| 济阳坳陷桩西潜山高温地热资源形成机理与勘探选区研究 |
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| 关键词:Jiyang Depression Zhuangxi Buried Hill heat source composition Karst dynamics high-temperature geothermal resources |
| 基金项目:由国家自然科学基金项目(编号: 42572329; 42272288)、山东省地矿局科技攻关与引领示范项目(编号: HJ202213)和山东省地矿工程勘察院科技创新项目(编号: 202407)联合资助。 |
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| Study on the Formation Mechanism and Exploration Target Selection of High-Temperature Geo-thermal Resources in Zhuangxi Buried Hill of Jiyang Depression |
| Previous ultra-deep boreholes have revealed the potential for exploring and developing high-temperature geothermal resources at depths shallower than 4 000 m in the Zhuangxi Buried Hill. This study was based on borehole thermophysical data reflecting deep structural activity, regional heat flow calculations, rock thermophysical parameters, natural seismic fields statistics, and deep karst fracture dynamics. The factors controlling the geothermal reservoirs were analyzed, including regional crust-mantle activity mechanisms, tectonic setting and characteristics, heat source composition, and rock thermophysical parameters. The hot materials from the deep asthenosphere readily upwell along structural weak planes or zones, forming regionally high heat flow, during destruction and thinning of the North China Craton. The combination of rocks with contrasting thermal conductivities led to heat flow accumulation, resulting in substantially higher temperatures within the Zhuangxi Buried Hill uplift than in the surrounding areas. Multiphase compressional and extensional tectonicl features within an extensional setting can lead to the formation of local thermal anomalies via enhancing the convective heat transfer of deep geothermal fluids. This process is facilitated by the vertically compartmentalized spaces created along weakness zones caused by pre-existing faults within brittle rocks and the vertical tensile fractures developed within the brittle-ductile transition zone. The extension and strike-slip movement along the Zhuangnan Fault at the southern boundary of the unit produced two distinct types of water-enriched fractured reservoirs within the fault zone and its footwall carbonate rocks. The thick vertical sedimentary sandstone aquifer in the hanging wall, corresponding to the carbonate sequence, provides regional-scale recharge. Based on the heat accumulation and water conduction mechanisms in the study area,a high-temperature geothermal resource exploration target was identified, with localized and discrete high-temperature anomalies indicating considerable exploration and development potential. |
| YAO Song,LI Changsuo,WEI Shanming,LI Bo,KONG Dexin.2026.Study on the Formation Mechanism and Exploration Target Selection of High-Temperature Geo-thermal Resources in Zhuangxi Buried Hill of Jiyang Depression[J].Acta Geoscientica Sinica,47(1):78-90. |
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