鲁东招远地热田地热通量及地热成因研究
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本文为山东省重点研发计划项目(编号:2019GSF109053)、山东省自然资源厅地质勘查项目(编号:鲁堪字(2018)42号)和国家自然科学基金资助项目(编号U1906209、42072331、41877192)的成果


Study on geothermal flux and geothermal genesis of Zhaoyuan geothermal field in Eastern Shandong geothermal area
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    摘要:

    鲁东地热区在地质构造单元上位于沂沭断裂带昌邑—大店断裂以东,地热资源丰富。本文采集了鲁东地热区招远地热田内一眼2000m深地热井(DRZK01)中的40块岩芯样品进行岩石热导率、岩石生热率测试及分析,结合测温资料及收集资料对该区地热通量构成及分层热流进行了分析研究;采集区内典型地热流体样品进行水化学分析并采用合适的地热温标估算了该区热储温度;综合研究成果建立了该区地热成因概念模型。研究结果显示,该区岩石热导率数值较高,测量值在2.8~5.7W/(m·K)之间,普遍高于上地壳平均热导率,地温梯度较高,为31.8℃/km;利用热导率和地温梯度计算的地热通量102mW/m2中热传导分量为(73.2±6.18)mW/m2,对流分量为(28.76±6.18)mW/m2,其中热传导分量中地壳热流为22.5mW/m2,地幔热流为(50.74±6.18)mW/m2,二者比值为1:1.98~1:2.52,为“热幔冷壳”型热结构。石英温标计算热储平均温度为128.6℃,热循环深度约3634m。研究结果丰富了该区地热系统理论并为该区地热资源开发利用提供一定的理论支撑。

    Abstract:

    The study area located in Easter Shandong area, which belongs to the northern part of the north Shandong uplift. Methods:In this paper, the thermal conductivity and heat generation rate of rock are measured by testing 40 typical core samples.Combined with temperature measurement data and collected data,the composition of geothermal flux in this area was analyzed and studied.Typical geothermal fluid samples in the area were collected to obtain hydrochemistry data.Results:The measured rock conductivity in this area is from 2.8 to 5.7W/(m·K),which is generally higher than the average thermal conductivity of the upper crust.The geothermal gradient is 31.8alyz.The geothermal flux calculated by thermal conductivity and geothermal gradient is 102 mW/m2,in which the heat conduction component is 73.2±6.18 mW/m2 and the convection component is 28.76±8.76 mW/m2.The ratio of crustal heat flow to mantle heat flow is 1∶1.98~1∶2.52.The calculated average reservoir temperature by quartz thermometer is about 128.6 ℃ and the thermal cycle depth is about 3634m.Conclusions:The geothermal flux in Zhao yuan geothermal field is contributed by both conduction heat and convection heat.The contribution of crustal heat flow is half of mantle heat flow,and the thermal structure of lithosphere belongs to the “hot mantle cold crust” type.The research results enrich the geothermal system theory in this area and provide some theoretical support for the development and utilization of geothermal resources in this area.

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钟振楠,康凤新,宋明忠,郎旭娟,柳禄湧,傅朋远,李志杰.2021.鲁东招远地热田地热通量及地热成因研究[J].地质论评,67(3):828-840,[DOI].
ZHONG Zhennan, KANG Fengxin, SONG Mingzhong, LANG Xujuan, LIU Luyong, FU Pengyuan, LI Zhijie.2021. Study on geothermal flux and geothermal genesis of Zhaoyuan geothermal field in Eastern Shandong geothermal area[J]. Geological Review,67(3):828-840.

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  • 收稿日期:2020-10-29
  • 最后修改日期:2021-02-18
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  • 在线发布日期: 2021-05-19
  • 出版日期: 2021-05-15