Isotope Drift Characteristics in Ordovician Limestone Karst Water Caused by Coal Mining in Northern China

Hao, Chunming; Huang, Yue; He, Peiyong; Sun, Wei

doi:10.1007/s10230-019-00606-4

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…For karst aquifer, the water content of aquifer is closely related to karst development 35 , 36 . Therefore, geological structure and aquifer are taken into account in the selection of evaluation indexes.…”

Section: Discussionmentioning

confidence: 99%

Evaluating water-yield property of karst aquifer based on the AHP and CV

Ding

Zeng

2022

Sci Rep

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In order to ensure the safety of mine production, it is of great practical significance to make a reasonable evaluation of the water-yield property (WYP) of a karst aquifer. In this paper, we selected fault-lines distribution, fault-scale index, aquifer thickness, water pressure, consumption of rinsing liquid, and hydraulic conductivity as the evaluation indexes to analyze the WYP of a karst aquifer. Meanwhile, the analytic hierarchy process (AHP) is used to calculate the subjective weight of indexes, and the coefficient of variation (CV) is used to calculate the objective weight of indexes. Combined with GIS, a multi-factor composite superposition is carried out to evaluate the WYP of a karst aquifer. The reliability of the research results is verified by the specific yield. Besides, for improving the reliability of evaluation results, the chemical composition of karst water was discussed. The results show that the selection of indexes is reasonable and the AHP–CV method is effective to evaluate the WYP of a karst aquifer. Therefore, on the premise of reasonable index selection, the evaluation models of AHP and CV can be used to evaluate the WYP of a karst aquifer and provide reference for coal mine water control measures.

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Section: Discussionmentioning

confidence: 99%

Evaluating water-yield property of karst aquifer based on the AHP and CV

Ding

Zeng

2022

Sci Rep

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“…However, the specific yield of boreholes BS1 and BS2 is not consistent with the results of the WYP, and the accuracy of the evaluation results is 80%. For karst aquifer, the water content of aquifer is closely related to karst development (Hao et al 2019;Ghasemizadeh et al 2012). Therefore, geological structure and aquifer are taken into account in the selection of evaluation indexes.…”

Section: Discussionmentioning

confidence: 99%

Evaluating Water-Yield Property of Karst Aquifer Based On The AHP And CV

Ding

Zeng

2021

Preprint

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In order to ensure the safety of mine production, it is of great practical significance to make a reasonable evaluation of the water-yield property (WYP) of a karst aquifer. In this paper, we selected fault-lines distribution, fault-scale index, aquifer thickness, water pressure, consumption of rinsing liquid, and hydraulic conductivity as the evaluation indexes to analyze the WYP of a karst aquifer. Meanwhile, the analytic hierarchy process (AHP) is used to calculate the subjective weight of indexes, and the coefficient of variation (CV) is used to calculate the objective weight of indexes. Combined with GIS, a multi-factor composite superposition is carried out to evaluate the WYP of a karst aquifer. The reliability of the research results is verified by the specific yield. Besides, for improving the reliability of evaluation results, the chemical composition of karst water was discussed. The results show that the selection of indexes is reasonable and the AHP-CV method is effective to evaluate the WYP of a karst aquifer. Therefore, on the premise of reasonable index selection, the evaluation models of AHP and CV can be used to evaluate the WYP of a karst aquifer and provide reference for coal mine water control measures.

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“…TDS can indicate the degree of confinement in coalbed water: lower TDS suggests a relatively open hydrodynamic environment, while higher TDS indicates a relatively closed hydrodynamic environment . The Global Meteoric Water Line (GMWL), proposed by Craig, has been extensively utilized in hydrogeochemical research to determine the origin of groundwater and identify water–rock interactions using stable isotopes of hydrogen and oxygen, , which are pivotal in this field. − Furthermore, studies have indicated that the stable isotope distribution within deep groundwater is associated with groundwater flow patterns, thus serving as a reliable tracer for water circulation . The previous analysis of trace elements in CBM well water samples has indicated that specific trace elements, such as lithium (Li), gallium (Ga), rubidium (Rb), strontium (Sr), and barium (Ba), can be utilized for identifying water sources and predicting production potentials of CBM wells. , Conversely, limited research has been conducted on the presence of inorganic carbon in CBM well waters, primarily focusing on δ 13 C(CO 2 ) values resulting from carbonate dissolution or thermogenic release.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical Disparities and Constraints of Water Produced from Various Coal Seams in the Baode Block, Ordos Basin, China

Bao,

Hao,

Guo

et al. 2024

ACS Omega

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The hydrogeochemical characteristics of coalbed water play a crucial role in assessing the production level of coalbed methane (CBM) due to its involvement in the entire process of CBM generation, migration, accumulation, and extraction. To investigate variations in hydrochemical characteristics and controlling factors among different coal seams, a representative CBM field (Baode block) within the Ordos basin in China was chosen as a target. We have systematically collected produced water samples from coal seams of the Permian Shanxi Formation (P1s) and Taiyuan Formation (P1t). Tests and analyses were conducted on conventional cation and anions, trace elements, pH value, total dissolved solids (TDS), stable isotopes of hydrogen and oxygen in water, and inorganic carbon (δD, δ18O, and δ13CDIC). The findings indicate that the P1s coal seam primarily contains HCO3–Na type water, while the P1t coal seam consists of Cl–Na and HCO3–Na types of water. The disparity in water types between P1s and P1t can be attributed to interactions between water and rocks. The isotopic compositions of δD, δ18O, and δ13CDIC suggest that the sampled coalbed waters originate from atmospheric precipitation, with subsequent microbial activity. It is suggested that TDS content along with bicarbonate concentration can serve as effective indicators for determining high productivity due to weaker hydraulic conditions and a more enclosed water environment in P1t coal seams; threshold values being >1000 mg/L for TDS and >10 mequiv/L for bicarbonate concentration. Additionally, microbial activity is found to be more widespread in P1t compared to P1s. Principal component analysis reveals a significantly higher contribution of conventional ions toward TDS content observed within the P1t coal seam compared to that of P1s coal seam, accompanied by alterations in pH control parameters. The water produced from the P1s coalbed is primarily controlled by evaporite and silicate weathering/dissolution coupled with substantial cation exchange. Conversely, the water in the P1t coalbed is mainly influenced by silicate weathering/dissolution as well as evaporative concentration, with a limited occurrence of cation exchange. Moreover, there are distinct disparities in ion sources between P1s and P1t. These research findings provide a scientific foundation for assessing the development potential of CBM and optimizing extraction systems within similar CBM areas.

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Isotope Drift Characteristics in Ordovician Limestone Karst Water Caused by Coal Mining in Northern China

Cited by 14 publications

References 23 publications

Evaluating water-yield property of karst aquifer based on the AHP and CV

Evaluating water-yield property of karst aquifer based on the AHP and CV

Evaluating Water-Yield Property of Karst Aquifer Based On The AHP And CV

Hydrogeochemical Disparities and Constraints of Water Produced from Various Coal Seams in the Baode Block, Ordos Basin, China

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