Hydrogeochemistry characteristics of produced waters from CBM wells in Southern Qinshui Basin and implications for CBM commingled development

Zhang, Zheng; Qin, Yong; Bai, Jie; Li, Guoqing; Zhuang, Xinguo; Wang, Xiaoming

doi:10.1016/j.jngse.2018.06.024

Cited by 67 publications

(52 citation statements)

References 34 publications

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“…In addition, the total DIC produced via AOM and HSR was consumed by authigenic carbonate precipitation. The consumption of SO 4 2− and the sum of Ca 2+ and Mg 2+ could be estimated by the concentration gradients in the study area, allowing the two unknown values (C SO42-AOM , C SO42-HSR ) in Equations (13) and (14) to be solved. In the two sampling lines, the concentration gradients of SO 4 2− were 1.9 mmol/(L × m) and…”

Section: Formation Of Sulfate Profilementioning

confidence: 99%

“…The southern Qinshui Basin is a highly productive coalbed methane commercial development region in China, containing Chengzhuang, Fanzhuang, Panzhuang, Shizhuangbei, Shizhuangnan, and Zhengzhuang (Figure 1). At present, one of the most important CBM blocks developed in the southern Qinshui Basin is the Shizhuangnan block, which has more than 1500 drainage wells [14]. The geological structure and hydrological conditions of the study area are suitable for the occurrence of CBM, with a distinct redox boundary that is favorable for the growth of various microbes.…”

Section: Introductionmentioning

confidence: 99%

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Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China

Tang

Zhang

et al. 2019

Water

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Coalbed methane is a major unconventional resource that has been exploited commercially for decades in the southern Qinshui Basin of China. The hydrogeochemical characteristics of coal reservoir water play a key role in the exploration and development of coalbed methane resources. In view of this, a detailed study was performed on coalbed methane co-produced water collected from the Shizhuangnan block to assess water–rock interactions and biogeochemical processes. Water samples were analyzed to establish major ions, isotopic compositions and perform 16S rRNA sequencing. Results suggest that the hydrochemistry was controlled by water–rock processes and that methane was consumed by sulfate reduction through calculation. Meanwhile, the isotopic compositions of water samples indicated that they had a predominantly meteoric origin and were influenced by microbial activity. The 16S rRNA sequencing results of bacteria and archaea provide an important foundation for understanding the activity of sulfate-reducing bacteria and methanogens at different hydraulic heads, which was consistent with isotopic analysis. Carbonates containing calcite and dolomite were found to be distributed at different hydraulic head due to the biogeochemical characteristics and associated water–rock interactions.

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Section: Formation Of Sulfate Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China

Tang

Zhang

et al. 2019

Water

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“… 17 , 18 By contrast, sandstones and granite are relatively isotropic and easily influenced by moisture, porosity, and pressure in thermal conductivity. 19 − 21 Their thermal conductivities increase with increasing pressure and moisture content 22 , 23 and with decreasing porosity. 24 …”

Section: Introductionmentioning

confidence: 99%

Relationship between Thermal Conductivity and Chemical Structures of Chinese Coals

2020

Self Cite

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Three different ranks of Chinese coals were investigated on the thermal conductivity and corresponding molecular structure by thermal analyzer, 13 C NMR, and HRTEM techniques. The thermal conductivity of coals measured in room temperature first shows a decrease, then a slight increase, and finally a sharp increase with increasing coalification. Ranging from 30 to 150 °C, increasing the temperature slightly improves the thermal conductivity of coals with varying degrees. Water with a higher thermal conductivity than air contributes to the thermal conductivity of porous coal samples. The value of thermal conductivity is higher along coal bedding planes than when perpendicular to beddings, which indicates the anisotropy of coal thermal conductivity. The anisotropy degree increases with the rank of coals and is affected by clay minerals when coals adsorb water. Molecular structure analysis shows that polycondensed aromatic ring related to lattice vibration contributes to the increase of thermal conductivity. The aliphatic bridges among aromatic clusters ensure the continuity of atom vibrations and contribute to energy transport, but the free-ended side chains have the opposite effect. The relative ordered distributions of lattice fringes of anthracite, which were higher than those of bituminous coal, enhance the anisotropy of thermal conductivity.

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“…Different from the United States and Canada, the main elements in Bide-Santang Basin and Qinshui Basin, China are Li, Ga, Rb, Sr, Ba, Mo, Cr, As, Se, V, Mn, Co, Cu, Zn, Ag, Cs, Pb, and U. 22,23…”

Section: Introductionmentioning

confidence: 99%

Chemical Characteristics and Development Significance of Trace Elements in Produced Water with Coalbed Methane in Tiefa Basin

Tong

Huang

et al. 2019

ACS Omega

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Coalbed methane (CBM) is an unconventional natural gas resource. CBM mining releases a large amount of coproduced water, and the trace elements of CBM coproduced water can provide a basis for the exploration and development of CBM. The contents of eight major trace elements in the produced water from wellhead were tested and analyzed based on seven CBM wells in Tiefa Basin. The research indicates that Sr and Ba are the dominant trace elements with the highest concentrations in produced water. There is a positive correlation among Li, Sr, and Rb by cluster analysis and correlation analysis, which may be affected by the total dissolved solids and pH in the groundwater. The contents of Li, Sr, and Ba increase with the burial depth of coal seam and could be influenced by the fault. The gas production of CBM wells is affected by the depth of the coal seams, and there is no significant correlation between water production and the coal seam depth. However, faults have an important impact on gas and water production. The productivity of coalbed methane is affected by hydrogeological conditions and structure because the productivity of CBM wells located in different tectonic locations varies with the change of Li, Sr, and Ba contents.

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Hydrogeochemistry characteristics of produced waters from CBM wells in Southern Qinshui Basin and implications for CBM commingled development

Cited by 67 publications

References 34 publications

Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China

Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China

Relationship between Thermal Conductivity and Chemical Structures of Chinese Coals

Chemical Characteristics and Development Significance of Trace Elements in Produced Water with Coalbed Methane in Tiefa Basin

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