Geological Journal最新文献

{"title":"Analysing the Drivers of Cropland Footprint in Leading Agricultural Nations: Evidence From MMQR Approach","authors":"Ibrahim Cutcu,&nbsp;Magdalena Radulescu","doi":"10.1002/gj.70072","DOIUrl":"https://doi.org/10.1002/gj.70072","url":null,"abstract":"<p>Climate change represents the biggest current challenge for us and for future generations. Its impact on agriculture is undeniable, considering the food security goal. Thus, the cropland footprint has been distinguished as a comprehensive index for assessing the impact of environmental changes in agricultural areas determined by the increased living standards of people and consumption habits. This paper investigates the determinants of the cropland footprint in the top 10 agricultural countries from 1991 to 2021. Among the determinants considered are GDP per capita, urbanisation rate, employment in agriculture, arable land, fertiliser consumption and annual mean temperature. The second-generation panel data analysis technique MMQR was used in the study, after checking for Durbin–Hausman co-integration and the Pesaran CSD test. The results reveal that arable land significantly increases the cropland footprint in higher quantiles (e.g., coefficient = 0.0053 at the 0.90 quantile), while fertiliser consumption shows a significant negative effect across most quantiles (e.g., coefficient = −0.0543 at the 0.30 quantile). Additionally, GDP per capita positively influences the cropland footprint across all quantiles (e.g., coefficient = 0.2138 at the 0.50 quantile). The results from the MMQR analysis suggest that arable land has a significant and positive impact on the cropland footprint in medium and high quantiles. Additionally, fertiliser consumption and GDP per capita demonstrate significant negative and positive impacts, respectively, on the cropland footprint across almost all quantiles. Conversely, urbanisation, annual average temperature and agriculture employment do not significantly impact the cropland footprint. Based on the results, we can state that using fertilisers can help diminish the cropland footprint by increasing the fertility and productivity of the cultivated areas. At the same time, increased GDP per capita and enlarged arable land will increase the cropland footprint. In the context of robust economic growth, fertilisers are important factors to decrease the cropland footprint as a result of using large arable lands for crop purposes.</p>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2002-2019"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/gj.70072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Provenance and Paleogeographic Evolution During Triassic Continental Amalgamation: Insights From Turbiditic Successions in the West Qinling Orogen, Central China","authors":"B. Yang,&nbsp;G. H. Wang,&nbsp;H. Y. Sun,&nbsp;J. S. Wang,&nbsp;M. Chen,&nbsp;W. T. Zhao,&nbsp;R. J. Huang,&nbsp;Y. D. Wang,&nbsp;M. G. Tian","doi":"10.1002/gj.70079","DOIUrl":"https://doi.org/10.1002/gj.70079","url":null,"abstract":"<div>\u0000 \u0000 <p>The West Qinling Orogen, located at the junction of the North China Craton, the South China Craton, and the Qiangtang Block, preserves critical geological records of the amalgamation of these various blocks and, consequently, the formation of the central China continent. The successions deposited in this region contain essential sedimentary evidence that aids in reconstructing the regional tectonic geography. This helps to clarify the complex processes involved in continental assembly. This study presents new zircon U–Pb geochronology, Hf isotope, and whole-rock geochemistry data from Triassic turbidites and mafic intrusions in the West Qinling Orogen, aiming to unravel a complex tectonic history—from basin evolution to continental amalgamation. The significant spatial and temporal variation in sedimentary provenance indicates a dynamic evolution of palaeogeography in the West Qinling Orogen, which is closely linked to oceanic subduction, closure, and the eventual amalgamation of the North and South China cratons. The data suggest that basin evolution and the tectonic setting occurred in three distinct stages: (1) a back-arc extensional tectonic setting, (2) the southward migration of arc magmatism driven by the northward subduction and rollback of the Paleo-Tethyan oceanic lithosphere, and (3) the oblique amalgamation of the North and South China cratons, resulting in the diachronous closure of the depositional system from east to west. Furthermore, a comprehensive comparison of basin evolution with other successions from multiple locations provides a broader perspective on the tectonic and palaeogeographical evolution and amalgamation processes during the formation of the central China continent.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2106-2124"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extraction and Identification of Fossil Pollen From Pleistocene Pyroclastic Density Current Deposits: A Case Study From the Colli Albani Volcano","authors":"Andrea Verolino,&nbsp;Alessia D'Agostino,&nbsp;Gabriele Di Marco,&nbsp;Silvia Marvelli,&nbsp;Adam D. Switzer,&nbsp;Antonella Canini,&nbsp;Angelo Gismondi","doi":"10.1002/gj.70082","DOIUrl":"https://doi.org/10.1002/gj.70082","url":null,"abstract":"<div>\u0000 \u0000 <p>Fossil pollen has long been used for paleoenvironmental and paleoclimatic reconstructions. However, to date, pollen extraction has primarily focused on unconsolidated sedimentary successions within enclosed basins of limited spatial extent, such as lacustrine basins. In this work, we successfully extracted ancient pollen from consolidated volcanic deposits, particularly pyroclastic density current (PDC) deposits, which are usually emplaced on a large spatial and temporal scale. This exploratory study aims to test the efficacy and applicability of standardised pollen extraction methodologies on consolidated volcanic material. As a case study, we examined units from the Colli Albani Volcano, Italy, active during the Quaternary; specifically, the Trigoria—Tor de' Cenci unit, dating back approximately 550,000 years, and the more recent Peperino Albano unit, dating to about 36,000 years ago. This selection allowed us to evaluate pollen preservation across two stratigraphically distinct and well-studied units, each corresponding to different climatic periods. Furthermore, our findings shed light on pollen entrainment mechanisms within pyroclastic density currents during transport, from the source to the emplacement site. We inferred that both investigated PDCs were characterised by pollen entrainment through ground uprooting and marginal air incorporation. Our results can be validated both in terms of expected pollen type variability with respect to the location of the deposit from the source (e.g., higher pollen variability observed at the distal TTC unit) and in respect to the expected vegetation dynamics for the respective periods and areas investigated, with the latter partially verified through comparison with pollen studies at nearby locations. This work, though not exhaustive and not meant to be used for paleoenvironmental and paleoclimatic reconstructions, proves the efficacy of pollen extraction from consolidated PDCs through standard methods, and its applicability for more comprehensive studies, by incorporating pollen data from loose sedimentary successions and from nearby volcanic units.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2166-2177"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated Gravity and Magnetic Approaches for Concealed Chromitite Exploration in Sukinda Valley, Orissa, India","authors":"K. Satish Kumar,&nbsp;P. V. Sunder Raju","doi":"10.1002/gj.70074","DOIUrl":"https://doi.org/10.1002/gj.70074","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, high-resolution Gravity and Magnetics (G-M) surveys were deployed to target concealed ultramafic (UM) host rocks with Chromitite-bearing layers. These surveys were conducted in the Kathpal region, Sukinda valley, Orissa, India, on profile and grid modes with a station interval of 5 m. The acquired G-M data is processed to delineate denser bodies of &gt; 3.8 g/cc³, and is corroborated with the borehole data and lithological units. The integration of geological and geophysical data from high-precision G-M measurements was effective in deciphering the denser materials of chromite-bearing ultramafic lithounits. Spectral analysis of G-M data confirms two layers at a depth of 20 m, representing serpentinite ± chromite, and at 70 m, with ultrabasic rock units in corroboration with borehole lithology. The 2D inversion model corroborates the concealed denser rocks with chromite mineralisation and two layers of chromite with a maximum thickness of 4 and 13 m, respectively. The 3D inversion model shows expressions of denser rocks with chromite mineralisation having a thickness of 30 m.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2040-2055"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of Shale Pore During Tectonic Uplift: A Case Study of Silurian Shallow Shales From Wufeng-Longmaxi Formations in the Taiyang–Haiba Area","authors":"Li Dong,&nbsp;Pengfei Jiao,&nbsp;Zhe Yu,&nbsp;Changlin Li,&nbsp;Chunxiang Zhao","doi":"10.1002/gj.70064","DOIUrl":"https://doi.org/10.1002/gj.70064","url":null,"abstract":"<div>\u0000 \u0000 <p>Taking shallow shales (buried depth less than 2000 m) from the Wufeng Formation –Long1₁ submember in the Taiyang–Haiba area of Zhaotong in the Sichuan Basin as the focus, this study integrates field-emission scanning electron microscopy (FE-SEM), mercury intrusion porosimetry (MIP), and low-temperature N₂/CO₂ adsorption to characterise pore structures. By comparing the pore structures of shales at various burial depths, we investigate the evolution of pore systems during tectonic uplift. The results indicate that micropores and mesopores hosted in organic matter dominate the shallow Longmaxi Formation shale, contributing nearly all adsorption gas storage space and a large portion of free gas capacity. Although mesopores exhibit more complex surface morphologies and spatial configurations than micropores, micropores display stronger heterogeneity. Organic matter exerts a primary control on pore development, while carbonate and clay minerals influence meso- and macropore structures. During tectonic uplift, favourable preservation conditions persist, and a dynamic balance between pore fluid escape and the rate of overburden erosion ensures that pore structure and morphology remain essentially unaffected. This research provides a solid foundation for understanding the effects of tectonic uplift on shale pore systems and holds significant theoretical and practical implications for shale gas exploration and development.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"1853-1873"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Influence of Sedimentary Environment on Organic Matter Accumulation in Wenchang-B Depression, Zhu-III Sub-basin, the Pearl River Mouth Basin, South China Sea","authors":"Caiwei Fan","doi":"10.1002/gj.70080","DOIUrl":"https://doi.org/10.1002/gj.70080","url":null,"abstract":"<div>\u0000 \u0000 <p>Petroleum and natural gas exploration in the Pearl River Mouth Basin of the South China Sea has been an area of significant interest for researchers. The Wenchang Depression, located within this basin, has developed multiple sets of source rocks. However, the specific mechanisms governing organic matter enrichment remain poorly understood. To elucidate these processes, we conducted Rock-Eval pyrolysis on 120 mudstone samples from the Paleogene Wenchang (WC) Formation and Enping (EP) Formation, complemented by major and trace element analyses on 140 mudstone samples. Our findings have yielded several key insights: (1) The WC2 unit exhibits significantly higher TOC content and hydrocarbon generation potential compared to other units, establishing it as the most promising source interval; (2) Distinct paleoenvironmental transitions are identified, with EP and WC1 deposited under warm/humid conditions while WC2 and WC3 formed in hot/arid, high-salinity environments; (3) Most importantly, we demonstrate for the first time that organic accumulation in WC2 is primarily controlled by paleoredox conditions and paleosalinity, whereas WC3 is mainly influenced by paleoclimate and paleosalinity. These findings not only advance our understanding of differential organic matter enrichment mechanisms in rift basins but also provide crucial guidelines for future hydrocarbon exploration in the Pearl River Mouth Basin.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2125-2144"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148522913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evidence From Microscopy and U–Pb Geochronology as a Clue to the Influence of the Cretaceous Magmatism in the Diagenesis of Pre-Salt Carbonate Reservoirs in the Santos Basin (Brazil)","authors":"Marco António Ruivo de Castro e Brito,&nbsp;Cristiano Leite Sombra,&nbsp;Davy Raeder Brandão,&nbsp;Cleverson Guizan Silva,&nbsp;Sidney Luiz de Matos Mello,&nbsp;Eugênio Vaz dos Santos Neto,&nbsp;Rui Jorge Fernandes Baptista,&nbsp;Ramsés Capilla,&nbsp;Luiz Antônio Pierantoni Gambôa","doi":"10.1002/gj.70071","DOIUrl":"https://doi.org/10.1002/gj.70071","url":null,"abstract":"<p>Analyses of U–Pb isotopic geochemistry, optical, and scanning electron microscopy with mapping of chemical elements and fluid inclusions in pre-salt limestone samples from Sururu and Jupiter Field wells in the Santos Basin, confirm that at ages 121 Ma, 119 Ma, 113 Ma, and 95 Ma there was CO₂ emplacement during the formation of U-bearing calcites. The CO₂ would have been released from the crystallised magma, represented in the Sururu Field by tabular intrusive sills, and migrated through faults to the carbonate mounds. The mixing of the hot magmatic CO₂ fluid inclusions and colder lake aqueous fluid inclusions with evaporitic carbonates, as well as the high permeability of the limestone, provided thermal convection, an essential process for the formation of U contained in the calcites. The circulation of the magmatic fluid provided sufficient reducing agents to mix with a U-rich fluid already existing in the lacustrine system for U mineralisation to occur. The high temperature caused by the sill intrusion will have relocated the U initially complexed with organic matter in the shales.</p>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"1976-2001"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/gj.70071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alteration in Chrome Spinel of the Sukinda Ultramafic Rocks, Singhbhum Craton, Eastern India and Its Bearing on the Origin of Ferritchromit","authors":"Priyadarshini Sharma,&nbsp;Asish Kumar Das,&nbsp;Birendra Kumar Mohapatra","doi":"10.1002/gj.70069","DOIUrl":"https://doi.org/10.1002/gj.70069","url":null,"abstract":"<div>\u0000 \u0000 <p>The chrome spinel in Sukinda ultramafic rocks, serpentinite-dunite-peridotite in particular, in Singhbhum Craton, Odisha, eastern India, often exhibits optical and chemical alteration. Four compositionally different zones are identified in some of the altered chromite grains; though optically they are distinguished into two such as: dull grey and white reflective. The reflectivity is related to a marked enrichment of FeO and NiO and depletion of Cr₂O₃, MgO, and Al₂O₃, resulting in the formation of spinelloid composition that lies between the end-members of FeCr₂O₄ (chrome-magnetite) and Fe₃O₄ (magnetite). Chromite replacement by ferritchromit/chrome-magnetite/magnetite usually takes place from grain boundaries or micro-cracks and fractures inwards giving rise to altered grains consisting of mostly relict chromite cores enveloped by thin ferritchromit and variably thick chrome-magnetite/magnetite rind. Progressive increase in Cr# and drastic decrease in Mg# from grey core to white reflective mantle suggests post-formation fracturing. The ferritchromit and its associated spinel phases in the Sukinda ultramafic rocks are attributed to elemental exchange and its variable precipitation during serpentinisation and represent alteration products formed through progressive, fluid-driven recrystallisation during regional tectonothermal events below 500°C.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"1943-1962"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-Wave Infrared Spectral Characteristics of the Mamupu Cu-Au Skarn Deposit in Eastern Tibet: Insights Into Exploration and Evaluation","authors":"Xiaoxu Zhang,&nbsp;Bin Lin,&nbsp;Liang He,&nbsp;Qin Wang,&nbsp;Rui Shao,&nbsp;Qiu Du,&nbsp;JingJing Dai","doi":"10.1002/gj.70078","DOIUrl":"https://doi.org/10.1002/gj.70078","url":null,"abstract":"<div>\u0000 \u0000 <p>The Mamupu deposit is recognised as the inaugural skarn-type Cu-Au deposit identified within the southern segment of the Yulong porphyry copper belt (YPCB) in Tibet, which contains 0.28 Mt Cu with an average grade of 0.85% and 19.6 t Au with an average grade of 0.60 g/t. The relationship between alteration and mineralization is of considerable significance for the exploration of deep and surrounding ore deposits. This study elucidates the alteration and mineralization characteristics of the deposit through comprehensive geological mapping of alterations, logging of drill holes and short-wave infrared (SWIR) spectroscopy. Detailed geological mapping of surface alterations indicates that intense silicification and hornfels alteration are predominantly located within the central mining area, which is proximal to the location of deep ore bodies. The spatial distribution of chlorite alteration closely aligns with the locations of the ore bodies, thereby serving as an effective indicator of ore body occurrence. Results from drill hole logging and SWIR analysis reveal that skarn alteration minerals, such as diopside, garnet, phlogopite and actinolite, are directly associated with copper-polymetallic mineralization, while chlorite alteration is consistently observed across the drill holes. In terms of SWIR spectral characteristics, the Fe-OH characteristic absorption peak (Pos2250) of chlorite associated with porphyry-type alteration diminishes from the No. VII copper-polymetallic ore body towards the periphery. This trend effectively reflects the distance from the hydrothermal mineralization centre: chlorite located near the ore body is relatively Fe-rich, whereas that situated further away is comparatively Mg-rich. Notably, the Pos2250 value of chlorite within the skarn alteration does not exhibit a distinct spatial pattern. Although the Al-OH characteristic absorption peak (Pos2200) of montmorillonite–muscovite group minerals also decreases outward from the ore body, its interpretative significance is limited in this deposit due to the inherent differential alteration zoning characteristic of skarn-type deposits. Consequently, elevated Pos2250 values of chlorite (&gt; 2250.0 nm) within porphyry-type alteration, in conjunction with the presence of abundant skarn mineral assemblages, are identified as effective exploration indicators for the mineralization centre of the Mamupu deposit. For future exploration in the southern YPCB, we advocate for a comprehensive research approach that integrates geology, spectroscopy and genetic analysis: delineating alteration zones through geological mapping, targeting mineralization centres using spectral parameters and interpreting genetic models through comparative geological analysis. This methodology is anticipated to facilitate advancements in the exploration of deep and peripheral regions.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2087-2105"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative Evaluation of Deep Coalbed Methane Content: A Logging Data-Driven Approach","authors":"Yusong Ji,&nbsp;Song Li,&nbsp;Wei Hou,&nbsp;Yongzhou Li,&nbsp;Peng Feng,&nbsp;Shizhuang Yang,&nbsp;Hanmiao Zhou","doi":"10.1002/gj.70077","DOIUrl":"https://doi.org/10.1002/gj.70077","url":null,"abstract":"<div>\u0000 \u0000 <p>Accurate evaluation of gas content in deep coal seams is essential for estimating coal-bed methane reserves and enabling efficient development. Conventional gas content prediction methods primarily target adsorbed gas, rendering them unsuitable for deep coal reservoirs with abundant free gas. This study introduces a novel approach to calculate deep gas content based on logging data. The No. 8 coal seam of the Benxi Formation, situated on the deep eastern margin of the Ordos Basin in the Daning–Jixian Block, serves as the research subject. Multiple regression analysis was employed to model the relationships between logging parameters and Langmuir volume, Langmuir pressure, porosity and water saturation. A logging model for gas content was constructed using the Langmuir equation and the ideal gas law. Four machine learning methods—BP neural network, multiple linear regression, random forest and support vector machine—were utilised to construct a total gas content evaluation model. Errors of the machine learning models were evaluated, and the random forest model was identified as the optimal choice. A comparison between predicted gas content and measured pressure coring results indicates that both the logging and RF models are efficient, accurate and effective. However, the logging model demonstrates superior accuracy compared to the RF model. The logging-based gas content evaluation method exhibits strong adaptability in the deep sections of the study area, facilitating subsequent geological assessments and resource potential analyses of deep coal reservoirs.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 7","pages":"2072-2086"},"PeriodicalIF":2.6,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}