| 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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| 引用本文：姚松,李常锁,魏善明,李波,孔德鑫.2026.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[J].地球学报,47(1):78-90. |
| DOI：10.3975/cagsb.2025.101121 |
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| 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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| 中文摘要:以往超深钻孔揭示桩西潜山4 000 m以浅具有高温地热资源勘探开发潜力。本次研究基于钻孔热物理数据针对深部构造活动响应、区域热流计算、岩石热物性测试、天然场地震统计、深部岩溶裂隙动力作用, 分析了区域壳幔活动机理、构造环境与特征、热源组成、岩石热物理参数等控热因素, 认为华北克拉通破坏减薄背景下深部软流圈热物质易沿构造薄弱面或薄弱带上涌形成区域高热流值, 高低差热导率岩石组合形成的热流聚集让桩西潜山凸起的构造温度显著高于周边区域, 多期挤压拉伸构造特征在伸展环境下, 促使脆性岩石沿先期断裂形成的薄弱面重新开放及脆韧地层转换带形成张性断裂, 这些封闭的空间有利于下部热流对流形成局部热异常。桩西潜山南部边界桩南断裂的伸展、走滑环境, 在断裂带内及下盘的碳酸盐岩形成了两类易厘定的储水断裂富水区, 断裂上盘垂向上在碳酸盐岩范围对应的巨厚沉积砂岩含水层可为区域提供补给。基于研究区聚热导水机理, 确定了高温地热资源勘探孔位1处, 认为局部存在多处点状高温勘探区块, 具有良好的勘探开发前景。 |
| 中文关键词:济阳坳陷 桩西潜山 热源组成 岩溶动力作用 高温地热资源 |
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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 |
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| Abstract: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. |
| keywords:Jiyang Depression Zhuangxi Buried Hill heat source composition Karst dynamics high-temperature geothermal resources |
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