OOIR: Observatory of International Research

Papers

(The TQCC of International Journal of Coal Geology is 12. 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 2020-10-01 to 2024-10-01.)

Article	Citations
X-ray tomography imaging of shale microstructures: A review in the context of multiscale correlative imaging	85
Impact of thermal maturity on the diagenesis and porosity of lacustrine oil-prone shales: Insights from natural shale samples with thermal maturation in the oil generation window	53
A comprehensive review of deep coalbed methane and recent developments in China	51
Fracture variation in high-rank coal induced by hydraulic fracturing using X-ray computer tomography and digital volume correlation	50
Comprehensive evaluation of potential coal mine dust emissions in an open-pit coal mine in Northwest China	48
Mineralogical and geochemical characteristics of altered volcanic ashes (tonsteins and K-bentonites) from the latest Permian coal-bearing strata of western Guizhou Province, southwestern China	48
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	45
First insights into mineralogy, geochemistry, and isotopic signatures of the Upper Triassic high‑sulfur coals from the Thai Nguyen Coal field, NE Vietnam	43
Depositional environment, thermal maturity and shale oil potential of the Cretaceous Qingshankou Formation in the eastern Changling Sag, Songliao Basin, China: An integrated organic and inorganic geoc	42
Thermal evolution behavior of the organic matter and a ray of light on the origin of vitrinite-like maceral in the Mesoproterozoic and Lower Cambrian black shales: Insights from artificial maturation	41
A review of spatially resolved techniques and applications of organic petrography in shale petroleum systems	40
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	39
The molecular model of Marcellus shale kerogen: Experimental characterization and structure reconstruction	39
Paleo-depositional environment, origin and characteristics of organic matter of the Triassic Chang 7 Member of the Yanchang Formation throughout the mid-western part of the Ordos Basin, China	36
Morphology, chemical and mineralogical composition of magnetic fraction of coal fly ash	36
Geological controls on the distribution of REY-Zr (Hf)-Nb (Ta) enrichment horizons in late Permian coals from the Qiandongbei Coalfield, Guizhou Province, SW China	36
Geological factors controlling variations in the mineralogical and elemental compositions of Late Permian coals from the Zhijin-Nayong Coalfield, western Guizhou, China	35
Particle size and mineralogy distributions in respirable dust samples from 25 US underground coal mines	35
Geochemistry of two high-lithium content coal seams, Shanxi Province, China	34
Numerical investigation of the effects of proppant embedment on fracture permeability and well production in Queensland coal seam gas reservoirs	34
Evidence for the repeated occurrence of wildfires in an upper Pliocene lignite deposit from Yunnan, SW China	33
Identification of thin-layer coal texture using geophysical logging data: Investigation by Wavelet Transform and Linear Discrimination Analysis	33
Advancing the application of atomic force microscopy (AFM) to the characterization and quantification of geological material properties	32
Understanding coal quality and the critical importance of comprehensive coal analyses	32
Structural compartmentalization and its relationships with gas accumulation and gas production in the Zhengzhuang Field, southern Qinshui Basin	31

Critical metal recovery potential of Appalachian acid mine drainage treatment solids	30
A multidisciplinary study and palaeoenvironmental interpretation of middle Miocene Keles lignite (Harmancık Basin, NW Turkey), with emphasis on syngenetic zeolite formation	30
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	30
Detachment of coal fines deposited in proppant packs induced by single-phase water flow: Theoretical and experimental analyses	30
A novel NMR surface relaxivity measurements on rock cuttings for conventional and unconventional reservoirs	30
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	30
Strontium isotopes in high- and low-Ge coals from the Shengli Coalfield, Inner Mongolia, northern China: New indicators for Ge source	28
Rare earth elements and other critical elements in the magnetic fraction of fly ash from several Polish power plants	28
Effects of simulated surface freshwater environment on in situ microorganisms and their methanogenesis after tectonic uplift of a deep coal seam	28
Relating Tmax and hydrogen index to vitrinite and solid bitumen reflectance in hydrous pyrolysis residues: Comparisons to natural thermal indices	27
Rare earth elements and yttrium in Pennsylvanian coals and shales in the eastern part of the Illinois Basin	27
Enrichment and distribution of elements in the middle Miocene coal seams in the Orhaneli coalfield (NW Turkey)	27
Geological controls on gas content distribution of coal seams in the Kınık coalfield, Soma Basin, Turkey	26
Depositional environment and thermal maturity of the coal-bearing Longtan Shale in southwest Guizhou, China: Implications for shale gas resource potential	26
Geochronology, mineralogy, and geochemistry of tonsteins from the Pennsylvanian Taiyuan Formation of the Jungar Coalfield, Ordos Basin, North China	25
Origin of organic matter and organic pores in the overmature Ordovician-Silurian Wufeng-Longmaxi Shale of the Sichuan Basin, China	25
Effects of acid concentration on the recovery of rare earth elements from coal fly ash	25
Effect of pore structure on competitive sorption and diffusion of mixed methane and carbon dioxide in anthracite, South Qinshui Basin, China	24
Organic petrology and geochemistry of Lower Cretaceous lacustrine sediments in the Chaoyang Basin (Liaoning Province, northeast China): Influence of volcanic ash on algal productivity and oil shale fo	24
Effects of composition and temperature on water sorption in overmature Wufeng-Longmaxi shales	24
A novel VRo, T , and S indices conversion formulae on data from the fold-and-thrust belt of the Western Outer Carpathians (Poland)	24
Laminae characteristics of lacustrine shales from the Paleogene Kongdian Formation in the Cangdong Sag, Bohai Bay Basin, China: Why do laminated shales have better reservoir physical properties?	23
Biodegradation of early thermogenic gas and generation of secondary microbial gas in the Tieliekedong region of the northern Tarim Basin, NW China	23
Integrating advanced soft computing techniques with experimental studies for pore structure analysis of Qingshankou shale in Southern Songliao Basin, NE China	23
Goaf gas drainage and its impact on coal oxidation behaviour: A conceptual model	23
Mineralogy and geochemistry of Lower Silurian black shales from the Yangtze platform, South China	23
Mechanism for the formation of natural fractures and their effects on shale oil accumulation in Junggar Basin, NW China	23
Pore accessibility and trapping of methane in Marcellus Shale	23
Mineralogy and enrichment of critical elements (Li and Nb-Ta-Zr-Hf-Ga) in the Pennsylvanian coals from the Antaibao Surface Mine, Shanxi Province, China: derivation of pyroclastics and sediment-source	23
Predicted CO2 water rock reactions in naturally altered CO2 storage reservoir sandstones, with interbedded cemented and coaly mudstone seals	22
Potential effect of carbon dioxide injection on the functional groups of medium volatile bituminous coals analysed using in-situ diffuse reflectance Fourier-transform infrared spectroscopy	21
Oil migration, retention, and differential accumulation in “sandwiched” lacustrine shale oil systems from the Chang 7 member of the Upper Triassic Yanchang Formation, Ordos Basin, China	21
Aspects of rare earth element geochemistry of the Pond Creek coalbed, Pike County, Kentucky	21
Machine learning and data augmentation approach for identification of rare earth element potential in Indiana Coals, USA	21
Compositional evolution of organic matter in Boquillas Shale across a thermal gradient at the single particle level	20
Petrographic and geochemical characteristics of selected coal seams from the Late Cretaceous-Paleocene Guaduas Formation, Eastern Cordillera Basin, Colombia	20
Mineralogical and geochemical characteristics of coal from the Southeastern Qinshui Basin: Implications for the enrichment and economic value of Li and REY	20
Origin of the tuff parting and associated enrichments of Zr, REY, redox-sensitive and other elements in the Early Miocene coal of the Siniy Utyes Basin, southwestern Primorye, Russia	19
Geochemical and sedimentary facies study – Implication for driving mechanisms of organic matter enrichment in the lower Silurian fine-grained mudstones in the Baltic Basin (W Lithuania)	19
An insight into quartz mineral interactions with kerogen in Green River oil shale	19
Application of various machine learning techniques in predicting coal wettability for CO2 sequestration purpose	19
Middle Jurassic lacustrine source rocks controlled by an aridification event: A case study in the northern Qaidam Basin (NW China)	19
Geochemistry and rare-metal potential of coals of the Sakhalin coal basin, Sakhalin island, Russia	19
Elemental composition, environment of deposition of the lower Carboniferous Emma Fiord formation oil shale in Arctic Canada	19
Differential graphitization of organic matter in coal: Some new understandings from reflectance evolution of meta-anthracite macerals	19
Phyteral perspectives: Every maceral tells a story	18
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	18
Relationship between coal composition, fracture abundance and initial reservoir permeability: A case study in the Walloon Coal Measures, Surat Basin, Australia	18
Provenance of multi-stage volcanic ash recorded in the Late Carboniferous coal in the Jungar Coalfield, North China, and their contribution to the enrichment of critical metals in the coal	18
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	18

Petrographic and chemical structure characteristics of amorphous organic matter in marine black shales: Insights from Pennsylvanian and Devonian black shales in the Illinois Basin	18
High-speed nanoindentation mapping of organic matter-rich rocks: A critical evaluation by correlative imaging and machine learning data analysis	18
Critical insights from Rock-Eval analysis of vitrains	18
Mineralogical and geochemical characteristics of tonsteins from the Middle Jurassic Yan'an Formation, Ordos Basin, North China	17
Controls of marine shale gas accumulation in the eastern periphery of the Sichuan Basin, South China	17
Investigation of the carbon structure of naturally graphitized coals from Central Hunan, China, by density-gradient centrifugation, X-ray diffraction, and high-resolution transmission electron microsc	17
Lateral changes of organic matter preservation in the lacustrine Qingshankou Formation (Cretaceous Songliao Basin, NE China): Evidence for basin segmentation	17
Differences in CH4 and C2H6 carbon isotopic compositions from open and closed pores in coal: Implications for understanding the two-stage δ13C shift during canister desorption	17
Coal elemental (compositional) data analysis with hierarchical clustering algorithms	17
Influence of organic matter type on porosity development in the Wufeng-Longmaxi Shale: A combined microscopy, neutron scattering and physisorption approach	17
Oil shale potential of the lower cretaceous Jiufotang Formation, Beipiao Basin, Northeast China	17
Insights into solid-gas conversion and cavity growth during Underground Coal Gasification (UCG) through Thermo-Hydraulic-Chemical (THC) modelling	17
Depositional paleoenvironment and source rock characterization across the Toarcian Oceanic Anoxic Event from the eastern Tethys, Tibet, SW China	16
Characterizing mechanical heterogeneity of coal at nano-to-micro scale using combined nanoindentation and FESEM-EDS	16
Carbon stability and morphotype composition of biochars from feedstocks in the Mekong Delta, Vietnam	16
Methane absorption of coal-measure shales with and without pore water from the Qinshui Basin, North China: Based on high-pressure methane absorption experiments	16
Mineralogy, petrography, and Rock-Eval pyrolysis of late Oligocene coal seams in the Malkara coal field from the Thrace Basin (NW Turkey)	16
Mineral and rare earth element distribution in the Tunçbilek coal seam, Kütahya, Turkey	16
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	16
Comparison of the impact of moisture on methane adsorption and nanoporosity for over mature shales and their kerogens	16
Molybdenum-uranium-vanadium geochemistry in the lower Paleozoic Alum Shale of Scandinavia: Implications for vanadium exploration	16
CO2-enriched CBM accumulation mechanism for low-rank coal in the southern Junggar Basin, China	16
Prediction of higher heating value of coal based on gradient boosting regression tree model	15
Automated coal petrography using random forest	15
Nanoindentation-enhanced screening of hydraulic fracturing fluid additives	15
A physics-based probabilistic forecasting methodology for hazardous microseismicity associated with longwall coal mining	15
Changes in chemistry of vitrinite in coal through time: Insights from organic functional group characteristics	15
Alteration of organic macerals by uranium irradiation in lower Paleozoic marine shales	15
The Shahejie Formation in the Dongpu Depression, Bohai Bay Basin, China: Geochemical investigation of the origin, deposition and preservation of organic matter in a saline lacustrine environment durin	15
Meso- and microporosity characteristics of Miocene lignite and subbituminous coals in the Kınık coalfield (Soma Basin, W. Turkey)	15
Petrographical and petrophysical characterization of the late cretaceous Naparima Hill Formation, Central Range, Trinidad, West Indies	15
Deformation-related coalification: Significance for deformation within shallow crust	15
Pore accessibility by wettable fluids in overmature marine shales of China: Investigations from contrast-matching small-angle neutron scattering (CM-SANS)	15
Insights on the characteristics and sources of gas from an underground coal mine using compositional data analysis	15
Organic petrography and geochemistry of the prolific source rocks from the Jurassic Najmah and Cretaceous Makhul Formations in Kuwait – Validation and expansion of Raman spectroscopic thermal maturity	14
Trace element partitioning during coal preparation: Insights from U.S. Illinois Basin coals	14
Adherent microbes in coal seam environments prefer mineral-rich and crack-associated microhabitats	14
Influence of magmatic fluids on the organic and inorganic fractions of coals from the Peñarroya-Belmez-Espiel Basin (Spain)	14
Distribution and preconcentration of critical elements from coal fly ash by integrated physical separations	14
Geochemical characteristics of mudstones from the lower cretaceous strata of the Jixi Basin, NE China: Implications for organic matter enrichment	14
Discussion on the applicability of Th/U ratio for evaluating the paleoredox conditions of lacustrine basins	14
Isotherms and kinetics of deformation of coal during carbon dioxide sequestration and their relationship to sorption	14
Organic matter accumulations in the Santonian-Campanian (Upper Cretaceous) lacustrine Nenjiang shale (K2n) in the Songliao Basin, NE China: Terrestrial responses to OAE3?	14
Macromolecular structural changes in contact metamorphosed inertinite-rich coals from the No. 2 Seam, Witbank Coalfield (South Africa): Insights from petrography, NMR and XRD	14
Impact of thermal maturity on the concomitant evolution of the ultrafine structure and porosity of marine mudstones organic matter; contributions of electronic imaging and new spectroscopic investigat	14
How gas recovery and carbon storage capacity response to dynamic deformation of kerogen upon CO2/CH4 competitive adsorption for CCUS? Evidence from molecular dynamics	13
Distribution of rare earth and other critical elements in lignites from the Eocene Jackson Group, Texas	13
Influence of porosity on the reactivity of inertinite and vitrinite toward sodium hypochlorite: Implications for enhancing coal seam gas development	13
PAHs in feed coals and fly ashes from coal-fired thermal power plants in Bulgaria	13
Coal related fires in Portugal: New occurrences and new insights on the characterization of thermally affected and non-affected coal waste piles	13
A review of element partitioning in coal preparation	13
Organic geochemistry and petrography in Miocene coals in the Barito Basin (Tutupan Mine, Indonesia): Evidence for astronomic forcing in kerapah type peats	13
Geochemical influences on methanogenic groundwater from a low rank coal seam gas reservoir: Walloon Subgroup, Surat Basin	13
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	13
3D hybrid coupled dual continuum and discrete fracture model for simulation of CO2 injection into stimulated coal reservoirs with parallel implementation	13
Predicting hydrogen and oxygen indices (HI, OI) from conventional well logs using a Random Forest machine learning algorithm	13
On the common occurrence of sulphate with elevated δ34S in European mine waters: Sulphides, evaporites or seawater?	13
Record of Middle Jurassic wildfire and its incidental mercury emissions in northern Qaidam Basin, China: Evidence from the inertinite and mercury anomalies in coal	13
Non-overmature equivalents confirmed a high initial hydrocarbon generation potential of the Permian Longtan Shale in southern China	12
A theoretical goaf resistance model based on gas production analysis in goaf gas drainage	12
Maturation and migration processes in intact source rock micro plugs induced by chemical and thermal treatment: A new approach combining Rock-Eval pyrolysis and organic petrography	12
Differential evolution and the influencing factors of low-maturity terrestrial shale with different types of kerogen: A case study of a Jurassic shale from the northern margin of Qaidam Basin，China	12
Reasons for carbon isotope rollover in the Yan'an gas field of the southern Ordos Basin, China: Evidence from the geochemical comparison of gas from fluid inclusions with wells	12
Surface physico-chemistry governing microbial cell attachment and biofilm formation on coal	12
Characterization of deposited dust and its respirable fractions in underground coal mines: Implications for oxidative potential-driving species and source apportionment	12
Petrographical-geochemical characteristics and floral-faunal compositions of the Valia lignite deposits from Cambay Basin (Gujarat), western India	12
Co-occurrence of charcoal, polycyclic aromatic hydrocarbons and terrestrial biomarkers in an early Permian swamp to lagoonal depositional system, Paraná Basin, Rio Grande do Sul, Brazil	12
Machine learning framework for estimating CO2 adsorption on coalbed for carbon capture, utilization, and storage applications	12
The migration and mineral host changes of lithium during coal combustion: Experimental and thermodynamic calculation study	12
The influence of heating on the carbon isotope composition, organic geochemistry and petrology of coal from the Upper Silesian Coal Basin (Poland): An experimental and field study	12
Coal deposition in the Barito Basin (Southeast Borneo): The Eocene Tanjung Formation compared to the Miocene Warukin Formation	12
Characterization and pre-concentration of rare earth elements in density fractionated samples from the Waterberg Coalfield, South Africa	12
Single-well production history matching and geostatistical modeling as proxy to multi-well reservoir simulation for evaluating dynamic reservoir properties of coal seams	12
Organic facies variability and paleoenvironmental changes on the Moroccan Atlantic coast across the Cenomanian—Turonian Oceanic Anoxic Event (OAE2)	12