OOIR: Observatory of International Research

Papers

(The TQCC of International Journal of Coal Geology is 11. 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 2021-03-01 to 2025-03-01.)

Article	Citations
Kerogen composition and origin, oil and gas generation potential of the Berriasian Wealden Shales of the Lower Saxony Basin	89
Soft modelling of the Hardgrove grindability index of bituminous coals: An overview	58
Editorial Board	55
Contrasts in maceral textures in progressive metamorphism versus near-surface hydrothermal metamorphism	54
The implementation of subterranean barriers with mine pre-drainage to reduce coal mine methane emissions from open-cut and underground metallurgical-coal mines	51
Effects of geochemical compositional heterogeneities on hydrocarbon expulsion and thermal maturation: An analog study of Maastrichtian source rocks from Jordan	47
Chemo-hydro-mechanical effects of CO2 injection into a permeable limestone	45
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	44
Mechanisms of strain rate-dependent response of naturally fractured coal	44
Editorial Board	44
Recognition and (semi-)quantitative analysis of REE-bearing minerals in coal using automated scanning electron microscopy	43
Evaluation of elemental affinities in coal using agglomerative hierarchical clustering algorithm: A case study in a thick and mineable coal seam (kM2) from Soma Basin (W. Turkey)	42
Pore systems and organic petrology of cretaceous Mowry and Niobrara source-rock reservoirs, Powder River Basin, Wyoming, USA	41
Petrology and geochemistry of the Fire Clay coalbed, Martin County, Inez 7 ½′ quadrangle, Kentucky, USA	41
Editorial Board	37
Proceedings of the 37th Annual Meeting of the Society for Organic Petrology	37
Deep-basin gas generation via organic–inorganic interactions: New insights from redox-controlled hydrothermal experiments at elevated temperature	36
Editorial Board	35
Editorial Board	35
Organic matter preservation conditions in the third member of the Shahejie Formation (Dongpu Depression, China)	35
Editorial Board	34
Coal mine wastes: Effective mitigation of coal waste slurry and acid mine drainage through bioflocculation using mixotrophic bacteria as bioflocculants	33
Editorial Board	33
Detachment of coal fines deposited in proppant packs induced by single-phase water flow: Theoretical and experimental analyses	32
The origin of GHG's emission from self-heating coal waste dump: Atmogeochemical interactions and environmental implications	32

PAHs in feed coals and fly ashes from coal-fired thermal power plants in Bulgaria	31
Geochemistry of apatite in Late Permian coals, Bowen Basin, Australia	31
Differential graphitization of organic matter in coal: Some new understandings from reflectance evolution of meta-anthracite macerals	31
Enhancement of biogenic methane production from subbituminous coal by reduced iron-bearing clay mineral	30
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	30
Multiscale synchrotron microtomography imaging of kerogen lenses in organic-rich shales from the Norwegian Continental Shelf	30
Middle Jurassic lacustrine source rocks controlled by an aridification event: A case study in the northern Qaidam Basin (NW China)	29
The formation of early Eocene organic-rich mudstone in the western Pearl River Mouth Basin, South China: Insight from paleoclimate and hydrothermal activity	28
Rare earth elements and other critical elements in the magnetic fraction of fly ash from several Polish power plants	27
Effects of acid concentration on the recovery of rare earth elements from coal fly ash	26
Scanning electron microscopic evaluation of broad ion beam milling effects to sedimentary organic matter: Sputter-induced artifacts or naturally occurring porosity?	26
Decoupling experiments for CH4 “diffusion-seepage” in coal columns to effectively measure sorption time	26
Organic petrography and stable isotopic characteristics of Permian Talcher coal, India: Implications on depositional environment	26
Pore-scale modelling of water sorption in nanopore systems of shale	26
Hydrocarbon potential and Organofacies of the Devonian Antrim Shale, Michigan Basin	26
Revisiting the petrology of lower Pennsylvanian (Namurian and Langsettian) coals in southern West Virginia and southwestern Virginia, USA	25
Intelligent classification of coal structure using multinomial logistic regression, random forest and fully connected neural network with multisource geophysical logging data	25
Methane absorption of coal-measure shales with and without pore water from the Qinshui Basin, North China: Based on high-pressure methane absorption experiments	25
Pore systems and their correlation with oil enrichment in various lithofacies of saline lacustrine shale strata	24
Data-driven modeling to predict adsorption of hydrogen on shale kerogen: Implication for underground hydrogen storage	24
Differences and origins of hydrocarbon generation characteristics between mudstone and shale in the Seventh Member of the Yanchang Formation, Ordos Basin, China	24
Integrated containment risks assessment for subsurface CO2 storage: Overburden analysis and top seal integrity study, offshore Norway	24
First insights into mineralogy, geochemistry, and isotopic signatures of the Upper Triassic high‑sulfur coals from the Thai Nguyen Coal field, NE Vietnam	23
Geochemistry and organic petrography of the Middle Permian Lucaogou alkaline lacustrine oil shale in the southern Junggar Basin, China: Implications for formation conditions and organic matter accumul	23
Cyclical water vapor sorption-induced structural alterations of mine roof shale	23
Interactions between surface properties of pristine coals and the intrinsic microbial communities involved in methane formation	23
Oil migration from internal and external source rocks in an unconventional hybrid petroleum system, Montney Formation, western Canada	22
Estimation of in-situ rock strength from borehole geophysical logs in Australian coal mine sites	22
From abandoned mines to carbon sinks: Assessing the CO2 storage capacity of Austrian low-rank coal deposits	21
Interlaboratory study: Testing reproducibility of solid biofuels component identification using reflected light microscopy	21
Hyperspectral imaging of coal core: A focus on the visible-near-shortwave infrared (VN-SWIR) region	21
High-cellulose content of in-situ Miocene fossil tree stumps and trunks from Lusatia lignite mining district, Federal Republic of Germany	20
Palynostratigraphy of the Mississippian-Pennsylvanian boundary in the Tyler Formation, Williston Basin, USA: Implications for organic matter-rich source rocks and paleoenvironmental reconstruction	20
Solid bitumen as an indicator of petroleum migration, thermal maturity, and contact metamorphism: A case study in the Barrandian Basin (Silurian - Devonian), Czech Republic	20
Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition	20
Petrological and geochemical evidences for anaerobic and thermochemical oxidations of methane in petroliferous basins	19
Palynofacies as sea-level-sensitive proxy in Early Cretaceous marine mudstones – A critical evaluation	19
Nanomechanical characterization of organic-matter maturity by atomic force microscopy (AFM)	19
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	19
Palaeo-thermal history of the Blanice Graben (the Bohemian Massif, Czech Republic): The origin of anthracite in a late-Variscan strike-slip basin	19
Deep syntectonic burial of the Anthracite belt, Eastern Pennsylvania	19
Geomechanical characterization and mineralogical correlation of compositionally diverse world-class Kazakhstani source rocks: Insights from nanoindentation testing	19
Interactions between mineral evolution and organic acids dissolved in bitumen in hybrid shale system	19
Disentangling causes of the limestone-marl bedding couplets in the Bridge Creek Limestone Member of the Greenhorn Formation through an integrated sedimentological and organic petrology analysis	19
The influence of Early Cretaceous paleoclimate warming event on sedimentary environment evolution and organic matter sources in Yin'e Basin: Evidence from petrology and molecular geochemistry	18
Carbon stability and morphotype composition of biochars from feedstocks in the Mekong Delta, Vietnam	18
Hydrocarbon potential and depositional environment of the Middle Miocene Balikpapan Formation, lower Kutai Basin, Indonesia: Sedimentology, calcareous nannofossil, organic geochemistry, and organic pe	18
Role of zooclasts in the kerogen type and hydrocarbon potential of the lower Paleozoic Alum Shale	18
Occurrence and preservation of primary organic matter in a hybrid unconventional reservoir: Montney Formation, Western Canada Sedimentary Basin	18
Graptolite reflectance anomaly	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
Extractability indices for screening coal combustion byproduct feedstocks for recovery of rare earth elements	18
Geochemistry of two high-lithium content coal seams, Shanxi Province, China	18
Formation of natural fractures and their impact on shale oil accumulation in the Mahu Sag, Junggar Basin, NW China	18
Editorial Board	18
CO2-enriched CBM accumulation mechanism for low-rank coal in the southern Junggar Basin, China	18
Multiscale measurements of gas diffusion coefficient of coal using counter-diffusion and image-based methods	18
Relationship between coal composition, fracture abundance and initial reservoir permeability: A case study in the Walloon Coal Measures, Surat Basin, Australia	17
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	17
Organic matter accumulation, paleoenvironment and kerogen structure of the Middle Jurassic Dameigou Formation, Qaidam Basin: Evidence from organic petrography and geochemistry	17
Borehole measurements of adsorbed gas content in coals using stimulated diffusion nuclear magnetic resonance	17
The effects of sample preparation on the interpretation of pyrolysis-based organic matter analysis in immature oil shale	17
Paleoenvironmental factors controlling organic-rich formations deposition in the Babouri-Figuil Basin (Northern Cameroon)	17
Organic matter content and its role in shale porosity development with maturity: Insights from Baltic Basin Silurian shales	17
Effect of ScCO2-H2O treatment duration on the microscopic structure of coal reservoirs: Implications for CO2 geological sequestration in coal	16
Evaluating aromatization of solid bitumen generated in the presence and absence of water: Implications for solid bitumen reflectance as a thermal proxy	16
Discussion on the applicability of Th/U ratio for evaluating the paleoredox conditions of lacustrine basins	16
Movable and non-movable hydrocarbon fractions in an oil-depleted sandstone reservoir considered for CO2 storage, Nini West Field, Danish North Sea	16
Understanding coal quality and the critical importance of comprehensive coal analyses	16
Book Review	16
Editorial Board	15
Editorial Board	15
Editorial Board	15
Editorial Board	15
Editorial Board	15
Editorial Board	15
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Editorial Board	14
Editorial Board	14
Enhancing predictions of blast-induced ground vibration in open-pit mines: Comparing swarm-based optimization algorithms to optimize self-organizing neural networks	14
Elemental composition, environment of deposition of the lower Carboniferous Emma Fiord formation oil shale in Arctic Canada	14
The effects of Jurassic igneous intrusions on the generation and retention of gas shale in the Lower Permian source-reservoir shales of Karoo Basin, South Africa	14
Application of organic petrology and chemistry in forensic studies of solid waste sites	14
Comparative metabolomic reveals chemotaxonomic markers of resin fossils for identification of botanical origins	14
Using optical-electron correlative microscopy for shales of contrasting thermal maturity	14
Single-well production history matching and geostatistical modeling as proxy to multi-well reservoir simulation for evaluating dynamic reservoir properties of coal seams	14
Discussion: “Effects of acid concentration on the recovery of rare earth elements from coal fly ash” [Mokoena et al., 2022, Int. J. Coal Geology, volume 259, article 104037]	14
The occurrence of elevated δ34S in dissolved sulfate in a multi-level coal mine water system, Glasgow, UK	14
Editorial Board	14
Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng–Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China	13
Oil shale potential of the lower cretaceous Jiufotang Formation, Beipiao Basin, Northeast China	13
The molecular model of Marcellus shale kerogen: Experimental characterization and structure reconstruction	13
Influence of porosity on the reactivity of inertinite and vitrinite toward sodium hypochlorite: Implications for enhancing coal seam gas development	13
Weathering-induced organic matter enrichment in marine-continental transitional shale: A case study on the early Permian Taiyuan Formation in the Ordos Basin, China	13
Critical insights from Rock-Eval analysis of vitrains	13
A multidisciplinary study and palaeoenvironmental interpretation of middle Miocene Keles lignite (Harmancık Basin, NW Turkey), with emphasis on syngenetic zeolite formation	13
Editorial Board	13
Deformation of pores in response to uniaxial and hydrostatic stress cycling in Marcellus Shale: Implications for gas recovery	13
Thermal history of the Northwestern Argentina, Central Andean Basin, based on first-ever reported graptolite reflectance data	13
Origin and nature of pores in the Toolebuc Formation, a potential unconventional target in Australia	12
Controls of marine shale gas accumulation in the eastern periphery of the Sichuan Basin, South China	12
Ranking the oil contribution of individual layers in a lacustrine shale oil system based on non-hydrocarbon analysis by FT-ICR MS	12
Paleoenvironmental reconstruction of coal deposition during the Cretaceous-Paleogene transition in the Eastern Cordillera Basin, Colombian Andes	12
Particle size and mineralogy distributions in respirable dust samples from 25 US underground coal mines	12
Origin and geochemical significance of antimony in Chinese coal	12
Combining molecular simulation and experiment to prove micropore distribution controls methane adsorption in kerogens	12
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	12
Evaluation of gas-in-place content and gas-adsorbed ratio using carbon isotope fractionation model: A case study from Longmaxi shales in Sichuan Basin, China	12
Physicochemical characteristics and oxidative potential of size-segregated respirable coal mine dust: Implications for potentially hazardous agents and health risk assessment	12
Petrographic and geochemical signatures of the Upper Permian Gondwana coals: Newcastle Coal Measures, Northern Sydney Basin, Australia	11
Differential mineral diagenetic evolution of lacustrine shale: Implications for CO2 storage	11
Insights into coupling between in-situ coalbed water geochemical signatures and microbial communities	11
Hydrothermally-altered coal from the Daqingshan Coalfield, Inner Mongolia, northern China: Evidence from stable isotopes of C within organic matter and C-O-Sr in associated carbonates	11
Zeolite and associated mineral occurrences in high-sulphur coals from the middle Miocene upper coal seam from underground mines in the Çayirhan coalfield, (Beypazarı, Central Turkey)	11
The petrology of dispersed organic matter in sedimentary rocks: Review and update	11
Chemical characteristics, formation mechanisms, and geological evolution processes of high-salinity coal reservoir water in the Binchang area of the southern Ordos Basin, China	11
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	11
Relating systematic compositional variability to the textural occurrence of solid bitumen in shales	11
Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden	11
Gas-water flow in fractured coal revealed by multimodal imaging	11
Petrology and geochemistry of Devonian cutinitic liptobioliths from northwestern China	11
Insights into organic metagenesis using Raman spectroscopy and high resolution mass spectrometry: A case study of the Shahezi formation, deep Songliao basin, China	11