Hydrochemical Characteristics and Formation Mechanism of Groundwater from Gas Field in the Hangjinqi,Inner Mongolia

Abstract

Abstract:

The Piper and Gibbs diagrams and alkali index are used to analyze the chemical characteristics and the formation mechanism of shallow groundwater from gas field in the Hangjinqi, Inner Mongolia. In this study, our new results suggest that the groundwater has following key features. Shallow groundwater of the study area generally has high mineralization, alkaline, brackish and great hardness; the TDS and total hardness in wet season are greater than those of the dry season. The chemical composition of shallow groundwater from the study area has a certain spatial variability on a small scale and the major cation of shallow groundwater are Na⁺, Ca²⁺; and anion is HCO₃^-with the major hydrochemical types of HCO₃-Na, HCO₃-Ca and SO₄·Cl-Na. The chemical composition of shallow groundwater originates from aluminosilicate minerals, carbonate minerals, and evaporate minerals; in addition,there is a change in chemical composition of the wet season and dry season.The formation of hydrochemical characteristics of the groundwater in study area is given priority to the rock-weathering dissolution.

Key words: groundwater, hydrochemical characteristic, formation, Hangjinqi,Inner Mongolia

CLC Number:

P641.3

WU Chu, WU Xiong, QIAN Cheng, ZHU Ge. Hydrochemical Characteristics and Formation Mechanism of Groundwater from Gas Field in the Hangjinqi,Inner Mongolia[J]. Geoscience, 2017, 31(03): 629-636.

Figures/Tables 7

References 23

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项目	丰水期					枯水期
项目	最大值	最小值	平均值	SD	CV	最大值	最小值	平均值	SD	CV
K⁺	12.50	0.85	2.66	2.41	0.91	12.40	1.04	2.88	2.88	1.00
Na⁺	332.00	17.30	124.01	98.50	0.79	351.00	18.50	116.17	114.21	0.98
Ca²⁺	132.00	26.40	70.53	29.90	0.42	132.00	62.20	70.49	32.32	0.46
Mg²⁺	83.70	8.65	27.42	18.48	0.67	74.20	8.69	26.40	15.75	0.60
SO₄^2-	384.00	24.40	115.48	115.90	1.00	496.00	22.00	114.09	119.70	1.05
Cl^-	347.00	7.30	87.37	92.00	1.05	296.00	19.30	90.43	82.22	0.91
HCO₃^-	486.00	164.00	272.36	84.52	0.31	479.00	140.00	266.86	97.35	0.36
F^-	1.07	0.01	0.52	0.30	0.58	0.98	0.38	0.57	0.16	0.28
SiO₃^2-	33.50	2.00	16.97	7.92	0.47	33.60	6.90	17.89	8.38	0.47
NO₃^-	86.40	0.71	19.04	20.17	1.06	84.60	2.96	21.84	22.98	1.05
TDS	1 440.00	241.00	595.45	343.03	0.58	1 410.00	294.00	629.57	346.45	0.55
TH	699.00	110.00	307.45	144.24	0.47	675.00	112.00	314.64	139.98	0.44
pH	8.15	7.03	7.86	0.24	0.03	8.00	7.42	7.66	0.21	0.03

项目	丰水期					枯水期
项目	最大值	最小值	平均值	SD	CV	最大值	最小值	平均值	SD	CV
K⁺	12.50	0.85	2.66	2.41	0.91	12.40	1.04	2.88	2.88	1.00
Na⁺	332.00	17.30	124.01	98.50	0.79	351.00	18.50	116.17	114.21	0.98
Ca²⁺	132.00	26.40	70.53	29.90	0.42	132.00	62.20	70.49	32.32	0.46
Mg²⁺	83.70	8.65	27.42	18.48	0.67	74.20	8.69	26.40	15.75	0.60
SO₄^2-	384.00	24.40	115.48	115.90	1.00	496.00	22.00	114.09	119.70	1.05
Cl^-	347.00	7.30	87.37	92.00	1.05	296.00	19.30	90.43	82.22	0.91
HCO₃^-	486.00	164.00	272.36	84.52	0.31	479.00	140.00	266.86	97.35	0.36
F^-	1.07	0.01	0.52	0.30	0.58	0.98	0.38	0.57	0.16	0.28
SiO₃^2-	33.50	2.00	16.97	7.92	0.47	33.60	6.90	17.89	8.38	0.47
NO₃^-	86.40	0.71	19.04	20.17	1.06	84.60	2.96	21.84	22.98	1.05
TDS	1 440.00	241.00	595.45	343.03	0.58	1 410.00	294.00	629.57	346.45	0.55
TH	699.00	110.00	307.45	144.24	0.47	675.00	112.00	314.64	139.98	0.44
pH	8.15	7.03	7.86	0.24	0.03	8.00	7.42	7.66	0.21	0.03

项目	K⁺	Ca²⁺	Na⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	NO₃^-	F^-	TDS	TH
K⁺	1	0.06	0.49	0.53	0.84^**	0.56^*	0.42	-0.31	-0.28	0.47	0.13
Ca²⁺	0.14	1	0.07	0.63^*	0.11	0.22	0.16	0.48	0.21	0.21	0.94^**
Na⁺	0.17	0.08	1	0.15	0.82^**	0.88^**	0.48	0.11	0.43	0.82^**	0.15
Mg²⁺	0.62^**	0.45^*	0.13	1	0.43	0.31	0.42	0.06	0.13	0.34	0.75^**
Cl^-	0.76^**	0.18	0.58^**	0.65^**	1	0.77^**	0.63^*	-0.03	-0.02	0.65^**	0.18
SO₄^2-	0.49^*	0.21	0.63^**	0.53^*	0.75^**	1	0.38	-0.13	0.31	0.77^**	0.31
HCO₃^-	0.21	0.11	0.54^**	0.37	0.51^*	0.55^**	1	0.07	0.07	0.37	0.25
NO₃^-	-0.13	0.56^**	-0.02	0.25	-0.01	-0.11	0.03	1	0.20	0.18	0.42
F^-	-0.21	-0.46	-0.19	-0.19	-0.14	-0.15	0.13	-0.18	1	0.49	0.30
TDS	0.52^*	0.25	0.75^**	0.6^**	0.86^**	0.91^**	0.7^**	0.05	-0.17	1	0.34
TH	0.28	0.91^**	0.06	0.7^**	0.36	0.33	0.29	0.57^**	-0.32	0.38	1

项目	K⁺	Ca²⁺	Na⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	NO₃^-	F^-	TDS	TH
K⁺	1	0.06	0.49	0.53	0.84^**	0.56^*	0.42	-0.31	-0.28	0.47	0.13
Ca²⁺	0.14	1	0.07	0.63^*	0.11	0.22	0.16	0.48	0.21	0.21	0.94^**
Na⁺	0.17	0.08	1	0.15	0.82^**	0.88^**	0.48	0.11	0.43	0.82^**	0.15
Mg²⁺	0.62^**	0.45^*	0.13	1	0.43	0.31	0.42	0.06	0.13	0.34	0.75^**
Cl^-	0.76^**	0.18	0.58^**	0.65^**	1	0.77^**	0.63^*	-0.03	-0.02	0.65^**	0.18
SO₄^2-	0.49^*	0.21	0.63^**	0.53^*	0.75^**	1	0.38	-0.13	0.31	0.77^**	0.31
HCO₃^-	0.21	0.11	0.54^**	0.37	0.51^*	0.55^**	1	0.07	0.07	0.37	0.25
NO₃^-	-0.13	0.56^**	-0.02	0.25	-0.01	-0.11	0.03	1	0.20	0.18	0.42
F^-	-0.21	-0.46	-0.19	-0.19	-0.14	-0.15	0.13	-0.18	1	0.49	0.30
TDS	0.52^*	0.25	0.75^**	0.6^**	0.86^**	0.91^**	0.7^**	0.05	-0.17	1	0.34
TH	0.28	0.91^**	0.06	0.7^**	0.36	0.33	0.29	0.57^**	-0.32	0.38	1