新疆天山帶地下流體觀測點水文地質(zhì)環(huán)境評價與研究
[Abstract]:In the observation of seismic underground fluid, the characteristics of groundwater recharge sources, circulation and evolution are the basic basis for analyzing the precursory information of underground fluid. At present, in the study of groundwater recharge, circulation and evolution, the methods of hydrochemistry, environmental isotopes and groundwater dating have become more and more effective researchers. The study and evaluation of the hydrogeological environment of underground fluid observation points are carried out by these methods. The source of groundwater recharge and the characteristics of cyclic evolution are discussed, and the important reference and basic information will be provided for the analysis of the precursory information of the seismic underground fluid. On the other hand, the earthquakes in the Tianshan seismic belt in Xinjiang are frequent and earthquake in recent years. High activity, reasonable distribution of underground fluid observation points, abundant precursory information and a natural test field for seismic underground fluid monitoring. The evaluation and study of the hydrogeological environment of underground fluid observation points in Tianshan seismic belt, and further analysis and evaluation of the precursory information of underground fluid can be used for the future of this area and other observation points. In this paper, the hydrochemical types of groundwater, the characteristics of water rock chemical equilibrium, the temperature and depth of groundwater, the supply and the elevation of recharge, and the calculation of the age of groundwater by radioactive isotopic tritium are emphatically analyzed in this paper. (1) (1) the chemical types of the spring water in Urumqi are similar, the recharge height and the actual elevation are relatively small, and the runoff time and distance are short after recharge, and some are direct recharge of the atmospheric precipitation, which belong to shallow groundwater, and the content of SO42- ions in well and 4 springs is higher, and the water rock chemical equilibrium state is "partially balanced water" and groundwater. A part of the deep water is mixed and the circulation depth is large; the No. 15 spring water chemical type is complex, the water rock reaction is more fully, the supply elevation is lower than the actual elevation, the precipitation is recharged to the underground at the lower altitude, and the groundwater is recharged through underground circulation. (2) the No. 21 spring is caused by the surface water breakdown, circulation and excretion. After recharge of precipitation and surface water, the spring water is formed after a certain depth of circulation. (3) the 501 springs and 39 springs are type Na-Ca-SO4-Cl water, the water rock reaction is in the primary stage, the depth of the groundwater circulation is large, and the spring water is excreted after a certain depth of circulation after the water and surface water is supplemental. (4 In the North Tianshan Sha Wan, in the seismic fluid monitoring points of Wusu and bole, the collected water samples are mixed with different degrees of deep water, the depth of the groundwater circulation is larger, the runoff path is longer and the age of the groundwater is more than 500 years. (5) the formation mechanism of the fault springs in Nilka and Turks is similar, all of which are after the recharge of atmospheric precipitation and ice snow water, The evidence of (6) age of tritium indicates that the monitoring points are mostly "sub modern" groundwater, which is suitable for monitoring the seismic information of the chemical components of groundwater. In order to better apply the above methods and theories to concrete work, the fourth chapter takes the No. 10 spring as an example, and combines the day with the day. The monitoring data of the monitoring point have been analyzed and evaluated. It is considered that the monitoring data of the 10 spring is stable, the regularity is good, the groundwater is mixed, the degree of water one rock reaction and the age of groundwater are moderate, it is more suitable to carry out the precursory observation of the earthquake underground fluid, and it is easier to obtain the anomaly information of the earthquake precursors at various stages. The study on the hydrogeological environment of the lower fluid monitoring points will help to promote the application of hydrochemistry, environmental isotopes and groundwater dating in the field of seismic monitoring, especially the technology of groundwater dating, although its application in the research of seismic underground fluid science is still less, but according to the examples of related disciplines, this technique is used. There should be a wide range of prospects for application.
【學(xué)位授予單位】:中國地震局地殼應(yīng)力研究所
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:P315.723
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