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首页» 过刊浏览» 2022» Vol.7» Issue(3) 321-333     DOI : 10.3969/j.issn.2096-1693.2022.03.029
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岩石热导率影响因素实验研究及其对地热资源评估的启示
朱传庆,陈驰,杨亚波,邱楠生
1 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249 2 中国石油大学(北京)地球科学学院,北京 102249 3 中国地质调查局广州海洋地质调查局,广州 510075
Experimental study into the factors influencing rock thermal conductivity and their significance to geothermal resource assessment
ZHU Chuanqing, CHEN Chi, YANG Yabo, QIU Nansheng
1 College of Geoscience, China University of Petroleum-Beijing, Beijing 102249, China 2 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China 3 Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, China

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摘要  热导率对深部温度分布具有重要影响,地层垂向热导率差异会造成 “热折射”现象,指示了低热导率盖层对地热资源聚集的作用。在我 国一些中新生代沉积盆地中,低热传导的砂泥岩层组合覆盖在高热传 导的碳酸盐岩或基底结晶岩之上,形成具有明显热导率差异的良好 储、盖组合,对于地热资源富集意义重大。
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关键词 : 热导率;密度;孔隙度;岩性;各向异性
Abstract

China’s ‘Double Carbon’ policy (carbon peaking and carbon neutrality goals), means geothermal energy, as a clean renewable energy, has gradually received attention in the energy domain. The thermal conductivity of rock plays an important role in studying the geothermal field and evaluating the amount of geothermal resources, as heat conduction is the main way that the Earth conveys heat to the outside. In order to quantitatively understand the thermal conductivity of rock and the factors influencing it, the thermal conductivity of 135 rock samples were measured by the transient plate heat source method (TPS) and the porosity, density and mineral composition of some selected samples were also measured to provide a dataset for the understanding on the influencing factors of rock thermal conductivity. The results show that the thermal conductivity of volcanic rocks is the lowest, the thermal conductivity of clastic rocks is close to that of intrusive rocks, and the average thermal conductivity of carbonate rocks is the highest, with the thermal conductivity of intrusive rocks, volcanic rocks, clastic rocks and carbonate rocks ranging from 1.62 to 4.00 W/m·K, 1.09 to 2.07 W/m·K, 1.52 to 5.23W/m·K, and 2.34 to 6.55W/m·K respectively. The average thermal conductivity of the four types of rock samples is 2.54±0.53 W/m·K, 1.50±0.24 W/m·K, 2.77±0.83 W/m·K and 4.21±1.28 W/m·K, respectively. There is a close relationship between thermal conductivity and rock fabric. Thermal conductivity of the rock-forming minerals is an important factor affecting rock thermal conductivity. Quartz, the typical mineral with a high thermal conductivity can obviously affect the thermal conductivity of intrusive rocks and clastic rocks, and dolomite content obviously affects the thermal conductivity of carbonate rocks. The thermal conductivity of clastic rocks is negatively correlated with porosity, it decreases with an increase of porosity in a larger porosity range, but the trend is not obvious when the porosity is relatively low. There is a positive correlation between rock thermal conductivity and density. The anisotropy of thermal conductivity is mainly caused by the stratified structure of rocks, that is, there is basically no anisotropy in the thermal conductivity of massive intrusive rocks. The anisotropy coefficients of stratified rocks range from 1.08 to 2.08. A low thermal conductivity cap plays an important role in the accumulation of geothermal resources, which makes the heat from depth accumulate at the bottom of the cap and the top of the basement, resulting in higher temperature distribution in the upper part of the geothermal reservoir. The results provide a reference for understanding the influence of rock fabric on thermal conductivity, the modeling of rock thermophysical parameters in a deep temperature field and geothermal resource evaluation.

Key words: thermal conductivity; density; porosity; lithology; anisotropy
收稿日期: 2022-09-29     
PACS:    
基金资助:国家自然科学基金“渤海湾盆地挽近时期构造- 热演化与有效热源机制”(42172334) 和国家重点研发计划课题“中国东部挽近时期热体制
与深层高温地热聚集模式”(2021YFA0716003) 资助
通讯作者: zhucq@cup.edu.cn
引用本文:   
朱传庆, 陈驰, 杨亚波, 邱楠生. 岩石热导率影响因素实验研究及其对地热资源评估的启示. 石油科学通报, 2022, 03: 321-333
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