Microbial and thermogenic hydrogen sulfide in the Qianjiang Depression of Jianghan Basin: Insights from sulfur isotope and volatile organic sulfur compounds measurements

Xiao, Qilin; Cai, Suyang; Liu, Jinzhong

doi:10.1016/j.apgeochem.2020.104865

Cited by 21 publications

(11 citation statements)

References 34 publications

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“…The results show that TSR can react at 100 °C and still reacts at 450 °C . TSR is influenced by several factors, including crude oil composition, reservoir fabric, mineralogy, , temperature, , pH, and unstable sulfides …”

Section: Introductionmentioning

confidence: 96%

“…13 TSR is influenced by several factors, including crude oil composition, 14 reservoir fabric, 15 mineralogy, 16,17 temperature, 18,19 pH, 14 and unstable sulfides. 20 A general sketch of some representative studies on TSR is presented in Figure 1. Theoretical calculations show that TSR can be performed when the temperature is greater than 25 °C, but the results of current simulations and experiments do not prove that TSR can occur below 100 °C.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Generation Mechanism of Hydrogen Sulfide by Thermochemical Sulfate Reduction in Heavy Oil Hot Water Flooding at Low Temperature

Wang

Zhu²,

Zhang

et al. 2023

Energy Fuels

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Hydrogen sulfide (H 2 S) is a hazardous and corrosive byproduct generated during heavy oil recovery, particularly during hot water flooding. Previous studies on factors influencing H 2 S generation during hot water flooding have been mainly focused on high temperatures (>250 °C), which may not accurately represent reservoir conditions. Moreover, the concentration of H 2 S produced by hot water flooding at low temperatures exceeds the standard. In this study, experiments were conducted on hot water flooding at low temperatures (110−150 °C). The mechanism of reactants and reaction conditions on H 2 S generation was investigated. The results showed that thermochemical sulfate reduction (TSR) was the primary reaction type responsible for H 2 S generation, while aquathermolysis and pyrite oxidation reactions weakly or did not occur. The reactivity of TSR was directly proportional to reaction temperature and time, while inversely proportional to reaction pH. The formation of oxidants ([MgSO 4 ] CIP and HSO 4 − ) was also found to be crucial for TSR initiation. Unstable organic sulfur-containing compounds were oxidized to produce CO 2 , H 2 S, SO 3 , and solid bitumen, which further sustained the autocatalytic reaction. Low temperature TSR was found to consume the saturated fraction in heavy oil and convert inorganic sulfur to organic sulfide. The increase in pH inhibited the conversion of inorganic sulfur to organic sulfur, resulting in a higher percentage of the saturated fraction. This study provides new insights into the low temperature TSR reaction mechanism and the origin of H 2 S, which can aid in better understanding and mitigation of the associated risks during heavy oil recovery.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Study on the Generation Mechanism of Hydrogen Sulfide by Thermochemical Sulfate Reduction in Heavy Oil Hot Water Flooding at Low Temperature

Wang

Zhu²,

Zhang

et al. 2023

Energy Fuels

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“…Compared to other technologies, the catalytic decomposition of sulfur-containing VOCs into hydrocarbon and hydrogen sulfide (H 2 S, used to produce sulfur by commercial Claus technology) is one of the most effective routes for removing prevalent sulfur-containing VOCs due to its high efficiency, without additional additives (O 2 , H 2 , O 3 , etc.) and the avoiding of the formation of SO x . In general, most of the current studies have been conducted on the catalytic decomposition of a single component of CH 3 SH; however, the catalytic decomposition of mercaptans with double components was rarely reported .…”

Section: Introductionmentioning

confidence: 99%

“…and the avoiding of the formation of SO x . 15 In general, most of the current studies have been conducted on the catalytic decomposition of a single component of CH 3 SH; however, the catalytic decomposition of mercaptans with double components was rarely reported. 16 The sole research that involves the transformation of a methyl and ethyl mercaptan mixture originated from the work of Hulea and co-workers, while this work mainly focused on the optimization and screening of kinds of catalysts for decomposing a single component of C 2 H 5 SH by the kinetic analysis.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Synergistic Reaction and the Deactivation Mechanism for the Catalytic Degradation of Double Components of Sulfur-Containing VOCs over ZSM-5-Based Materials

Tian

et al. 2022

Environ. Sci. Technol.

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The competitive adsorption behavior, the synergistic catalytic reaction, and deactivation mechanisms under double components of sulfur-containing volatile organic compounds (VOCs) are a bridge to solve their actual pollution problems. However, they are still unknown. Herein, simultaneous catalytic decomposition of methyl mercaptan (CH 3 SH) and ethyl mercaptan (C 2 H 5 SH) is investigated over lanthanum (La)-modified ZSM-5, and kinetic and thermodynamic results confirm a great difference in the adsorption property and catalytic transformation behavior. Meanwhile, the new synergistic reaction and deactivation mechanisms are revealed at the molecular level by combining with in situ diffuse reflectance infrared spectroscopy (in situ DRIFTS) and density functional theory (DFT) calculations. The CH 3 CH 2 * and SH* groups are presented in decomposing C 2 H 5 SH, while the new species of CH 2 *, active H* and S*, instead of CH 3 * and SH*, are proved as the key elementary groups in decomposing CH 3 SH. The competitive recombining of SH* in C 2 H 5 SH with highly active H* in dimethyl sulfide (CH 3 SCH 3 ), an intermediate in decomposing CH 3 SH, would aggravate the deposition of carbon and sulfur. La/ZSM-5 exhibits potential environmental application due to the excellent stability of 200 h and water resistance. This work gives an understanding of the adsorption, catalysis, reaction, and deactivation mechanisms for decomposing double components of sulfur-containing VOCs.

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“…At present, thermal decomposition of sulfur compounds (TDS), bacterial sulfate reduction (BSR), and sulfate thermochemical reduction (TSR) have been regarded as the most significant origins of H 2 S in natural gas reservoirs (Basafa and Hawboldt, 2019;Zhao et al, 2019). Due to the toxic effect of H 2 S on bacteria, the amount of H 2 S from the BSR process is negligible generally (Machel, 2001;Xiao et al, 2021). As for the TDS, the required sulfur compounds such as thiol, thioether, and thiophene are rather scarce in natural gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Links of Hydrogen Sulfide Content With Fluid Components and Physical Properties of Carbonate Gas Reservoirs: A Case Study of the Right Bank of Amu Darya, Turkmenistan

et al. 2022

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Hydrogen sulfide (H2S) in carbonate gas reservoirs shows strong relevance with the natural gas components and has an obvious impact on reservoir types and their petrophysical properties. In this work, core and fluid samples were collected from the Right Bank of Amu Darya reservoirs, Turkmenistan. Then, fluid composition analysis and flash evaporation experiments were performed to investigate the components of reservoir fluid. Petrophysical properties, that is, porosity and permeability, and micropore structures of cores were determined by permeameter–porosimeter and scanning electron microscope (SEM) analysis, respectively. Results in this work indicate that the H2S content shows obvious relevance to fluid components in carbonate gas reservoirs. With the increase of H2S content, the total heavy hydrocarbons and potential condensate content decrease, while the condensate density increases. In addition, at higher H2S content, larger pore and vug porosity was observed. However, in reservoirs with lower H2S content, the matrix pores are relatively tight and prone to develop fractures. Furthermore, sulfate thermochemical reduction (TSR) is found to be the dominant contributor to high H2S content in carbonate reservoirs through material and thermodynamic condition analysis. The Gibbs free energy and normalized hydrocarbon content show that the consumption of heavy hydrocarbons generally increases with carbon numbers during TSR, but reaches a minimum at the components of C7 to C9. Finally, the relationship between TSR and rock petrophysical properties was discussed, indicating that pore volume enlargement and the dissolution effect of acidic gases are the main mechanisms for TSR to improve carbonate reservoir property. Results in this study present comprehensive analyses of the links between H2S content and fluid components and petrophysical properties in carbonate gas reservoirs.

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Microbial and thermogenic hydrogen sulfide in the Qianjiang Depression of Jianghan Basin: Insights from sulfur isotope and volatile organic sulfur compounds measurements

Cited by 21 publications

References 34 publications

Study on the Generation Mechanism of Hydrogen Sulfide by Thermochemical Sulfate Reduction in Heavy Oil Hot Water Flooding at Low Temperature

Study on the Generation Mechanism of Hydrogen Sulfide by Thermochemical Sulfate Reduction in Heavy Oil Hot Water Flooding at Low Temperature

Unraveling the Synergistic Reaction and the Deactivation Mechanism for the Catalytic Degradation of Double Components of Sulfur-Containing VOCs over ZSM-5-Based Materials

Links of Hydrogen Sulfide Content With Fluid Components and Physical Properties of Carbonate Gas Reservoirs: A Case Study of the Right Bank of Amu Darya, Turkmenistan

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