西藏谷露地热田地热地质特征
Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet
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西藏谷露地热田于2020年成功揭露到189.2 ℃的高温地热资源,研究谷露地热田地热地质特征,对西藏地热资源勘查开发和揭示高温地热系统成因机理都具有重要的科学与指导意义.本文以构造地质调查为基础,结合最新物探、钻探、水文资料,通过解析构造‒水‒热循环系统内在联系,总结构造控热规律,并建立了谷露地热田地热系统概念模型.谷露地热田内主要发育N-S向(F1、F3)、E-W向(F2、F4)和NE向3组断裂.大气降水与冰山融水沿盆地西侧九子拉‒桑雄断裂下渗,经深循环加热以盆地西缘F1断裂为导热通道向上运移,由于受到南北两侧F2、F4断裂的阻隔作用,热水在F1和F3断裂组成的“Y”字型断裂系统内汇聚集中,形成热储,并在地表沿NE向和N-S向断裂构成的通道系统中运移排泄;盆地基底花岗岩之上覆盖的泉胶砾岩层对热储起到了良好的隔水保温作用;热田内第四系沉积很薄,热储主要赋存于基岩裂隙中,为基岩裂隙型热储.F1与F3构成的“Y”字型断裂系统是热储赋存的主要场所,谷露地热田地热资源勘查开发要以这两条断裂为重点勘查目标.
谷露 / 地热田 / 地热发电 / 概念模型 / 基岩裂隙型热储
Gulu / geothermal field / geothermal power generation / conceptual model / bedrock fractured thermal reservoir
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中核集团集中研发项目(中核科发(2019)419号)
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