Performance and mechanism of the pyrite-kerogen complexes oxidation with H2O2 at low temperature during shale stimulation: An experimental and modeling study

Liu, Danqing; Yi, Manling; Yang, Sen; Liu, Fang; Li, Yilian

doi:10.1016/j.apgeochem.2022.105382

Cited by 2 publications

(3 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…48 Kerogen isolation was performed using the traditional acid treatment method according to Liu et al, 2022. 51 Samples crushed to the size of a pea were first placed in a plastic beaker, and HCl was added to remove carbonates. The solution was washed to neutrality with distilled water, and then HF was added to remove silicates, after which the solution was washed to neutrality with distilled water.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Zhou,

Liu,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Pyrite is widely distributed in lacustrine shales and has become a research focus in unconventional oil and gas exploration. Pyrite morphology is useful for identifying different types of organic matter and assessing shale oil enrichment in organic-rich shale. Abundant pyrite is developed in the source rocks from the Chang 7 Member of the Yanchang Formation in the Ordos Basin, NW China. However, the relationship between different pyrite types and the differential enrichment of shale oil still needs to be clarified. The organic geochemistry, petrology, and isotopic composition of the Chang 7 Member samples were analyzed. The significance of pyrite types and sulfur isotopic compositions as indicators of depositional environments and shale oil enrichment was emphasized. The Chang 7 shales contain three pyrite morphologies, framboidal pyrite (type A), spherulitic pyrite (type B), and euhedral and anhedral pyrite (type C), and their aggregates. The sulfur isotopic compositions of pyrite (δ 34 S py ) in Chang 7 shales with different pyrite types exhibited regular patterns. The δ 34 S values of types A, B, and C pyrites were sequentially positive overall (average values are −2.739, 2.201, and 7.487‰ in sequence), indicating that type A pyrite was formed during the syn-sedimentary to early diagenetic stage and types B and C pyrites were formed during the early to middle diagenetic stage. Types A, B, and C pyrites showed sequentially increasing kerogen type index values and kerogen carbon isotope values (mean values of −31.59, −28.70, and −26.45‰, successively), indicating that the horizons where types A, B, and C pyrites developed correspond to types I, II, and III organic matter, respectively. Strong correlations between the pyrite content and oil components reveal that pyrite indicates shale oil enrichment. Moreover, variations in pyrite type significantly influenced the enrichment behavior of shale oil. Types A and B pyrites contributing to reservoir space showed shale oil enrichment. They promoted saturated hydrocarbon enrichment at >15% pyrite content, whereas type C pyrite did not indicate shale oil enrichment. These findings provide new insights into the differential enrichment of organic matter and shale oil and valuable guidance for the large-scale exploration and development of shale oil resources.

show abstract

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…Kerogen isolation was performed using the traditional acid treatment method according to Liu et al, 2022 . Samples crushed to the size of a pea were first placed in a plastic beaker, and HCl was added to remove carbonates.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Zhou,

Liu,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Inorganic oxidants can be employed as pyrite flotation inhibitors, as pyrite is more sensitive to oxidants compared with other sulfides (Hong et al, 2017;Mu et al, 2016;Zhang et al, 2023). H2O2 is an efficient oxidant for pyrite (Liu et al, 2022). The application of this oxidant is attracting considerable attention (Chen et al, 2022;Suyantara et al, 2018), owing to its minimal impact on the environment and low price.…”

Section: Introductionmentioning

confidence: 99%

New insights into pyrite-hydrogen peroxide interactions during froth flotation: experimental and DFT study

Cao¹,

Yan²,

Liu³

et al. 2022

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

Hydrogen peroxide (H2O2) is an efficient depressant for pyrite (FeS2) flotation. However, the depressing mechanism of H2O2 is not fully understood. In this paper, the depressing capacity of H2O2 for pyrite was examined by flotation tests. Results revealed that pyrite flotation could be inhibited by H2O2 at pH 6.4. The pyrite powder in H2O2 solution enhanced the release of O2 from H2O2. However, the O2 concentration in the solution was less than that of H2O2; thus, H2O2 is the major oxidant in the solution. Moreover, density functional theory calculations were performed to study the interactions between H2O2 and hydrated pyrite (100) surface. The H2O2 molecule tended to react with the pyrite surface to generate one S=O bond and an H2O molecule. The possible binding models of O2 molecules on the pyrite (100) surface were also studied for comparison. The O2 dissociation on the pyrite surface was more favorable than the adsorption of O2 as a whole. In addition, the orbital interaction in the S=O bond raised from the reaction of H2O2/O2 with the pyrite surface was also investigated by the density states analysis. These results provide some insights into the oxidizing effect of H2O2 in pyrite flotation.

show abstract

Performance and mechanism of the pyrite-kerogen complexes oxidation with H2O2 at low temperature during shale stimulation: An experimental and modeling study

Cited by 2 publications

References 52 publications

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

New insights into pyrite-hydrogen peroxide interactions during froth flotation: experimental and DFT study

Contact Info

Product

Resources

About