卢丽莉^1,,
陈顺云¹,
刘琼颖^1,,,
闫玮²,
刘培洵¹,
宋春燕²,
冯嘉辉¹,
陈立春^3,1
1. 中国地震局地质研究所, 地震动力学国家重点实验室, 新疆帕米尔陆内俯冲国家野外科学观测研究站, 北京 100029
2. 新疆维吾尔自治区地震局, 乌鲁木齐 830011
3. 桂林理工大学, 桂林 541006

基金项目: 国家重点研发计划（2018YFC1503304），中央级公益性科研院所基本科研业务专项（IGCEA1815，IGCEA1910）和国家自然科学基金面上项目（41474162）共同资助


详细信息

作者简介: 卢丽莉, 女, 1997年生, 硕士生, 构造地质学专业.E-mail: lulili0122@163.com

通讯作者: 刘琼颖, 女, 1988年生, 副研究员, 主要从事地温观测与流体运移特征分析、盆地构造-热演化、岩石圈热结构等方面研究.E-mail: liuqiongying@ies.ac.cn

中图分类号: P541;P314

收稿日期:2021-02-10
修回日期:2021-07-05
上线日期:2021-12-10

Determining groundwater movement from bedrock temperature: A case study of Kashi area

LU LiLi^1,,
CHEN ShunYun¹,
LIU QiongYing^1,,,
YAN Wei²,
LIU PeiXun¹,
SONG ChunYan²,
FENG JiaHui¹,
CHEN LiChun^3,1
1. Xinjiang Pamir Intracontinental Subduction National Field Scientific Observation and Research Station, Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
3. Guilin University of Technology, Guilin 541006, China


More Information

Corresponding author: LIU QiongYing,E-mail:liuqiongying@ies.ac.cn

MSC: P541;P314

--> Received Date: 10 February 2021
Revised Date: 05 July 2021
Available Online: 10 December 2021


摘要
摘要:流体运移时携带热量，会产生温度变化.温度作为地下流体的示踪剂得到了广泛应用，但通常需要事先确定热扩散系数.实际上，基于浅层地壳不同深度的周期性温度-时间序列，利用流体运动对振幅和相位的影响，可以同步获取热扩散系数和地下流体运移信息.本文以新疆喀什地区5个钻孔不同深度的基岩温度数据为基础，获取了热扩散系数和流体运移特征.主要成果有：（1）获得了不同测点的热扩散系数α，以及视热扩散系α_A和α_Φ（即单独通过振幅或相位获得的热扩散系数）.其中，α、α_A和α_Φ的值分别为1.52~8.91、0.79~1.71和（1.53~33.1）×10^-6 m²·s^-1.另外，当流体热效应不明显时，通过相位获得的视热扩散系α_Φ更接近真实的热扩散系数α.（2）获得了不同测点的流体流向和流速信息.测点的流体流向均向上，靠近天山地区的测点流体流速为（0.10~1.94）×10^-7 m·s^-1，靠近昆仑山地区的测点流体流速为（8.56~9.71）×10^-7 m·s^-1，不同地区测点流体流速的差异可能与区域水文地质环境有关.总之，通过多深度的连续基岩温度观测，有望获得浅层地壳的热扩散系数及流体运移特征.
关键词: 温度-时间序列/
热扩散系数/
地下流体示踪/
喀什-乌恰交汇区

Abstract:When fluid flows, it carries heat, which causes temperature changes. Temperature has been widely used as a tracer of underground fluid, however, it is usually necessary to determine the thermal diffusivity in advance. In fact, based on the periodic temperature-time series of different depths in the shallow crust, the effects of fluid flow on amplitude and phase can be used to simultaneously estimate thermal diffusivity and migration information of underground fluid. Based on observation data of bedrock temperature at different depths of 5 boreholes in Kashi, Xinjiang, thermal diffusivity and migration characteristics of fluid are simultaneously estimated in this paper. And the main results obtained are as follows: (1)Thermal diffusivity α, and the apparent thermal diffusivity α_A and α_Φ (that is, the thermal diffusivity deduced by the amplitude and phase alone)of different measurement stations are obtained. The values of α, α_A and α_Φ are 1.52~8.91, 0.79~1.71 and (1.53~33.1)×10^-6 m²·s^-1.In addition, when the thermal effect generated by fluid migration is not obvious, the apparent thermal diffusivity obtained from the phase is closer to the true thermal diffusivity.(2)We estimate velocity and direction of underground fluid flow at different measurement stations. The flow direction of fluid in the measurement station area is all upward, the fluid velocity of the measurement stations near Tianshan area ranges from 0.10×10^-7 to 1.94×10^-7 m·s^-1, and the fluid velocity of the measurement stations near Kunlun Mountain area various from 8.56×10^-7 to 9.71×10^-7 m·s^-1. The difference among the estimated fluid velocities at different measurement stations in different regions may be related to the hydrogeological environment. In sum, it is expected that the thermal diffusivity and fluid migration characteristics of the shallow crust can be estimated simultaneously from continuous bedrock temperature observations at multiple depths.
Key words:Temperature-time series/
Thermal diffusivity/
Groundwater tracer/
Kashi-Wuqia confluence area



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