本文選題：固市凹陷 + 地下熱水��； 參考：《長(zhǎng)安大學(xué)》2016年碩士論文

【摘要】：同位素水文地球化學(xué)方法在研究地下熱水的起源成因及賦存特征方面具有不可替代的優(yōu)勢(shì)。本文以固市凹陷和渭河斷裂周邊地下熱水為研究對(duì)象,在野外實(shí)地取樣調(diào)查及同位素測(cè)試分析的基礎(chǔ)上,系統(tǒng)的研究了固市凹陷地下熱水特征和渭河斷裂導(dǎo)水機(jī)理。研究成果既可豐富對(duì)地下熱水深循環(huán)理論的認(rèn)識(shí)又為固市凹陷與渭河斷裂相關(guān)的咸陽(yáng)西安關(guān)中城市群帶地?zé)豳Y源開(kāi)發(fā)利用提供科學(xué)依據(jù)。固市凹陷地下熱水的δD和δ18O同位素研究表明:固市凹陷地下熱水在不同次級(jí)構(gòu)造單元具有不同的賦存特征及不同的補(bǔ)給來(lái)源。13C同位素表明地下熱水中HCO3-并非是氣源或幔源成因而是來(lái)自碳酸鹽溶解。δ13C與HCO3-的關(guān)系提示固市凹陷地下熱水賦存封閉程度固市斷凹二華斷階三原斷階。δ34S揭示固市凹陷熱下熱水可能經(jīng)歷了由大氣降水補(bǔ)給的開(kāi)放狀態(tài)到封閉滯留狀態(tài)的過(guò)程。固市凹陷地下熱水水文地球化學(xué)特征研究表明:固市凹陷地下熱水普遍發(fā)生了溶濾、混合、脫碳酸、陽(yáng)離子交替吸附作用,且固市斷凹地下熱水的TDS為固市凹陷之最。同位素及水文地球化學(xué)演化特征揭示,三原斷階地下熱水的補(bǔ)給來(lái)源為北東方向廟山大氣降水,二華斷階地下熱水主要受西南方向少華山古代大氣降水補(bǔ)給,固市斷凹地下熱水是與關(guān)中盆地同時(shí)沉積形成的沉積水或殘存沉積水。渭河斷裂周邊地下熱水在沿?cái)嗔炎呦驈奈鞯綎|水化學(xué)類(lèi)型從SO4-Na型演變?yōu)镾O4-Cl-Na型,TDS逐漸升高,結(jié)合氘氧及鍶同位素表明渭河斷裂在沿?cái)嗔炎呦蛏暇哂忻黠@的導(dǎo)水性。而渭河斷裂南北兩側(cè)地下熱水水化學(xué)類(lèi)型、氘氧同位素富集程度、鍶同位素含量、地下熱水年齡均有較大差異,表明渭河斷裂垂直斷裂走向上水力聯(lián)系不明顯。渭河斷裂周邊地下熱水與附近非斷裂帶地下熱水相比具有更高的溫度和循環(huán)深度,氘氧同位素研究表明斷裂帶地下熱水混入了當(dāng)?shù)爻袎豪渌?說(shuō)明渭河斷裂在鉛垂方向上具有較好的導(dǎo)水性。渭河斷裂對(duì)關(guān)中盆地腹部地下熱水的形成、賦存有重要影響。
[Abstract]:Isotopic hydrogeochemical method has an irreplaceable advantage in studying the origin and occurrence characteristics of geothermal water. On the basis of field sampling and isotopic analysis, the characteristics of underground hot water and the mechanism of water conductivity of Weihe fault in Gushi sag are systematically studied in this paper, taking the geothermal water around Gushi sag and Weihe fault as the research object, and on the basis of field sampling and isotopic analysis. The research results can not only enrich the understanding of the theory of deep circulation of underground hot water, but also provide scientific basis for the exploitation and utilization of geothermal resources in Guanzhong urban agglomeration belt of Xi'an, Xianyang, which is related to Weihe fault. The 未 D and 未 18O isotopic studies of geothermal water in Gushi sag show that the geothermal water in Gushi sag has different occurrence characteristics and different recharge sources in different secondary tectonic units. 13C isotope shows that HCO _ 3- in geothermal water is not gas. The relationship between 未 13C and HCO _ 3- indicates that the geothermal water in Gushi sag is closed. 未 34S reveals that the hot water in Gushi sag may have experienced precipitation from the atmosphere. The process from an open state of recharge to a closed state of detention. The hydrogeochemical characteristics of geothermal water in Gushi sag show that dissolved filtration, mixing, decarbonation, cation alternate adsorption are common in the geothermal water of Gushi depression, and TDs of the geothermal water in Gushi fault depression is the most common in Gushi sag. The characteristics of isotopic and hydrogeochemical evolution reveal that the recharge of underground hot water in Sanyuan fault terrace is from Miaoshan atmospheric precipitation in the north east direction, and the geothermal water in the Erhua fault terrace is mainly recharged by the ancient precipitation in the southwest Shaohua Mountains. Gushi fault depression geothermal water is sedimentary water or residual sedimentary water formed at the same time as Guanzhong basin. The underground hot water along the Weihe fault zone evolved from so _ 4-Na type to so _ 4-Cl-Na type TDs along the fault strike. The combination of deuterium and oxygen and strontium isotope shows that the Weihe fault has obvious conductivity along the fault strike. However, the hydrochemical types, enrichment degree of deuterium and oxygen isotopes, strontium isotopic content and age of underground hot water on the north and south sides of Weihe fault are quite different, which indicates that the vertical strike of Weihe fault has no obvious hydraulic connection. The geothermal water around the Weihe fault has a higher temperature and cycle depth than that in the nearby non-fault zone. Deuterium and oxygen isotopic studies show that the geothermal water in the fault zone is mixed with local confined cold water. It shows that the Weihe fault has good water conductivity in the vertical direction. Weihe fault has an important influence on the formation and occurrence of underground hot water in the central part of Guanzhong Basin.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P314.1;P642.2

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1 李強(qiáng);;山西地下熱水的分布及特征分析[J];山西水利科技;2006年01期

2 許v，

本文編號(hào)：2068974