℃ and 500 ℃ as the temperature threshold for rapid deterioration. The content of the main mineral components such as quartz and kaolinite, which affect the density of the geotechnical structure within the specimens, changed significantly, with the percentage of quartz in the mudstone specimens decreasing from 93 to 83% and kaolinite from 5 to 2%. The percentage of quartz in the siltstone decreased from 91 to 82%, and kaolinite decreased from 6 to 1%. This led to a rapid deterioration of the heat transfer properties of baseboard rock layer, with a reduction in thermal conductivity of 47.2% for mudstone and 58.9% for siltstone.

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经高温处理的富油层状岩层及其传热性能劣化机理

研究富油层状岩层在高温下的换热特性变化对煤地下气化、地热开采和核电站建设等工程的开发具有重要意义。本文通过热参数测试、NMR、XRD、SEM等系统测试手段，从宏观细观角度研究了富油层状岩层高温处理后的换热性能变化特征，掌握了温度和加热时间对换热性能的影响规律，揭示了换热性能恶化机理。结果表明：基岩层经高温处理后传热性能发生明显劣化，在400℃~ 600℃区间劣化速率最大，500℃为快速劣化的温度阈值；影响岩样内部岩土结构密度的主要矿物成分石英和高岭石含量变化明显，石英在泥岩样品中的含量从93%下降到83%，高岭石从5%下降到2%。粉砂岩中石英含量由91%下降到82%，高岭石含量由6%下降到1%。这导致基板岩层的传热性能迅速恶化，泥岩和粉砂岩的导热系数分别下降了47.2%和58.9%。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.