OOIR: Observatory of International Research

Papers

(The TQCC of International Journal of Coal Geology is 15. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-05-01 to 2026-05-01.)

Article	Citations
Editorial of the special issue: The 2023 joint 74th ICCP and 39th TSOP meeting: Organic petrology in the energy transition era: Challenges ahead	288
Editorial Board	97
Effects of acid concentration on the recovery of rare earth elements from coal fly ash	88
Intelligent classification of coal structure using multinomial logistic regression, random forest and fully connected neural network with multisource geophysical logging data	70
Interlaboratory study: Testing reproducibility of solid biofuels component identification using reflected light microscopy	68
Component identification of solid biomass fuels using reflected light microscopy: Interlaboratory study 2	65
Organic petrography and geochemistry of the Lower-Carboniferous coals from the Ekibastuz Basin, Kazakhstan	65
Organic matter accumulation, paleoenvironment and kerogen structure of the Middle Jurassic Dameigou Formation, Qaidam Basin: Evidence from organic petrography and geochemistry	59
Integrated stratigraphy of an Upper Miocene lignite-bearing succession based on wireline log, seismic and organic petrographic data in the Tiszapalkonya-1 core section, NE Hungary	58
Organic matter accumulation mechanisms in the Wufeng-Longmaxi shales in western Hubei Province, China and paleogeographic implications for the uplift of the Hunan-Hubei Submarine high	58
Hydrothermal activity control on the Mid-Triassic palaeoenvironmental evolution and organic matter enrichment mechanisms in the Ordos Basin, North China Craton	56
Deep-basin gas generation via organic–inorganic interactions: New insights from redox-controlled hydrothermal experiments at elevated temperature	55
Implications of element enrichment in paralic coals from the Carboniferous in England	53
Scanning electron microscopic evaluation of broad ion beam milling effects to sedimentary organic matter: Sputter-induced artifacts or naturally occurring porosity?	52
The implementation of subterranean barriers with mine pre-drainage to reduce coal mine methane emissions from open-cut and underground metallurgical-coal mines	51
Editorial Board	50
The occurrence of elevated δ34S in dissolved sulfate in a multi-level coal mine water system, Glasgow, UK	48
Characterizing hydrocarbon-bearing fluid inclusions using CLSM-based microspectrometry with application to the Upper Permian rock salt in the Gorleben and Morsleben sites, Germany	48
Wood-degrading fungal origin of perylene in peatlands of southern Poland: A molecular and statistical approach	47
Ranking the oil contribution of individual layers in a lacustrine shale oil system based on non-hydrocarbon analysis by FT-ICR MS	47
Unraveling hiatuses in black shales: Mechanisms and implications from the Lower Silurian Longmaxi Formation, South China	46
Petrographic and geochemical signatures of the Upper Permian Gondwana coals: Newcastle Coal Measures, Northern Sydney Basin, Australia	44
Cooper Basin REM gas shales after CO2 storage or acid reactions: Metal mobilisation and methane accessible pore changes	44
Deposition of atmospheric polycyclic aromatic hydrocarbons in rural areas: Current data and historical record from an ombrotrophic peatland	42
Comparative metabolomic reveals chemotaxonomic markers of resin fossils for identification of botanical origins	41

Structure and morphology of chars and activated carbons obtained from thermal treatment of coal and biomass origin materials, including their wastes: Results from the ICCP Microscopy of Carbon Materia	41
Application of organic petrology and chemistry in forensic studies of solid waste sites	40
Simultaneous enhanced oil recovery, CCUS and UHUS in shale oil reservoirs	40
Effect of ScCO2-H2O treatment duration on the microscopic structure of coal reservoirs: Implications for CO2 geological sequestration in coal	39
Distribution of Li, Ga, Nb, and REEs in coal as determined by LA-ICP-MS imaging: A case study from Jungar coalfield, Ordos Basin, China	37
Evaporite minerals from the coal mines of the Czech part of the Upper Silesian Basin, including a new mineral králíkite (BaCl2·2H2O)	37
Physicochemical characteristics and oxidative potential of size-segregated respirable coal mine dust: Implications for potentially hazardous agents and health risk assessment	37
A comprehensive review of deep coalbed methane and recent developments in China	36
Was coal metamorphism an influence on the minor element chemistry of the Middle Pennsylvanian Springfield (No. 9) coal in Western Kentucky?	34
Uncertainty quantification for CO2 storage during intermittent CO2-EOR in oil reservoirs	34
Genesis and accumulation mechanism of external gas in deep coal seams of the Baijiahai Uplift, Junggar Basin, China	33
Editorial Board	33
Mineral matter in the Pennsylvanian coal from the Yangquan Mining District, northeastern Qinshui Basin, China: Enrichment of critical elements and a Se-Mo-Pb-Hg assemblage	33
Effects of simulated surface freshwater environment on in situ microorganisms and their methanogenesis after tectonic uplift of a deep coal seam	33
Critical element (Nb-Ta-Zr-Hf-REE-Ga-Th-U) mineralization in Late Triassic coals from the Gaosheng Mine, Sichuan Basin, southwestern China: Coupled effects of products of sediment-source-region erosio	33
Noble gases in Paleozoic shale fluids document tectonic events and fluid migration in the Upper Yangtze Block	33
Novel insights about petroleum systems from source and reservoir rock characterization, Cretaceous Deposits, Babouri-Figuil Basin, Northern Cameroon	32
Organic matter variations in the deep marginal basin of the Western Tethys and links to various environments in isotopic Albian–Cenomanian Boundary Interval	32
Editorial Board	32
Hydrological effects of the underground hydraulic curtain with different design parameters based on numerical modeling for a co-exploitation of coal and uranium	31
Formation of boehmite through desilication of volcanic-ash-altered kaolinite and its retention for gallium: Contribution to enrichment of aluminum and gallium in coal	29
Petrological analysis of fast pyrolysis bio-oil distillation residues	29
Enrichment mechanisms of Nb, Zr, and REY in the Late Permian coal-bearing strata in western Guizhou, SW China	29
Porosity distribution in the Devonian Antrim Shale: Controlling factors and implications for gas sorption	29
Geochemistry and mineralogy of Permo-Carboniferous coals from the Fugu mining district, Shaanxi Province, China: Implications for the evolution of the northeastern Ordos Block	28
Editorial Board	28
Analytical modeling of kerogen maturation pathways: Linking pyrolytic characteristics of source rocks (HI-Tmax) with kerogen thermal decomposition kinetics	28
Petroleum evolution and its genetic relationship with the associated Jinding Pb Zn deposit in Lanping Basin, Southwest China	27
Biostratigraphy, organic petrography and carbon isotope chemostratigraphy of the Ordovician-Silurian black shales from the Northwestern Domain of Peninsular Malaysia	27
Sources and concentrations of methane, ethane, and CO2 in deep aquifers of the Surat Basin, Great Artesian Basin	27
A multi-proxy record of palaeoenvironmental and palaeoclimatic conditions during Plio-Pleistocene peat accumulation in the eastern flank of the Isparta Angle: A case study from the Şarkikaraağaç coalf	26
Systematic differences in the microstructure of cokes made from medium/high-reflectance Northern hemisphere and Australian coals	26
Changes in optical properties and morphology of anthracites oxidized under different conditions: In HNO3, air and plasma oxygen	26
Characteristics of different types of soluble organic matter in low- to middle-rank coals: Implications for tar generation and migration during tar-rich coal pyrolysis	25
Application of statistical methods to evaluate identification credibility of macerals in high-maturity marine shales	25
Kinetic characteristics of secondary hydrocarbon generation from oil shale and coal at different maturation stages: Insights from open-system pyrolysis	25
Predicting methane emissions and developing reduction strategies for a Central Appalachian Basin, USA, longwall mine through analysis and modeling of geology and degasification system performance	25
The effect of lamina and lithofacies assemblage on molecular maturity of oil in a shale source-rock reservoir	24
Organic petrology, palynology, and geochemistry of soils from serpentine barrens, Chester and Lancaster counties, Pennsylvania: Notes on maceral development	24
Rare earth resource in fly ashes from coal power plants of China: Based on machine learning model and unit-based estimation	24
Genetic identification of light oils and condensates using δD indices of C7 hydrocarbons: A case study in the Tarim Basin, NW China	24
A comprehensive review of enhanced in-situ CO2 mineralisation in Australia and New Zealand	24
Enrichment of Al-Li-Ga-Nb(Ta)-Zr(Hf) in the Permo-Carboniferous coal-bearing sequences of the Jungar Coalfield, northern China	24
Mineral transformation during high-alkali coal combustion: From laboratory to pilot to power plant	24
A Multidisciplinary approach to facies analysis and paleoenvironmental reconstruction of the Cretaceous Second White Specks Formation, Eastern Margin of the Western Interior Seaway, Canada	23
Corrigendum to “Characteristics of the low-pressure spatial and temporal distributions of oil- and gas-bearing layers in the Ordos Basin, China” [Int. J. Coal Geol. 2024 (285) 104476].	23
Geochemical and petrographic evaluation of hydrous pyrolysis experiments on core plugs of Lower Toarcian Posidonia Shale: Comparison of artificial and natural thermal maturity series	23
Editorial Board	23
Bulk and intramolecular carbon isotopic compositions of hydrocarbon gases from laboratory pyrolysis of oil shale of the Green River Formation: Implications for isotope structures of kerogens	23
Evaluating the impact of artificial maturation on the petrophysical and geochemical properties of unconventional shale formations by integrating dielectric and NMR measurements	22

The impacts of stress on the macromolecular structure of anthracites: Implications for the mechanochemical effects	22
Spatial distribution of mineral development in Carboniferous Bowland Shale, UK at 3D micro- to nano- scales	22
Geochemical and petrological characteristics coupled with stable isotope of the Permian Gondwana coals from Tatapani–Ramkola Coalfield, Son–Mahanadi Basin, India: Insights for paleodepositional and pa	22
Subcritical CO2 adsorption on geomaterials of coal-bearing strata in the context of geological carbon sequestration	22
Preparation techniques for microscopic observation of dispersed organic matter and their effect on vitrinite reflectance	22
Pore system of the multiple lithofacies reservoirs in unconventional lacustrine shale oil formation	21
CBM enrichment mechanisms in the Southern Qinshui Basin: A synergistic role of tectonic-lithological-hydrodynamic coupling	21
Organic minerals in a self-heating coal-waste dump in Upper Silesia, Poland: Structure, formation pathways and environmental issues	21
Coal seam gas reservoir characterisation based on high-resolution image logs from vertical and horizontal wells: A case study	21
Tungsten (W) geochemistry in north Asian coals (Siberia, Russian far east and Kazakhstan)	21
A review of element partitioning in coal preparation	21
Application of aromatic/aliphatic ratios analysis in revealing migration pathways in unconventional reservoirs: A case study of the Bakken Shale	21
Sulfur stable isotopes in Paleogene coals of Northeast India	21
Characterization of the ash samples before and after thermal processing aiming phosphorus extraction and residues valorization	20
Automatic organofacies identification by means of Machine Learning on Raman spectra	20
On the interactions between strength and petrology of Pennsylvania anthracite	20
Restoring the original hydrocarbon-generating potential of deep source rocks: A critical review and a novel method using the Songliao Basin, China, as a case study	20
Organic petrography, biomarkers, and stable isotope (δ13C, δD, δ15N, δ18O) compositions of liptinite-rich coals	20
Editorial Board	19
An interlaboratory study of biochar reflectance measurements: Methodological implications	19
Graphite thermometry by interactive fitting of Raman spectra	19
Geochemistry of tonsteins and its implications for Li-Zr (Hf)-Nb (Ta) enrichments in Cisuralian coal seams, Shanxi Province, North China	19
A review of influencing factors and study methods of carbon capture and storage (CCS) potential in coals	19
Petrological and geochemical evidences for anaerobic and thermochemical oxidations of methane in petroliferous basins	19
Application of self-organizing maps to coal elemental data	19
Evolution of the facies development of the Knurów deposit (USCB) based on the microlithotypes analysis	19
Influence of tectonic evolution processes on burial, thermal maturation and gas generation histories of the Wufeng-Longmaxi shale in the Sichuan Basin and adjacent areas	19
Modes of occurrence of rare earth elements and yttrium in bituminous coals with different ranks from the Hedong Coalfield, northern China	19
Assessing the impact of thermal maturation on the evolution of organic chemistry of Bakken Shale: Insights into oil generation	19
Thermodynamic and microstructural properties of the lacustrine Chang-7 shale kerogen: Implications for in-situ conversion of shale	19
Matrix permeability anisotropy of organic-rich marine shales and its geological implications: Experimental measurements and microscopic analyses	19
Editorial Board	18
Shale oil potential and mobility in low- to medium-maturity lacustrine shales: A case study of the Yanchang Formation shale in southeast Ordos Basin, China	18
Recognition and (semi-)quantitative analysis of REE-bearing minerals in coal using automated scanning electron microscopy	18
Vitrinite reflectance patterns from the Riosa-Olloniego Sector (Carboniferous, Cantabrian Zone, NW Spain): Overburden implications	18
Geochemistry of two high-lithium content coal seams, Shanxi Province, China	18
Middle Jurassic black shale deposits from the Pieniny Klippen Belt, Western Carpathians: Insights into organic matter composition, thermal maturity, depositional, and palaeoenvironmental variations	18
Editorial Board	18
Estimation of in-situ rock strength from borehole geophysical logs in Australian coal mine sites	18
Coal bed gas in Colombia: Current status	17
Organic matter preservation conditions in the third member of the Shahejie Formation (Dongpu Depression, China)	17
Extractability indices for screening coal combustion byproduct feedstocks for recovery of rare earth elements	17
Quantifying inertinite carbon in biochar	17
Effects of geochemical compositional heterogeneities on hydrocarbon expulsion and thermal maturation: An analog study of Maastrichtian source rocks from Jordan	17
First insights into mineralogy, geochemistry, and isotopic signatures of the Upper Triassic high‑sulfur coals from the Thai Nguyen Coal field, NE Vietnam	17
Pliensbachian (Early Jurassic) deep-time peatland evolution in Northwest China driven by climate change	16
Coal mine wastes: Effective mitigation of coal waste slurry and acid mine drainage through bioflocculation using mixotrophic bacteria as bioflocculants	16
Integrated geochemical, mineralogical, and U-Pb dating study of high-pyrite mafic-intermediate tonsteins from the Upper Silesian Coal Basin (Poland): Constraints on late Paleozoic volcanism and associ	16
Interactions between mineral evolution and organic acids dissolved in bitumen in hybrid shale system	16
Organic matter content and its role in shale porosity development with maturity: Insights from Baltic Basin Silurian shales	16
Interactions between surface properties of pristine coals and the intrinsic microbial communities involved in methane formation	16
Book Review	16
Geochemical characteristics and formation mechanism of organic-rich source rocks of mixed sedimentary strata in continental saline lacustrine basin: A case study of Permian Pingdiquan formation in the	16
Mineralogy and geochemistry of the Middle Jurassic coal from the Hexi Mine, Shenfu Mining Area, Ordos Basin: With an emphasis on genetic indications of siderite	15
Prediction of higher heating value of coal based on gradient boosting regression tree model	15
Machine learning framework for estimating CO2 adsorption on coalbed for carbon capture, utilization, and storage applications	15
Maturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis	15
Differential mineral diagenetic evolution of lacustrine shale: Implications for CO2 storage	15
Impact of natural weathering on source rocks: Organic and inorganic geochemical evidence from the Triassic Chang 7 outcrop profile in Tongchuan of the Southern Ordos Basin (China)	15
Organic petrology and geochemistry of the late Neogene Shizigou Formation in the Qaidam Basin, China: Characteristics of a prospective microbial gas source rock	15
Editorial Board	15
Using optical-electron correlative microscopy for shales of contrasting thermal maturity	15
Deciphering the Douro Carboniferous Basin (Pejão Coalfield, Portugal): Geochemical, petrological, and mineralogical evidence of depositional, diagenetic, and hydrothermal processes	15
The petrology of dispersed organic matter in sedimentary rocks: Review and update	15
Unveiling the organic-rich Upper Ordovician black shales of the Foz de Alge region (Central Iberian Zone, Portugal): Insights from geochemistry and organic petrography	15
Proceedings of the 38th Annual Conference of The Society for Organic Petrology: Organics in the geological cycle	15
Advancing shale geochemistry: Predicting major oxides and trace elements using machine learning in well-log analysis of the Horn River Group shales	15
A novel tail: One story from the rare taxa of the coal seam microbiome	15
Evaluating aromatization of solid bitumen generated in the presence and absence of water: Implications for solid bitumen reflectance as a thermal proxy	15
Relating systematic compositional variability to the textural occurrence of solid bitumen in shales	15
Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden	15
Experimental study of the impact of CO2 injection on the pore structure of coal: A case study from the Bowen Basin, Australia	15
Geocatalytically generated methane from low-maturity coal and shale source rocks at low temperatures (80–120 °C) over 52 months	15