山西忻定盆地现今地热特征及地热资源赋存条件分析
黄志刚 , 任战利 , 郑庆荣 , 闫肖亚 , 李小英 , 刘白贵 , 勾朝阳 , 孙二虎
现代地质 ›› 2026, Vol. 40 ›› Issue (2) : 441 -452.
山西忻定盆地现今地热特征及地热资源赋存条件分析
Geothermal Regime and Occurrence Condition of Geothermal Resources in Xinding Basin, Shanxi Province
基于忻定盆地钻孔测温、岩石热导率和大地热流值数据,开展地热特征及地热资源赋存条件分析。结果表明,地温场与主控构造密切相关,构造断裂对地温影响较大。断裂附近温度和地温梯度较高。新生代松散沉积层段地温梯度大于4.8 ℃/100 m,高于前寒武系岩段。浅部前寒武系岩段可能受到浅层地热水活动或地表因素影响,地温梯度也较高。深部前寒武系岩段地温梯度较低,平均地温梯度应大于3.0 ℃/100 m。前寒武系岩石热导率2.15 ~ 5.78 W/(m•K),平均值3.67 W/(m•K),有利于形成区域性地热资源。大地热流值介于45.0 ~ 78.8 mW/m2,平均值62.4 mW/m2,高于中国大陆61 ± 15.5 mW/m2和山西裂谷区60.35 mW/m2。盆地构造断裂活动区大地热流值较高。新生代强烈的地壳运动形成北东和北北东向两组主断裂以及一组北西—北西西向隐伏断裂,有利于热流的扩散。地热田热储层为第四系松散岩类孔隙热储层和前寒武系变质岩类裂隙型层状热储层。盖层主要为新生代几百至上千米的细颗粒松散沉积物及部分基岩等不导热地层。在构造断裂活动区地热田以热对流型为主,其他地区以热传导型为主。
Based on the data of borehole temperature measurement, rock thermal conductivity and terrestrial heat flow in Xinding basin, geothermal characteristics and occurrence conditions of geothermal resources are analyzed. The results show that the geothermal field is closely related to the main control structure, and the tectonic fracture has a great influence on the geothermal field.Temperature and geothermal gradient near the fault structure are high. Geothermal gradient value of the Cenozoic loose sedimentary section is greater than 4.8 ℃/100 m, which is higher than that of the Precambrian rock section. The shallow Precambrian rock section may be affected by shallow geothermal water activity or surface factors, and the geothermal gradient is also high. Geothermal gradient of the deep Precambrian rock section is low, and the average geothermal gradient should be greater than 3.0 ℃/100 m. Thermal conductivity of Precambrian rocks is 2.15 - 5.78 W/(m•K), with an average value of 3.67 W/(m•K), which is conducive to the formation of regional geothermal resources. Terrestrial heat flow value is between 45.0 - 78.8 mW/m2, with an average of 62.4 mW/m2, which is higher than 61 ± 15.5 mW/m2 in Chinese mainland and 60.35 mW/m2 in the Shanxi rift. Terrestrial heat flow value is higher in the tectonic fault activity area of the basin. The strong crustal movement in the Cenozoic formed two groups of main faults in the NE and NNE directions and a group of concealed faults in the NW-NWW direction, favorable to the diffusion of heat flow. Geothermal reservoir of geothermal field is loose rock pore of Quaternary and metamorphic rock fracture type layered of Precambrian. Cover is mainly non-thermally conductive strata such as fine-grained loose sediments and some bedrocks in the Cenozoic hundreds to thousands of meters. In the tectonic fault activity area, the geothermal field is dominated by thermal convection type, and other areas are dominated by heat conduction type.
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国家自然科学基金重点项目(41630312)
山西省自然科学基金(201901D111297)
中国石油长庆油田分公司科技重大专项“鄂尔多斯盆地中元古界-奥陶系构造沉积演化、成源机制与勘探新领域”(ZDZX2021)
忻州市科技局基础研究计划(20230514)
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