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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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.