Organic matter provenance and accumulation of transitional facies coal and mudstone in Yangquan, China: Insights from petrology and geochemistry

Pan, Jienan; Ge, Taoyuan; Liu, Weiqing; Wang, Kai; Wang, Xianglong; Mou, Pengwei; Wu, Wei; Niu, Yongbin

doi:10.1016/j.jngse.2021.104076

Cited by 17 publications

(11 citation statements)

References 32 publications

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“…However, the accumulation of organic matter always depends on the paleoenvironment and paleoclimate in the sedimentary period . The anoxic water environment and stable provenance are favorable for the preservation of organic matter. , Compared with the marine shale, the organic matter in transitional source rocks is possibly derived from both marine and terrestrial inputs. , This difference in source inputs also indirectly leads to the uniqueness of transitional gas generation, accumulation, and storage. Meanwhile, the difference of carbon and nitrogen stable isotopes between natural gas and organic matter is an important symbol to distinguish marine source rocks from transitional source rocks. , On the other hand, transitional strata are usually the assemblage of coal, mudstone, shale, and sandstone and form a cyclical distribution of lithology vertically. , This also leads to the special diagenetic background of transitional facies, making the mineral and maceral composition of coal-bearing rocks influenced by the terrigenous clastic material compared with marine shale. − Moreover, burial thermal metamorphism experienced by transitional source rocks in North China is weaker than that of marine shale, which leads to the lower maturity of organic matter. − Accordingly, the thermal evolution and hydrocarbon generation potential of transitional shale are very different from those of marine shale.…”

Section: Introductionmentioning

confidence: 99%

“…12,21 Compared with the marine shale, the organic matter in transitional source rocks is possibly derived from both marine and terrestrial inputs. 22,23 This difference in source inputs also indirectly leads to the uniqueness of transitional gas generation, accumulation, and storage. Meanwhile, the difference of carbon and nitrogen stable isotopes between natural gas and organic matter is an important symbol to distinguish marine source rocks from transitional source rocks.…”

Section: Introductionmentioning

confidence: 99%

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Paleoenvironment, Provenance, and Hydrocarbon Potential of Lower Permian Coal-Bearing Source Rocks in the Southern North China Basin: A Case Study of the Pingdingshan Coalfield

Wan

et al. 2022

ACS Earth Space Chem.

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Coal measures, widely developed in the marine–continental transitional environment, have been regarded as an important reservoir of petroleum resources, such as coalbed methane, shale gas, and tight sandstone gas. In this study, petrography, organic geochemistry, and isotope geochemistry were conducted to reveal the organic matter sources, maturation, and paleoenvironment of Permian coal-bearing source rocks in the Pingdingshan coalfield, China. Organic petrography indicates that the organic matter of the Lower Shanxi shales are derived from the terrigenous and marine mixed inputs and those of the coals are mostly sourced from terrigenous input. Thermal parameters suggest that the source rocks of the Lower Shanxi Formation reached the late oil generation stage (∼1.06% R o), and that of the Upper Shanxi Formation entered the early oil generation stage (∼0.87% R o). Geochemical results suggest good hydrocarbon potential of all coal samples but poor potential of most mudstones and shales. The generated hydrocarbons generally originate from the in situ source rocks, and no obvious migrated hydrocarbons exist due to the low production indexes. δ13C and δ15N values of coals are significantly more negative than those of mudstones and shales, suggesting that the plants flourished with efficient photosynthesis and the coals experienced intense microbial nitrogen fixation during the coal-forming period. Rapid propagation of terrestrial plants leads to the increase of carbon fixation by photosynthesis and the enrichment of 13C in the atmosphere. The increase of the sea level may lead to the massive burial of terrestrial plants in peat swamps, which decreases the photosynthesis and increases nitrogen fixation, resulting in the depletion of 13C in the atmosphere and the enrichment of 15N in organic matter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paleoenvironment, Provenance, and Hydrocarbon Potential of Lower Permian Coal-Bearing Source Rocks in the Southern North China Basin: A Case Study of the Pingdingshan Coalfield

Wan

et al. 2022

ACS Earth Space Chem.

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“…In terms of coal resources, the Hegang coalfield is rich [20,21]. Although there has been much literature focusing on coal geochemical and mineralogical characteristics in China, these works are mainly concentrated in the coals in southwestern and northern China [13,[22][23][24][25][26][27][28][29]. In Heilongjiang province, a few studies [30,31] have been carried out about coal-bearing sequences in the Hegang coalfield.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Geochemistry of the Lower Cretaceous Coals in the Junde Mine, Hegang Coalfield, Northeastern China

Wei

Qin

et al. 2022

Energies

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Hegang coalfield is one of the areas with abundant coal resources in Heilongjiang Province. Characteristics of minerals and geochemistry of No. 26 coal (lower Cretaceous coals) from Junde mine, Hegang coalfield, Heilongjiang province, China, were reported. The results showed that No. 26 coal of Junde mine is slightly enriched in Cs, Pb, and Zr compared with world coals. The minerals in No. 26 coal of Junde mine primarily include clay minerals and quartz, followed by calcite, siderite, pyrite, monazite, and zircon. The diagrams of Al2O3–TiO2, Zr/Sc–Th/Sc, Al2O3/TiO2–Sr/Y, and Al2O3/TiO2–La/Yb indicate that the enriched elements in No. 26 coal were mainly sourced from the Late Paleozoic meta-igneous rocks in Jiamusi block. The volcanic ash contribution to No. 26 coal seems very low. Sulfate sulfur indicating oxidation/evaporation gradually decreases during No. 26 coal formation.

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“…The preservation model suggests that anoxic water effectively slowed the consumption of organic matter (OM), increased its burial flux, and promoted the formation of black shale (Algeo and Maynard, 2004). Studies have shown that the anoxic water column may be the main controlling factor in black shale formation and biological extinction as compared to higher primary productivity (Hammarlund et al, 2012;Gomes and Hurtgen, 2015;Liu et al, 2016;Zou et al, 2018;Li et al, 2019;Li N. et al, 2021;Pan et al, 2021;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Distribution Characteristics and Genesis of Marine Anoxic Conditions in the Southwest of the Upper Yangtze Basin During the Late Ordovician–Early Silurian, South China

et al. 2022

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The distribution characteristics and formation of marine anoxic conditions through the Late Ordovician–Early Silurian (O–S) remain poorly resolved despite their importance in the preservation of sedimentary organic matter and the formation of black shale. In this study, the major, trace, and pyrite δ34S (δ34Spy) contents of 36 shale samples at the edge of the southwest depocenter of the Upper Yangtze Basin (Tianlin and Changhebian sections) were analyzed to understand the redox conditions, terrigenous clastic inputs, and primary productivity changes. The iron speciation and enrichment factor of U and Mo show that the range of anoxic conditions gradually expanded from the sedimentation center to the edge during the late Katian stage, peaked in the early Hirnantian stage followed by a rapid decrease, and expanded again during the early Rhuddanian stage. Comprehensive index analysis showed that the increase of terrigenous clastic input and the relative decrease of primary productivity due to tectonism and sea level change controlled the transformation of the water column from anoxic, especially euxinic, to suboxic-oxic conditions. This is reflected in the correlation between paleo-salinity, δ34Spy, chemical index of alteration, and the organic carbon accumulation rate. This work emphasizes the control of terrigenous clastic input and sulfate availability on the transformation of marine redox conditions during the O-S period in semi-restricted basins.

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Organic matter provenance and accumulation of transitional facies coal and mudstone in Yangquan, China: Insights from petrology and geochemistry

Cited by 17 publications

References 32 publications

Paleoenvironment, Provenance, and Hydrocarbon Potential of Lower Permian Coal-Bearing Source Rocks in the Southern North China Basin: A Case Study of the Pingdingshan Coalfield

Paleoenvironment, Provenance, and Hydrocarbon Potential of Lower Permian Coal-Bearing Source Rocks in the Southern North China Basin: A Case Study of the Pingdingshan Coalfield

Mineralogy and Geochemistry of the Lower Cretaceous Coals in the Junde Mine, Hegang Coalfield, Northeastern China

Distribution Characteristics and Genesis of Marine Anoxic Conditions in the Southwest of the Upper Yangtze Basin During the Late Ordovician–Early Silurian, South China

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