OOIR: Observatory of International Research

Papers

(The TQCC of International Journal of Coal Geology is 13. 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 2021-07-01 to 2025-07-01.)

Article	Citations
Deep-basin gas generation via organic–inorganic interactions: New insights from redox-controlled hydrothermal experiments at elevated temperature	149
Editorial Board	72
Organic matter accumulation, paleoenvironment and kerogen structure of the Middle Jurassic Dameigou Formation, Qaidam Basin: Evidence from organic petrography and geochemistry	64
Scanning electron microscopic evaluation of broad ion beam milling effects to sedimentary organic matter: Sputter-induced artifacts or naturally occurring porosity?	59
Intelligent classification of coal structure using multinomial logistic regression, random forest and fully connected neural network with multisource geophysical logging data	59
Organic petrography and geochemistry of the Lower-Carboniferous coals from the Ekibastuz Basin, Kazakhstan	57
Editorial of the special issue: The 2023 joint 74th ICCP and 39th TSOP meeting: Organic petrology in the energy transition era: Challenges ahead	57
Component identification of solid biomass fuels using reflected light microscopy: Interlaboratory study 2	55
Interlaboratory study: Testing reproducibility of solid biofuels component identification using reflected light microscopy	48
Effects of acid concentration on the recovery of rare earth elements from coal fly ash	48
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	48
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	47
The implementation of subterranean barriers with mine pre-drainage to reduce coal mine methane emissions from open-cut and underground metallurgical-coal mines	44
Deposition of atmospheric polycyclic aromatic hydrocarbons in rural areas: Current data and historical record from an ombrotrophic peatland	43
Editorial Board	42
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
Characterizing hydrocarbon-bearing fluid inclusions using CLSM-based microspectrometry with application to the Upper Permian rock salt in the Gorleben and Morsleben sites, Germany	41
Petrology and geochemistry of Devonian cutinitic liptobioliths from northwestern China	41
Comparative metabolomic reveals chemotaxonomic markers of resin fossils for identification of botanical origins	39
Wood-degrading fungal origin of perylene in peatlands of southern Poland: A molecular and statistical approach	39
Editorial Board	38
Application of organic petrology and chemistry in forensic studies of solid waste sites	37
Petrographic and geochemical signatures of the Upper Permian Gondwana coals: Newcastle Coal Measures, Northern Sydney Basin, Australia	36
Effect of ScCO2-H2O treatment duration on the microscopic structure of coal reservoirs: Implications for CO2 geological sequestration in coal	36
Cooper Basin REM gas shales after CO2 storage or acid reactions: Metal mobilisation and methane accessible pore changes	36

Physicochemical characteristics and oxidative potential of size-segregated respirable coal mine dust: Implications for potentially hazardous agents and health risk assessment	34
Ranking the oil contribution of individual layers in a lacustrine shale oil system based on non-hydrocarbon analysis by FT-ICR MS	34
Simultaneous enhanced oil recovery, CCUS and UHUS in shale oil reservoirs	33
Geochemical influences on methanogenic groundwater from a low rank coal seam gas reservoir: Walloon Subgroup, Surat Basin	33
The occurrence of elevated δ34S in dissolved sulfate in a multi-level coal mine water system, Glasgow, UK	33
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	32
A comprehensive review of deep coalbed methane and recent developments in China	32
The molecular model of Marcellus shale kerogen: Experimental characterization and structure reconstruction	32
Porosity distribution in the Devonian Antrim Shale: Controlling factors and implications for gas sorption	31
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	31
Organic matter variations in the deep marginal basin of the Western Tethys and links to various environments in isotopic Albian–Cenomanian Boundary Interval	31
Novel insights about petroleum systems from source and reservoir rock characterization, Cretaceous Deposits, Babouri-Figuil Basin, Northern Cameroon	30
Editorial Board	30
Hydrological effects of the underground hydraulic curtain with different design parameters based on numerical modeling for a co-exploitation of coal and uranium	30
Was coal metamorphism an influence on the minor element chemistry of the Middle Pennsylvanian Springfield (No. 9) coal in Western Kentucky?	30
Editorial Board	30
Chemical structure changes of solid bitumen during solvent swelling investigated by X-ray diffraction	30
Noble gases in Paleozoic shale fluids document tectonic events and fluid migration in the Upper Yangtze Block	29
Enrichment mechanisms of Nb, Zr, and REY in the Late Permian coal-bearing strata in western Guizhou, SW China	29
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
Effects of simulated surface freshwater environment on in situ microorganisms and their methanogenesis after tectonic uplift of a deep coal seam	28
Methane emissions and dynamics from adjacent coal seams in a high permeability multi-seam mining environment	28
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	27
Editorial Board	26
Genesis and accumulation mechanism of external gas in deep coal seams of the Baijiahai Uplift, Junggar Basin, China	26
Uncertainty quantification for CO2 storage during intermittent CO2-EOR in oil reservoirs	26
Organic petrology, palynology, and geochemistry of soils from serpentine barrens, Chester and Lancaster counties, Pennsylvania: Notes on maceral development	25
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	25
The effect of lamina and lithofacies assemblage on molecular maturity of oil in a shale source-rock reservoir	25
Corrigendum to “Simulated maturation by hydrous pyrolysis of bituminous coals and carbonaceous shales from the Upper Silesian and Lublin basins (Poland): Induced compositional variations in biomarkers	25
Petroleum evolution and its genetic relationship with the associated Jinding Pb Zn deposit in Lanping Basin, Southwest China	25
Rare earth resource in fly ashes from coal power plants of China: Based on machine learning model and unit-based estimation	24
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	23
Geochemistry and mineralogy of Permo-Carboniferous coals from the Fugu mining district, Shaanxi Province, China: Implications for the evolution of the northeastern Ordos Block	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
Enrichment of Al-Li-Ga-Nb(Ta)-Zr(Hf) in the Permo-Carboniferous coal-bearing sequences of the Jungar Coalfield, northern China	23
Biostratigraphy, organic petrography and carbon isotope chemostratigraphy of the Ordovician-Silurian black shales from the Northwestern Domain of Peninsular Malaysia	22
A comprehensive review of enhanced in-situ CO2 mineralisation in Australia and New Zealand	22
A Multidisciplinary approach to facies analysis and paleoenvironmental reconstruction of the Cretaceous Second White Specks Formation, Eastern Margin of the Western Interior Seaway, Canada	22
Preparation techniques for microscopic observation of dispersed organic matter and their effect on vitrinite reflectance	22
Systematic differences in the microstructure of cokes made from medium/high-reflectance Northern hemisphere and Australian coals	22
Geochemical and petrographic evaluation of hydrous pyrolysis experiments on core plugs of Lower Toarcian Posidonia Shale: Comparison of artificial and natural thermal maturity series	22
High microbial gas potential of Pleistocene lacustrine deposits in the central Qaidam Basin, China: An organic geochemical and petrographic assessment	22
Editorial Board	22
Genetic identification of light oils and condensates using δD indices of C7 hydrocarbons: A case study in the Tarim Basin, NW China	22
Pore accessibility and trapping of methane in Marcellus Shale	22
Sources and concentrations of methane, ethane, and CO2 in deep aquifers of the Surat Basin, Great Artesian Basin	22
Trace element partitioning during coal preparation: Insights from U.S. Illinois Basin coals	22
Tungsten (W) geochemistry in north Asian coals (Siberia, Russian far east and Kazakhstan)	21
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].	21

Spatial distribution of mineral development in Carboniferous Bowland Shale, UK at 3D micro- to nano- scales	21
Petrology of the Fire Clay coal, Bear Branch, Perry County, Kentucky	21
Experimental pyrolysis of metalliferous coal: A contribution to the understanding of pyrometamorphism of organic matter and sulfides during coal waste heaps fires	21
The impacts of stress on the macromolecular structure of anthracites: Implications for the mechanochemical effects	20
Coal seam gas reservoir characterisation based on high-resolution image logs from vertical and horizontal wells: A case study	20
Sulfur stable isotopes in Paleogene coals of Northeast India	20
Subcritical CO2 adsorption on geomaterials of coal-bearing strata in the context of geological carbon sequestration	20
Geological factors controlling variations in the mineralogical and elemental compositions of Late Permian coals from the Zhijin-Nayong Coalfield, western Guizhou, China	20
Editorial Board	20
Pore system of the multiple lithofacies reservoirs in unconventional lacustrine shale oil formation	19
Assessing the impact of thermal maturation on the evolution of organic chemistry of Bakken Shale: Insights into oil generation	19
Organic minerals in a self-heating coal-waste dump in Upper Silesia, Poland: Structure, formation pathways and environmental issues	19
Evolution of the facies development of the Knurów deposit (USCB) based on the microlithotypes analysis	19
Evaluating the impact of artificial maturation on the petrophysical and geochemical properties of unconventional shale formations by integrating dielectric and NMR measurements	19
A review of element partitioning in coal preparation	19
Application of aromatic/aliphatic ratios analysis in revealing migration pathways in unconventional reservoirs: A case study of the Bakken Shale	19
Fracture variation in high-rank coal induced by hydraulic fracturing using X-ray computer tomography and digital volume correlation	19
Organic petrography, biomarkers, and stable isotope (δ13C, δD, δ15N, δ18O) compositions of liptinite-rich coals	18
Geochemical and petrological characteristics of the Middle Jurassic organic-rich siliciclastic sediments from the central part of the Polish Basin	18
Graphite thermometry by interactive fitting of Raman spectra	18
Characterization of the ash samples before and after thermal processing aiming phosphorus extraction and residues valorization	18
Automatic organofacies identification by means of Machine Learning on Raman spectra	18
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	18
Application of self-organizing maps to coal elemental data	18
A review of influencing factors and study methods of carbon capture and storage (CCS) potential in coals	17
Thermodynamic and microstructural properties of the lacustrine Chang-7 shale kerogen: Implications for in-situ conversion of shale	17
Editorial Board	17
Organic matter content and its role in shale porosity development with maturity: Insights from Baltic Basin Silurian shales	17
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	17
Organic geochemical study of Permian series from the Jeffara and Dahar areas (Southern Tunisia): Identification and characterization of a Tunisian Permian source rock	17
Matrix permeability anisotropy of organic-rich marine shales and its geological implications: Experimental measurements and microscopic analyses	17
Multiscale synchrotron microtomography imaging of kerogen lenses in organic-rich shales from the Norwegian Continental Shelf	17
On the interactions between strength and petrology of Pennsylvania anthracite	17
Geochemistry of tonsteins and its implications for Li-Zr (Hf)-Nb (Ta) enrichments in Cisuralian coal seams, Shanxi Province, North China	17
Interactions between mineral evolution and organic acids dissolved in bitumen in hybrid shale system	17
Petrological and geochemical evidences for anaerobic and thermochemical oxidations of methane in petroliferous basins	17
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
The formation of early Eocene organic-rich mudstone in the western Pearl River Mouth Basin, South China: Insight from paleoclimate and hydrothermal activity	16
Coal mine wastes: Effective mitigation of coal waste slurry and acid mine drainage through bioflocculation using mixotrophic bacteria as bioflocculants	16
Organic matter preservation conditions in the third member of the Shahejie Formation (Dongpu Depression, China)	16
Vitrinite reflectance patterns from the Riosa-Olloniego Sector (Carboniferous, Cantabrian Zone, NW Spain): Overburden implications	16
Geochemistry of two high-lithium content coal seams, Shanxi Province, China	16
Role of zooclasts in the kerogen type and hydrocarbon potential of the lower Paleozoic Alum Shale	16
Middle Jurassic black shale deposits from the Pieniny Klippen Belt, Western Carpathians: Insights into organic matter composition, thermal maturity, depositional, and palaeoenvironmental variations	15
Recognition and (semi-)quantitative analysis of REE-bearing minerals in coal using automated scanning electron microscopy	15
Interactions between surface properties of pristine coals and the intrinsic microbial communities involved in methane formation	15
Estimation of in-situ rock strength from borehole geophysical logs in Australian coal mine sites	15
CO2-enriched CBM accumulation mechanism for low-rank coal in the southern Junggar Basin, China	15
First insights into mineralogy, geochemistry, and isotopic signatures of the Upper Triassic high‑sulfur coals from the Thai Nguyen Coal field, NE Vietnam	15
Extractability indices for screening coal combustion byproduct feedstocks for recovery of rare earth elements	15
Contrasts in maceral textures in progressive metamorphism versus near-surface hydrothermal metamorphism	15
Effects of geochemical compositional heterogeneities on hydrocarbon expulsion and thermal maturation: An analog study of Maastrichtian source rocks from Jordan	15
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	14
Controls of marine shale gas accumulation in the eastern periphery of the Sichuan Basin, South China	14
Unveiling the organic-rich Upper Ordovician black shales of the Foz de Alge region (Central Iberian Zone, Portugal): Insights from geochemistry and organic petrography	14
Differential mineral diagenetic evolution of lacustrine shale: Implications for CO2 storage	14
Climatic and environmental conditions during the Pleistocene in the Central Qaidam Basin, NE Tibetan Plateau: Evidence from GDGTs, stable isotopes and major and trace elements of the Qigequan Formatio	14
Book Review	14
Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden	14
Maturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis	14
Elemental composition, environment of deposition of the lower Carboniferous Emma Fiord formation oil shale in Arctic Canada	14
Kerogen composition and origin, oil and gas generation potential of the Berriasian Wealden Shales of the Lower Saxony Basin	14
Editorial Board	14
Deciphering the Douro Carboniferous Basin (Pejão Coalfield, Portugal): Geochemical, petrological, and mineralogical evidence of depositional, diagenetic, and hydrothermal processes	14
Machine learning framework for estimating CO2 adsorption on coalbed for carbon capture, utilization, and storage applications	14
Using optical-electron correlative microscopy for shales of contrasting thermal maturity	13
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	13
Discussion on the applicability of Th/U ratio for evaluating the paleoredox conditions of lacustrine basins	13
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)	13
Evaluating aromatization of solid bitumen generated in the presence and absence of water: Implications for solid bitumen reflectance as a thermal proxy	13
A novel tail: One story from the rare taxa of the coal seam microbiome	13
Relating systematic compositional variability to the textural occurrence of solid bitumen in shales	13
Geocatalytically generated methane from low-maturity coal and shale source rocks at low temperatures (80–120 °C) over 52 months	13
The influence of paleoclimate and a marine transgression event on organic matter accumulation in lacustrine black shales from the Late Cretaceous, southern Songliao Basin, Northeast China	13
Prediction of higher heating value of coal based on gradient boosting regression tree model	13
The petrology of dispersed organic matter in sedimentary rocks: Review and update	13