Water-rock interaction and methanogenesis in formation water in the southeast Huaibei coalfield, China

Li, Qingguang; Ju, Yi‐Hsu; Lu, Weiqi; Wang, Guochang; Neupane, Bhupati; Sun, Yue

doi:10.1016/j.marpetgeo.2016.06.021

Cited by 33 publications

(18 citation statements)

References 39 publications

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“…DIC is readily available in the majority of coal reservoir water and mainly originates from organic matter breakdown and carbonate dissolution with significantly negative isotopic composition of δ 13 C DIC . In contrast, positive δ 13 C DIC is related to micro-organic activities such as methanogenesis in reductive coalbed reservoir environments (Li et al., 2016, 2019).…”

Section: Resultsmentioning

confidence: 99%

Biogeochemistry and the associated redox signature of co-produced water from coalbed methane wells in the Shizhuangnan block in the southern Qinshui Basin, China

Tang

Zhang

et al. 2020

Energy Exploration & Exploitation

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To meet the global energy demands, the exploitation of coalbed methane has received increasing attention. Biogeochemical parameters of co-produced water from coalbed methane wells were performed in the No. 3 coal seam in the Shizhuangnan block of the southern Qinshui Basin (China). These biogeochemical parameters were firstly utilized to assess coal reservoir environments and corresponding coalbed methane production. A high level of Na+ and HCO3– and deuterium drift were found to be accompanied by high gas production rates, but these parameters are unreliable to some extent. Dissolved inorganic carbon (DIC) isotopes δ13CDIC from water can be used to distinguish the environmental redox conditions. Positive δ13CDIC values within a reasonable range suggest reductive conditions suitable for methanogen metabolism and were accompanied by high gas production rates. SO42–, NO3– and related isotopes affected by various bacteria corresponding to various redox conditions are considered effective parameters to identify redox states and gas production rates. Importantly, the combination of δ13CDIC and SO42– can be used to evaluate gas production rates and predict potentially beneficial areas. The wells with moderate δ13CDIC and negligible SO42– represent appropriate reductive conditions, as observed in most high and intermediate production wells. Furthermore, the wells with highest δ13CDIC and negligible SO42– exhibit low production rates, as the most reductive environments were too strict to extend pressure drop funnels.

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Section: Resultsmentioning

confidence: 99%

Biogeochemistry and the associated redox signature of co-produced water from coalbed methane wells in the Shizhuangnan block in the southern Qinshui Basin, China

Tang

Zhang

et al. 2020

Energy Exploration & Exploitation

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“…In contrast, water samples subject to evaporation or water-rock interaction will generally deviate plot below the line [36]. Table 2 shows that the hydrogen and oxygen isotopic compositions of water produced by CBM wells were relatively close, with δD values ranging from -85.8‰ to -79.5‰ (average: -82.3‰) and δ 18 O values ranging from -12.2‰ to -9.3‰ (average: -11‰). Projection of these composition data in Figure 4 revealed that most well data in the study area were distributed below the CMWL and displayed an 18 O drift, reflecting a strong evaporation existence in this region (line slope is 1.87).…”

Section: Isotopic Compositions Of Hydrogen and Oxygen Andmentioning

confidence: 99%

“…Since Craig [12] first proposed the linear relationship between the hydrogen and oxygen isotopes in global precipitation (δD = 8δ 18 O + 10) as the global meteoric water line (GMWL), hydrogen and oxygen isotopic compositions have been widely used in hydrogeochemical research [13], primarily to determine the sources of water and the types of and mechanisms underlying water-rock interactions [14,15]. The main types of water-rock interactions include ion exchange, calcite and dolomite precipitation, and the dissolution of silicates, gypsum, CO 2 , and evaporites [16][17][18]. Guo et al [8] found that coalbed-produced waters in the Bide-Santang basin of western Guizhou exhibit a D drift indicative of hydrogen content in the coalbed that is higher than that of oxygen and established a template for identifying water sources.…”

Section: Introductionmentioning

confidence: 99%

“…The coalbed-produced water's oxygen isotopes displayed a characteristic 18 O drift and enrichment, indicating that the 16 O isotope in the water was preferentially exchanged with the coal organic matter. Early evaporation is also contributed to the enrichment of TDS (total dissolved solids) and 18 O in the water. The central part of the study area, including the Qijia anticline, was affected by the Yanshanian uplift and denudation and subsequently developed a water-conducting fissure zone and was recharged atmospheric precipitation; these conditions were conducive to the formation of secondary biogenic gas.…”

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confidence: 99%

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Hydrogeochemical Characteristics and Water–Rock Interactions of Coalbed-Produced Water Derived from the Dafosi Biogenic Gas Field in the Southern Margin of Ordos Basin, China

Bao

Wang

et al. 2021

Geofluids

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The hydrogeochemical characteristics of coalbed-produced water can provide insights into the sources of ions and water, the groundwater environments, hydrodynamic conditions, and water-rock interactions of depositional basins. To study the water-rock reaction process and reveal whether there is a microbial activity in the groundwater, a case of the Dafosi biogenic gas field was chosen by testing the ionic concentrations and hydrogen and oxygen isotopic compositions of coalbed-produced water and employing R-type cluster and principal component analyses. The results showed that Na+, Cl − , and HCO3- are the principal ions in the coalbed-produced water, while the water type is mainly a Na–Cl. Due to the hydrolysis of HCO3-, the pH in this region was controlled primarily by HCO3-. As the main cation in water, Na+ contributed substantially to the total dissolved solids. Na+ is also related to the exchange between rock-bound Na+ and Ca2+ and Mg2+ in water or surrounding rocks. The coalbed-produced water’s oxygen isotopes displayed a characteristic 18O drift and enrichment, indicating that the 16O isotope in the water was preferentially exchanged with the coal organic matter. Early evaporation is also contributed to the enrichment of TDS (total dissolved solids) and 18O in the water. The central part of the study area, including the Qijia anticline, was affected by the Yanshanian uplift and denudation and subsequently developed a water-conducting fissure zone and was recharged atmospheric precipitation; these conditions were conducive to the formation of secondary biogenic gas.

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“…Previous studies have revealed that an influx of meteoric recharge and surface water introduces and stimulates microbial communities in shallow coal reservoirs, resulting in coal reservoir water systems being ideal to study the role of biogeochemical processes [12]. In coal reservoir water, the injection of meteoric water and organic material enable the system to have abundant microbes [13].…”

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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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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Water-rock interaction and methanogenesis in formation water in the southeast Huaibei coalfield, China

Cited by 33 publications

References 39 publications

Biogeochemistry and the associated redox signature of co-produced water from coalbed methane wells in the Shizhuangnan block in the southern Qinshui Basin, China

Biogeochemistry and the associated redox signature of co-produced water from coalbed methane wells in the Shizhuangnan block in the southern Qinshui Basin, China

Hydrogeochemical Characteristics and Water–Rock Interactions of Coalbed-Produced Water Derived from the Dafosi Biogenic Gas Field in the Southern Margin of Ordos Basin, China

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

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