银川盆地地热水成因机制：来自水化学和同位素的约束

曹园园; 虎新军; 倪萍; 蒋龙; 王利伟; 杨静; 陈晓晶; 于朝阳; 尚建波; 刘明亮

doi:10.19509/j.cnki.dzkq.tb20250032

银川盆地地热水成因机制：来自水化学和同位素的约束

doi: 10.19509/j.cnki.dzkq.tb20250032

曹园园^{1, 2,},
虎新军²,
倪萍^2, ,,
蒋龙³,
王利伟³,
杨静²,
陈晓晶²,
于朝阳²,
尚建波⁴,
刘明亮⁴

1.
中国地质大学（北京）地球科学与资源学院，北京 100083
2.
宁夏回族自治区地球物理地球化学调查院（自治区深地探测中心），银川 750001
3.
中国冶金地质总局西北局五队，甘肃张掖 734000
4.
长江大学资源与环境学院，武汉 430100

基金项目: 宁夏回族自治区重点研发计划项目“银川盆地东缘地热资源水文地球化学探测技术应用研究”（2022BEG03060）

详细信息

作者简介:
曹园园：E-mail：baiheyueeryuan1@163.com

通讯作者:
E-mail：1501758537@qq.com

中图分类号: P314
计量
- 文章访问数: 47
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2025-01-15
- 录用日期: 2025-06-20
- 修回日期: 2025-06-17
- 网络出版日期: 2025-06-20

Genesis mechanism of geothermal water in Yinchuan Basin: Constraints from hydrochemistry and isotopes

1.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
2.
Geophysical and Geochemical Exploration Institute of Ningxia Hui Autonomous Region (Autonomous Region Deep Earth Exploration Center), Yinchuan 750001, China
3.
Team 5 of the Northwest Bureau of China Metallurgical Geology Bureau, Zhangye Gansu 734000, China
4.
College of Resources and Environment, Yangtze University, Wuhan 430100, China

More Information

Author Bio:
E-mail：baiheyueeryuan1@163.com

Corresponding author: E-mail：1501758537@qq.com

摘要

摘要:
地热资源具备可再生、能源利用效率高和节能减排等显著优势，是推动能源转型、实现 “双碳” 目标的重要可再生能源类型。银川盆地地热储量丰富，但因缺乏系统的水文地球化学与同位素研究，其地热水成因机制尚未明确，开发利用也缺乏科学规划与统一管理，不仅导致地热资源开发利用进程缓慢，还严重阻碍了当地经济的绿色快速发展。本研究以银川盆地典型地热井水样为研究对象，将其按区域划分为西部、中部和东部3组，同步采集研究区深层地下冷水样品作为对照，结合区域地质构造背景，通过系统分析测试地热水与地下冷水的水化学、同位素特征，深入探讨了研究区地热水的地球化学起源、径流循环过程、热源类型，并全面剖析了地热系统的成因机制。研究发现，该区域地热水化学类型主要为 Cl-Na 型和Cl·SO₄-Na 型；氢氧同位素特征显示，地热水补给来源以大气降水为主，补给高程在 1616～2964 m；水化学特征结合氯、锶、硫同位素指示，地热水物质来源主要为高温条件下的水−岩相互作用、岩盐溶解及古沉积水输入。研究区地热水热储温度为 78.9～109.2 ℃，循环深度在 3455.4～24794.0 m；离子比例系数和¹⁴C 测年结果表明，与西部、东部地热水相比，中部地热水的水化学组分含量最高，循环周期最长，循环深度也最深。通过地热水水化学特征分析及花岗岩生热率定量计算得出，研究区地热系统的热源主要为大地热流加热。本研究明确了银川盆地地热资源的关键水文地球化学特征与成因机制，建立了地热系统成因概念模型，为后续科学合理开发利用该地热资源、推动当地经济绿色高质量发展提供了重要的理论与实践依据。
- 银川盆地 /
- 地热水 /
- 水化学 /
- 同位素 /
- 成因机制 /
- 热储特征 /
- 大地热流
Abstract:
Objective
Geothermal resources have advantages such as renewability, high energy utilization efficiency, and energy conservation and emission reduction. As an important renewable energy for promoting energy transition and achieving the "double carbon" goals, although the Yinchuan Basin is rich in geothermal reserves, the genesis of its geothermal water remains unclear due to the lack of systematic hydrogeochemical and isotopic research, and their development lacks scientific planning and unified management, which not only slows down the development process of geothermal resources but also seriously hinders the green rapid local economic development.
Methods
This study focused on water samples from typical geothermal wells in the Yinchuan Basin and divided them into western, central, and eastern regions according to their locations. Combined with the regional geological structure background, by analyzing and testing the hydrochemical and isotopic characteristics of geothermal water and cold groundwater, the study investigated the geochemical origin, runoff circulation processes, and heat sources of geothermal water in the study area, and analyzed the genesis mechanism of the geothermal system.
Results
The results showed that the main hydrochemical types of geothermal water in this study area were Cl-Na type and Cl·SO₄-Na type. Hydrogen and oxygen isotopes indicated that the geothermal water was mainly recharged by atmospheric precipitation, and the recharge elevation ranged from 1616 m to 2964 m. Hydrochemical characteristics, combined with chlorine, strontium, and sulfur isotopes indicated that the material sources of geothermal water were mainly high-temperature conditions of water-rock interaction, rock salt dissolution, and the input of paleo-sedimentary water. Reservoir temperatures in the study area ranged from 78.9 °C to 109.2 °C, and the circulation depths of geothermal water ranged from 3455.4 m to 24794.0 m. The results of ion ratio coefficients and ¹⁴C dating showed that geothermal water in the central region had the highest hydrochemical component contents, the longest circulation period, and the greatest circulation depth compared with the western and eastern regions. Based on geothermal water hydrochemical characteristic analysis and quantitative calculation of granite heat production rates, it was calculated that the heat source of the geothermal system in the study area was mainly terrestrial heat flow, excluding magmatic heating and radioactive element decay heating.
Conclusion
This study clarifies the key hydrogeochemical characteristics and genesis mechanism of geothermal resources in the Yinchuan Basin, and establishes a conceptual model of the geothermal system genesis, providing an important theoretical and practical basis for the subsequent scientific and rational development and utilization of geothermal resources and promoting green high-quality economic development in the region.
- Yinchuan Basin /
- geothermal water /
- hydrochemistry /
- isotope /
- genetic mechanism /
- geothermal reservoir characteristic /
- terrestrial heat flow

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图 1 研究区区域地质图

Figure 1. Regional geological map in the study area

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图 2 研究区水样Piper三线图

Figure 2. Piper trilinear diagram of water samples from study area

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图 3 研究区水样宏量元素含量箱线图

Figure 3. Box plot of major element contents of water samples in the study area

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图 4 研究区地热水、地下冷水氢氧同位素分布图

Figure 4. Distribution of hydrogen and oxygen isotopes of geothermal water and cold groundwater in the study area

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图 5 研究区水样γ(Cl)与γ(Na)关系(a)，c(Na/Cl)与ρ(TDS)关系(b)

Figure 5. Relationship between γ(Cl) and γ(Na) (a) and between c(Na/Cl) and ρ(TDS) (b) of water samples in the study area

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图 6 研究区地热水氯同位素分布图

Figure 6. Distribution of chlorine isotopes of geothermal water in the study area

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图 7 研究区水样γ(Ca²⁺)与γ(HCO₃⁻)关系(a)，γ(Mg²⁺/Ca²⁺)与γ(Na⁺/Ca²⁺)关系(b)

Figure 7. Relationship between γ(Ca²⁺) and γ(HCO₃⁻) (a) and between γ(Mg²⁺/Ca²⁺) and γ(Na⁺/Ca²⁺) (b) of water samples in the study area

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图 8 研究区地热水锶、硫同位素分布图

Figure 8. Distribution of strontium and sulfur isotopes of geothermal water in the study area

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图 9 ρ(HCO₃⁻)/ρ(Cl⁻)与c(Cl⁻)关系图

Figure 9. Relationship between ρ(HCO₃⁻)/ρ(Cl⁻) and c(Cl⁻)

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图 10 研究区地热水Na-K-Mg三角图

Figure 10. Na-K-Mg ternary diagram of geothermal water in the study area

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图 11 银川盆地地热系统成因概念模型图

Figure 11. Conceptual model of geothermal system genesis in Yinchuan Basin

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表 1 研究区水样水化学组分

Table 1. Hydrochemical components of water samples from study area

样品编号	采样地点	采样深度/m	碱度/(mg·L⁻¹)	pH值	T/℃	TDS	CO₃	HCO₃	Cl	SO₄	Ca	K	Mg	Na	Si	B	Li	Sr	Fe	电荷平衡/%
样品编号	采样地点	采样深度/m	碱度/(mg·L⁻¹)	pH值	T/℃	ρ_B/(mg·L⁻¹)												ρ_B/(μg·L⁻¹)		电荷平衡/%
SWQ	银川市兴庆区	/	168.40	7.50	55.20	5348.00	0.72	158.09	2568.06	2658.55	592.87	24.43	78.21	2591.77	21.35	20252.67	693.45	12575.65	918.67	7.60
TLCF	贺兰县	/	97.90	7.10	59.10	13630.00	0.23	82.72	11804.08	6209.23	1989.25	67.04	308.90	6454.76	26.29	9860.99	722.66	36021.21	989.11	−7.20
TLJN	永宁县	/	178.70	7.60	36.60	6106.00	1.00	175.36	3296.93	2631.03	830.40	16.91	375.75	2703.27	15.97	1824.54	170.44	14492.78	570.21	13.30
TMWQ	银川市西夏区	/	213.60	8.00	50.00	850.00	2.55	240.83	478.32	109.66	27.77	6.80	3.09	408.47	27.45	2261.68	76.81	377.15	148.94	−1.60
TSHSJ	银川市兴庆区	/	296.90	7.20	36.50	3848.00	0.65	322.52	2128.24	1789.36	585.62	88.33	101.07	1615.53	13.83	9057.06	1638.01	11641.13	1374.29	3.80
Y1*	银川市兴庆区	/	−	7.00	67.50	16378.00	0.36	172.28	7941.00	2145.40	869.33	66.84	164.42	4860.00	26.46	101000.00	1140.00	46400.00	−	−0.30
Y3*	银川市西夏区	/	−	7.60	55.00	15543.00	1.19	157.19	8129.00	1718.00	946.90	45.20	263.90	4292.00	18.48	31040.00	1327.50	33000.00	−	−2.20
CG01	银川市兴庆区	100	255.30	8.60	12.00	367.00	5.59	276.62	86.10	113.54	66.88	2.45	44.62	86.28	1.70	234.68	11.81	1254.74	160.46	4.60
CG02	银川市西夏区	100	109.80	9.60	15.00	152.00	14.32	89.10	37.94	21.27	10.90	3.44	14.13	43.83	<0	57.38	8.72	139.29	23.01	−1.00
CG03	中国外运门口	100	195.09	8.58	15.50	269.30	4.08	212.85	44.48	115.94	52.66	4.68	40.75	43.67	3.24	141.23	13.53	649.75	141.25	2.70
CG04	望远镇	100	199.06	8.85	15.40	469.30	7.77	213.02	222.93	56.09	19.88	5.61	22.18	195.86	<0	309.11	14.39	509.09	37.80	0.30
CG05	银川高速公路旁	100	281.73	9.61	13.50	628.00	44.87	207.44	174.93	441.23	22.09	1.53	21.24	291.49	3.26	949.59	7.83	392.88	58.75	−12.90
CG06	贺兰县	250	250.60	9.40	13.00	434.00	24.93	215.53	112.49	120.43	31.57	13.22	24.40	156.14	3.91	329.94	7.71	633.20	100.58	−0.20
CG07	贺兰县和平村村部门口	240	160.97	8.30	15.10	1215.00	2.08	174.78	621.17	320.92	87.19	4.58	111.15	329.58	<0	502.61	25.32	1162.94	193.34	1.10
CG08	永宁未仝村团支部对面	240	320.75	9.55	14.00	428.50	45.30	256.61	74.56	137.65	20.25	2.31	13.91	202.53	4.15	378.98	8.50	325.12	52.64	−1.70
CG09	永宁古光村	240	766.49	9.35	15.70	1948.00	82.08	550.65	692.92	581.03	7.70	10.98	174.32	878.28	<0	2086.33	99.77	53.76	123.00	7.10
CG10	金沙乡元亘金沙园西	240	200.38	9.41	15.50	279.00	21.90	174.76	47.84	72.08	17.21	9.08	14.67	104.38	1.92	316.63	8.63	312.44	37.35	−0.20
CG11	西夏区马场路	250	169.09	9.23	17.50	175.40	12.66	146.38	20.06	50.73	44.38	4.02	28.09	44.99	4.62	87.28	10.73	439.47	128.12	13.70
CG12	宁夏中房东方悦	150	364.40	9.10	13.50	744.10	24.65	360.32	237.62	430.85	24.09	3.94	34.36	350.92	<0	232.07	14.29	629.10	24.51	−9.10
CG13	兰星村村委会	250	183.19	9.29	14.90	1089.00	16.29	135.58	626.52	815.54	67.49	12.60	129.55	346.37	<0	557.88	26.27	1624.99	121.21	−14.80
CG14	贺兰县	250	173.30	10.00	15.00	907.00	42.56	68.37	549.20	451.48	31.78	5.73	27.97	414.92	<0	610.93	37.91	941.08	104.57	−12.90
ZK01	平罗县	250	214.95	10.10	13.60	1541.00	55.98	75.83	732.40	330.73	28.87	3.81	27.07	789.11	1.56	927.48	51.08	1005.61	128.35	9.00
ZK02	平罗县	250	61.67	9.96	11.70	2132.00	7.00	12.49	1123.09	485.45	227.45	18.00	190.38	783.09	1.04	841.07	49.69	5633.25	118.47	14.50
ZK03	平罗县	250	199.30	9.29	11.60	1262.00	16.81	159.50	546.51	300.68	58.81	8.03	80.24	513.08	0.78	723.07	38.11	1692.96	133.01	11.80
ZK04	平罗县	160	261.00	9.30	11.60	317.00	21.88	253.83	48.01	43.08	14.05	1.22	7.61	152.98	3.53	541.89	11.21	285.98	123.77	2.70
ZK05	平罗县	250	293.59	10.07	8.90	1126.00	75.10	132.97	420.59	222.27	22.00	2.49	24.06	516.24	1.46	878.69	32.65	641.43	52.13	6.30
ZK06	平罗县	250	171.20	9.60	18.50	1924.00	25.42	100.64	893.08	476.47	52.17	4.68	43.00	970.94	1.53	1114.41	75.62	1553.55	72.94	11.40
ZK07	惠农区	250	72.84	9.69	13.30	1166.00	9.47	34.32	548.02	336.65	95.09	4.59	69.60	439.07	1.13	547.36	82.59	2165.06	156.76	10.60
ZK08	惠农区	250	72.84	8.28	10.40	11100.00	1.07	65.47	6576.67	3267.09	472.38	20.52	511.15	5556.07	5.94	3976.13	397.32	8002.46	1960.34	9.60
ZK09	平罗县	240	126.63	9.00	8.10	2885.00	6.20	106.79	1526.61	853.82	198.24	6.62	160.14	1200.10	2.31	1254.11	74.59	4898.76	132.38	8.90
ZK10	平罗县	240	48.26	9.57	11.20	3268.00	3.85	15.70	1590.28	1304.10	353.54	5.37	101.48	1457.32	1.87	3524.32	131.85	9685.88	115.78	10.80
ZK11	惠农区	240	963.46	9.74	11.80	10270.00	183.58	371.65	5151.30	5444.20	14.78	12.56	210.16	6746.64	5.38	4634.71	133.69	352.47	176.41	5.90
ZK12	惠农区	240	61.67	8.98	12.20	10310.00	2.89	33.91	6058.80	3435.50	404.22	22.03	559.49	5298.26	4.95	3388.27	217.81	7120.08	170.12	10.20
ZK13	平罗县	250	362.86	9.92	8.80	884.90	82.52	215.83	304.01	122.48	16.56	1.70	12.56	398.15	2.53	983.07	20.84	418.64	60.41	1.90
ZK14	平罗县	240	237.74	9.25	12.80	638.10	20.04	229.02	229.42	97.31	18.34	1.07	4.40	305.66	3.82	696.88	10.59	307.48	225.99	4.50
ZK15	平罗县	220	193.05	9.39	13.50	188.20	18.73	173.20	16.30	5.56	26.05	1.01	6.32	60.04	1.97	129.89	3.99	366.48	93.84	−0.30
ZK16	平罗县	230	139.42	8.67	13.30	162.60	3.16	154.81	24.89	15.21	33.58	1.68	10.43	32.74	3.02	74.29	6.43	359.91	158.58	2.90
ZK17	平罗县	230	143.45	8.64	14.00	170.10	3.11	160.77	16.78	6.42	26.44	1.90	11.81	33.81	2.22	74.84	7.49	312.45	73.26	4.00
ZK18	大武口区	240	156.85	9.41	9.70	159.10	14.63	146.46	17.40	3.75	18.97	0.58	4.22	53.64	2.37	81.49	5.37	282.74	45.68	0.10
ZK19	大武口区	240	205.10	9.60	12.70	326.00	30.63	166.24	102.98	20.15	13.85	1.28	3.61	148.73	2.43	192.09	10.16	310.46	91.29	0.40
ZK20	惠农区	190	122.00	9.26	13.40	399.20	9.90	113.17	103.55	154.92	6.43	4.46	35.54	143.01	0.47	258.96	51.23	39.03	66.38	5.10
ZK21	惠农区	230	141.66	9.42	13.20	945.00	14.96	105.68	363.93	299.67	9.09	9.40	92.80	322.54	0.81	481.94	117.86	27.46	177.88	7.20
ZK22	贺兰县	230	126.91	9.14	10.70	155.60	7.10	129.30	16.83	1.97	20.33	1.39	9.58	36.58	1.58	69.19	6.11	279.52	66.27	6.60
ZK23	贺兰县	240	155.51	9.37	11.70	138.00	13.66	141.38	9.55	1.05	24.07	1.05	10.38	35.52	3.21	70.69	4.95	273.12	111.09	3.60
ZK24	西夏区	260	281.98	8.80	12.60	756.70	9.51	288.00	179.67	324.83	64.04	6.88	78.21	240.14	2.72	374.89	34.98	959.05	133.40	8.00
ZK25	金凤区	250	294.94	9.54	12.90	511.60	39.94	240.83	125.94	57.79	17.49	1.66	12.92	211.01	3.83	333.74	17.27	376.61	112.52	1.70
ZK26	利通区	260	60.60	9.70	11.10	6898.00	5.51	12.99	4047.12	2413.66	352.25	22.41	461.34	3345.89	2.97	2857.64	276.28	7886.15	136.47	10.50
ZK27	灵武市	240	283.76	10.13	12.20	358.30	79.39	129.12	88.46	18.27	13.68	2.51	12.17	157.32	1.33	554.29	12.62	335.22	136.02	0.30
ZK28	灵武市	250	42.90	9.61	14.90	2221.00	3.92	14.29	1134.34	688.00	206.05	7.61	194.72	774.67	1.16	1142.63	35.19	2743.60	140.79	13.00
ZK29	青铜峡市	210	105.91	8.96	15.50	804.40	5.02	97.60	334.33	241.72	84.91	5.61	64.02	242.43	0.88	302.88	22.04	1512.35	110.56	10.50
ZK30	兴庆区	210	128.70	9.40	13.50	1410.00	13.60	93.78	691.03	322.81	39.64	6.74	82.56	567.18	0.55	282.87	27.65	855.77	60.94	7.80
ZK31	贺兰县	280	42.90	9.50	12.10	3153.00	2.93	13.26	1947.54	1063.18	639.76	6.45	318.96	868.34	1.99	428.43	57.04	10518.47	196.65	11.60
ZK32	金凤区	130	242.20	9.34	10.60	408.60	20.58	211.13	71.17	91.77	29.39	2.78	41.87	120.77	1.30	381.88	17.13	601.34	66.88	8.50
ZK33	西夏区	230	154.15	8.86	13.00	345.00	5.39	158.18	84.50	73.19	43.65	4.02	41.54	69.04	3.22	153.45	16.38	425.65	193.20	10.50
ZK34	金凤区	270	73.29	9.53	13.40	138.10	8.72	61.93	10.31	16.21	14.05	6.72	4.51	21.16	0.72	92.49	12.53	151.88	42.08	2.20
ZK35	灵武市	230	67.48	9.75	12.00	4683.00	7.23	17.51	2745.64	1750.05	253.97	8.53	300.33	2020.51	2.94	2334.59	92.00	4916.06	368.91	4.70
ZK36	灵武市	200	69.27	9.44	13.30	5135.00	6.03	28.12	2754.88	1684.02	170.62	8.98	399.44	2505.68	3.21	2349.08	82.17	2851.23	159.01	14.60
ZK37	永宁县	60	177.85	9.35	15.10	392.30	16.30	144.55	137.69	61.50	36.20	2.45	39.96	116.20	0.97	329.12	12.99	848.21	85.10	8.30
ZK38	贺兰县	260	317.73	8.90	13.00	408.40	12.80	338.81	68.76	55.82	11.39	3.06	32.48	162.26	1.30	345.87	14.73	120.23	109.59	4.90
ZK39	永宁县	190	168.47	9.95	15.10	333.00	34.56	80.65	70.59	32.84	23.21	3.20	28.40	86.71	0.52	179.15	21.82	573.98	61.47	11.30
ZK40	金凤区	230	205.11	8.96	14.60	204.60	9.00	213.12	19.32	14.16	27.11	2.29	19.97	50.15	2.16	95.66	9.59	376.29	78.06	3.10
ZK41	永宁县	240	220.80	9.00	14.50	248.00	9.42	220.80	33.36	34.80	54.00	1.98	25.83	61.00	3.64	207.70	11.19	730.90	94.35	11.40
ZK42	永宁县	220	53.18	9.08	17.80	674.80	3.20	46.47	315.11	157.60	49.45	4.32	50.92	196.69	0.41	118.00	35.16	595.29	123.71	7.50
ZK43	青铜峡市	250	193.90	9.80	14.50	1424.00	32.43	95.18	544.34	545.17	8.07	10.50	121.29	637.35	1.73	535.03	113.83	57.91	87.00	12.00
ZK44	永宁县	240	319.07	9.76	15.00	281.90	61.13	219.12	20.56	25.50	14.34	2.09	10.25	137.41	5.61	341.34	13.03	236.39	63.26	−0.90
注：—表示未检出；均为单层水采样；*数据引自文献[15，18]

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表 2 研究区水样同位素特征

Table 2. Isotopic characteristics of water samples in the study area

	样品编号	δD/‰	δ¹⁸O/‰	δ³⁴S-SO₄²⁻/ ‰	δ³⁷Cl/ ‰	⁸⁷Sr/⁸⁶Sr/ ‰	¹⁴C/a BP
地热水	TMWQ	−91.843	−12.1550	10.48	0.27	0.71421	6835
	SWQ	−82.424	−9.0418	11.18	0.33	0.71122	8740
	TLCF	−82.204	−9.3974	19.09	0.32	0.71173	26070
	TLJN	−82.915	−10.5760	13.94	0.32	0.71135	17310
	Y1*	−59.000	−6.500	—	—	—	22750
	Y3*	−79.000	−9.300	—	—	—	14360
	TSHSJ	−81.634	−9.5967	11.98	0.24	0.71780	15230
地下冷水样	CG01	−77.923	−11.1630	—	—	—	—
	CG02	−83.158	−11.9230	—	—	—	—
	CG06	−91.928	−12.7860	—	—	—	—
	CG14	−91.019	−12.8360	—	—	—	—
	ZK04	−84.639	−12.0710	—	—	—	—
	ZK06	−88.190	−12.3680	—	—	—	—
	ZK19	−85.846	−11.2660	—	—	—	—
	ZK26	−75.147	−8.6823	—	—	—	—
	ZK41	−86.974	−11.9160	—	—	—	—
	ZK43	−85.027	−11.4930	—	—	—	—
	注：—表示未检出；*数据引自文献[26]

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表 3 研究区地热水热储温度估算结果

Table 3. Estimated reservoir temperatures of geothermal water in the study area

地热区域	样品编号	石英温标(无蒸汽散失)^[49]/℃	石英温标(蒸汽散失)^[49]/℃	玉髓温标^[50]/℃	Na-K温标^[51]/℃	K-Mg温标^[51]/℃
西部地热区	TMWQ	109.6	109.2	80.2	120.8	72.1
中部地热区	SWQ	97.7	99.0	67.5	95.0	64.3
	TLCF	107.5	107.4	78.0	99.2	71.7
	TLJN	84.9	87.9	53.9	78.4	40.3
	Y1	107.8	107.7	78.3	111.7	79.2
	Y3	91.2	93.4	60.6	99.8	64.5
东部地热区	TSHSJ	78.9	82.6	47.5	188.3	92.4
最小值		78.9	82.6	47.5	78.4	40.3
最大值		109.6	109.2	80.2	188.3	92.4
平均值		96.8	97.1	66.6	113.3	69.2

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表 4 研究区地热水循环深度估算结果

Table 4. Estimated circulation depths of geothermal water in study area

地热区域	样品编号	采样温度/℃	热储温度/℃	循环深度/m
西部地热区	TMWQ	50.0	109.6	4408.4
中部地热区	SWQ	55.2	97.7	4303.8
	TLCF	59.1	107.5	4779.1
	TLJN	36.6	84.9	3679.7
	Y1	67.5	107.8	4794.0
	Y3	55.0	91.2	3987.7
东部地热区	TSHSJ	36.5	78.9	3455.4

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表 5 研究区花岗岩样品铀、钍、钾含量及放射性生热率

Table 5. Uranium, thorium, and potassium contents and radioactive heat production rates of granite samples in the study area

样品编号	岩石类型	w(K)/%	w(Th)/ (μg·g⁻¹)	w(U)/ (μg·g⁻¹)	生热率A/ (μW·m⁻³)
R01	花岗岩	1.0322553	3.75	0.81	0.5645351
R02	花岗岩	4.5381064	0.59	0.21	0.5214304
R03	花岗岩	3.131617	0.17	0.14	0.3419827

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