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Exploring the Driving Mechanisms Behind Variations in 87Sr/86Sr Ratios in Neoproterozoic–Cambrian Oceans 新元古代-寒武纪海洋87Sr/86Sr比值变化的驱动机制探讨
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2026-03-16 Epub Date: 2025-06-16 DOI: 10.1002/gj.70005
Guanghao Peng, Yuyue Han, Bo Ran, Shugen Liu, Tong Sun, Zhiwu Li
{"title":"Exploring the Driving Mechanisms Behind Variations in 87Sr/86Sr Ratios in Neoproterozoic–Cambrian Oceans","authors":"Guanghao Peng,&nbsp;Yuyue Han,&nbsp;Bo Ran,&nbsp;Shugen Liu,&nbsp;Tong Sun,&nbsp;Zhiwu Li","doi":"10.1002/gj.70005","DOIUrl":"https://doi.org/10.1002/gj.70005","url":null,"abstract":"<div>\u0000 \u0000 <p>The long-term evolution of seawater strontium isotope ratios (<sup>87</sup>Sr/<sup>86</sup>Sr) serves as a critical archive for reconstructing paleogeographic configurations, climatic shifts, and biological evolution. However, the driving mechanisms behind <sup>87</sup>Sr/<sup>86</sup>Sr variations during the Neoproterozoic–Cambrian transition (700–500 Ma) remain debated, owing to the interplay of multiple geological processes including supercontinental fragmentation, amalgamation, orogenic activity, and volcanic events. This study analyses 486 <sup>87</sup>Sr/<sup>86</sup>Sr measurements from global marine carbonates spanning 700–500 Ma, integrated with temporal records from 89 orogenic belts worldwide. The refined seawater <sup>87</sup>Sr/<sup>86</sup>Sr curve reveals a three-phase ascending trend: 700–635 Ma: The breakup of Rodinia and the simultaneous assembly of Gondwana created a low marine <sup>87</sup>Sr/<sup>86</sup>Sr ratio, yet it still exhibited an upward trend. 635–540 Ma: Progressive ratio increases align with the Gondwana supercontinent assembly, driven by intensified orogenic uplift that exposed radiogenic continental crust to weathering. 540–500 Ma: Accelerated ratio elevation correlates with final Gondwana block amalgamation, volcanic degassing, and greenhouse-induced climatic conditions that amplified continental silicate weathering fluxes. This phased model highlights pre-Cambrian orogenesis as a pivotal precursor to the Cambrian Explosion. The convergence of Gondwana continental blocks, coupled with Cambrian greenhouse climates, dramatically enhanced terrestrial weathering efficiency. The resultant surge in nutrient delivery (e.g., phosphorus) to oceans likely created biogeochemical thresholds critical for triggering the Cambrian biospheric radiation. These findings establish tectonically mediated weathering-climate feedbacks as central regulators of Earth's biogeochemical transitions during this pivotal interval.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 3","pages":"710-724"},"PeriodicalIF":2.2,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147566186","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}
引用次数: 0
Comment on ‘On the Transition From Remnant Tethys Sea to Foreland Basin During the Late Paleogene in the Western Himalayas, Pakistan’ by Ali et al. (2025) 评Ali et al.(2025)《论巴基斯坦西喜马拉雅地区晚古近纪从残余特提斯海到前陆盆地的过渡》
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2026-03-16 Epub Date: 2026-02-24 DOI: 10.1002/gj.70230
Mohd Younus Bhat, Nurul Absar
{"title":"Comment on ‘On the Transition From Remnant Tethys Sea to Foreland Basin During the Late Paleogene in the Western Himalayas, Pakistan’ by Ali et al. (2025)","authors":"Mohd Younus Bhat,&nbsp;Nurul Absar","doi":"10.1002/gj.70230","DOIUrl":"https://doi.org/10.1002/gj.70230","url":null,"abstract":"<div>\u0000 \u0000 <p>Ali et al. (2025) present an integrated sedimentological and biostratigraphic analysis of late Paleogene sediments from the Sulaiman fold-thrust belt (SFTB), Pakistan, documenting the transition from remnant Tethys Sea to the Himalayan foreland basin. While this study provides valuable field observations and a comprehensive stratigraphic framework, we identify several significant technical issues that affect the interpretation of depositional environments, biostratigraphic age assignments, and the relative roles of tectonic versus eustatic controls on the retreat of the Tethys Sea. These issues warrant clarification to ensure accurate paleogeographic and tectonic reconstructions for this critical region.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 3","pages":"848-851"},"PeriodicalIF":2.2,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568279","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}
引用次数: 0
Special Issue “Energy, Resources and Climate Change”—An Introduction 特刊“能源、资源与气候变化”简介
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-10-27 DOI: 10.1002/gj.70097
Yasir Ahmed Solangi, Cosimo Magazzino, Dhafer Almakhles, Nayyar Hussain Mirjat, Sharafat Ali
{"title":"Special Issue “Energy, Resources and Climate Change”—An Introduction","authors":"Yasir Ahmed Solangi,&nbsp;Cosimo Magazzino,&nbsp;Dhafer Almakhles,&nbsp;Nayyar Hussain Mirjat,&nbsp;Sharafat Ali","doi":"10.1002/gj.70097","DOIUrl":"https://doi.org/10.1002/gj.70097","url":null,"abstract":"<div>\u0000 \u0000 <p>The twenty-first century's energy–resources–climate nexus is reshaping how societies produce power, manage natural assets, and respond to escalating environmental risks. Meeting Paris Agreement and SDG ambitions demands innovations that are technical (from digitalization to novel energy systems), institutional (finance and governance), and methodological (advanced decision-support and integrated assessments). This special issue gathers 16 contributions spanning these fronts, empirically grounded studies, and new frameworks that together illuminate practical pathways toward lower emissions, fairer energy access, and more resilient resource systems. The 16 papers are grouped under the following five headings: (1) renewable energy, resource efficiency, and climate action; (2) digitalization, finance, and innovation; (3) resource characterisation and environmental management; (4) Geohazards, drought, and climate resilience; and (5) novel energy technologies and climate dynamics.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 11","pages":"2595-2597"},"PeriodicalIF":2.2,"publicationDate":"2025-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145555716","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}
引用次数: 0
Assessment of Drought Projections Using the Integrated Fuzzy Analytical Hierarchy Process 基于综合模糊层次分析法的干旱预测评价
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-07-29 DOI: 10.1002/gj.70041
Prem Kumar, Shoaib Ahmed Khatri, Syed Feroz Shah, Mohammad Aslam Uqaili, Nayyar Hussain Mirjat, Laveet Kumar
{"title":"Assessment of Drought Projections Using the Integrated Fuzzy Analytical Hierarchy Process","authors":"Prem Kumar,&nbsp;Shoaib Ahmed Khatri,&nbsp;Syed Feroz Shah,&nbsp;Mohammad Aslam Uqaili,&nbsp;Nayyar Hussain Mirjat,&nbsp;Laveet Kumar","doi":"10.1002/gj.70041","DOIUrl":"https://doi.org/10.1002/gj.70041","url":null,"abstract":"<div>\u0000 \u0000 <p>Effective mitigation planning has become essential considering the complexity and ambiguity of the drought. The Fuzzy analytical hierarchy process (Fuzzy-AHP) and a comparison matrix method are the key elements of this research's framework for planning drought mitigation for the Tharparkar desert region in Pakistan. Fuzzy-AHP, an efficient decision-making tool, offers systematic evaluation based on survey questionnaire criteria. It was created through a literature review and has received feedback from 40 various stakeholders. The identification of the criteria, the fuzzy-AHP model, consistency analysis, weight aggregation, assessment of the alternatives, ranking, and selection are the crucial steps in the technique suggested by this study. This approach, which offers a reliable and flexible framework for planning drought mitigation, incorporates the Fuzzy-AHP model and a comparison matrix. As it can handle confusing and subjective inputs, decision-makers can use it to identify drought situations, evaluate them, and select the best drought mitigation strategies. This research serves to improve the efficacy of drought mitigation planning processes across a range of sectors by offering a thorough and flexible decision-support tool.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 11","pages":"2890-2909"},"PeriodicalIF":2.2,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145555669","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}
引用次数: 0
Modelling CO 2 Emissions Through Econometric and Machine Learning Approaches: The Role of Renewable Energy and Resource Use in Climate Action 通过计量经济学和机器学习方法模拟二氧化碳排放:可再生能源和资源利用在气候行动中的作用
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-07-29 DOI: 10.1002/gj.70038
Tulia Gattone, Alberto Costantiello, Angelo Leogrande, Angelo Quarto
{"title":"Modelling CO\u0000 2 Emissions Through Econometric and Machine Learning Approaches: The Role of Renewable Energy and Resource Use in Climate Action","authors":"Tulia Gattone,&nbsp;Alberto Costantiello,&nbsp;Angelo Leogrande,&nbsp;Angelo Quarto","doi":"10.1002/gj.70038","DOIUrl":"https://doi.org/10.1002/gj.70038","url":null,"abstract":"<div>\u0000 \u0000 <p>This research delves into the complex relationships among carbon dioxide (CO<sub>2</sub>) emissions, resource use, and energy consumption, showing how renewable energy adoption and reliance on fossil fuels shape greenhouse gas emissions. Leveraging panel data from 120 countries over a 10-year span, the analysis combines econometric approaches, including Weighted Least Squares (WLS), Generalised Linear Models (GLM) and Generalised Additive Models (GAM), with machine learning techniques such as Multivariate Adaptive Regression Splines (MARS) to capture nonlinear dynamics. Robustness checks are conducted using bagging, boosting, and Support Vector Machines (SVM) algorithms. Our analysis reveals strong associations between CO<sub>2</sub> emissions and key factors such as fossil fuel energy consumption, methane emissions, and renewable energy use. These results underscore the critical need for a global shift toward renewable energy systems, enhanced resource management, and well-targeted policy interventions. By employing cutting-edge methodologies, this study suggests harmonising economic growth with sustainability objectives and advancing climate change mitigation efforts.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 11","pages":"2867-2889"},"PeriodicalIF":2.2,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145555668","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}
引用次数: 0
Late Palaeozoic Convergence and Accretion in the Southern Margin of Central Asian Orogenic Belt: Constraints From the Carboniferous-Permian Magmatism in the Zhangfangshan Area 中亚造山带南缘晚古生代辐合与增生:张房山地区石炭-二叠纪岩浆作用的制约
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-07-28 DOI: 10.1002/gj.5182
Jian Tian, Junhong Zhao, Houtian Xin, Xuejian Teng, Zhongyu Meng, Guozhen Zhang
{"title":"Late Palaeozoic Convergence and Accretion in the Southern Margin of Central Asian Orogenic Belt: Constraints From the Carboniferous-Permian Magmatism in the Zhangfangshan Area","authors":"Jian Tian,&nbsp;Junhong Zhao,&nbsp;Houtian Xin,&nbsp;Xuejian Teng,&nbsp;Zhongyu Meng,&nbsp;Guozhen Zhang","doi":"10.1002/gj.5182","DOIUrl":"https://doi.org/10.1002/gj.5182","url":null,"abstract":"<div>\u0000 \u0000 <p>The Central Asia Orogenic Belt (CAOB), the largest accretionary orogenic belt in the world, has a complex history. Carboniferous–Permian magmatism in the Zhangfangshan area of China is the key to understanding the accretion orogeny and reconstructing the orogenic belt structure in the southern Beishan Orogenic Belt, which is a part of the southern margin of the CAOB. The Zhangfangshan complex is exposed in the southeast of the Beishan area and includes plagiogranite, quartz diorite, siliceous rocks, limestone, and metamorphic sandstones. We obtained weighted mean zircon <sup>206</sup>Pb/<sup>238</sup>U ages of 351 ± 2 Ma and 338 ± 3 Ma from plagiogranite and quartz diorite in the complex, respectively. The plagiogranite yields clear negative Nb–Ta anomalies on a trace element spider diagram and ε<sub>Hf</sub>(<i>t</i>) values of +14.8 to +20.1, characteristic of depleted mantle. These results indicate that the Zhangfangshan ophiolite was formed during the early Mississippian. The quartz diorites have similar trace element and Hf isotopic compositions to O-type adakites and high-Mg diorites, implying the partial melting of subducted oceanic crust. The undeformed granodiorite porphyrite and diabase that intrude the Zhangfangshan complex yield mean <sup>206</sup>Pb/<sup>238</sup>U ages of 270 ± 1 Ma and 250 ± 1 Ma, respectively, suggesting that the ocean basin represented by the Zhangfangshan ophiolite was closed before ~ 270 Ma. The diorite–granodiorite porphyrites have low Mg# (42.8–46.1) and positive ε<sub>Hf</sub>(<i>t</i>) values (+4.7 to +10.0), suggesting that they were generated from juvenile crust. The diabases have geochemical characteristics similar to the diorite porphyrite and have evolved ε<sub>Hf</sub>(<i>t</i>) values (−0.5 to +11.7) that may be related to crust–mantle mixing in their source. Based on our results and previous findings, we reveal the Late Palaeozoic evolutionary process in the southern Beishan orogenic belt.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 10","pages":"2464-2484"},"PeriodicalIF":2.2,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145297600","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}
引用次数: 0
Apatite and Whole-Rock Chemistry of Matrix in Volcanic Carbonatite Breccia From Outer Breccia of Amba Dongar Carbonatite Complex, Gujarat, India 印度古吉拉特邦安巴东加尔碳酸岩杂岩外角砾岩火山碳酸岩角砾岩中基质磷灰石及全岩化学
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-07-15 DOI: 10.1002/gj.70037
Sunit Mohanty, Arundhuti Ghatak, Vishal Nareda, Chiranjeeb Chatterjee, Victor A. Zaitsev
{"title":"Apatite and Whole-Rock Chemistry of Matrix in Volcanic Carbonatite Breccia From Outer Breccia of Amba Dongar Carbonatite Complex, Gujarat, India","authors":"Sunit Mohanty,&nbsp;Arundhuti Ghatak,&nbsp;Vishal Nareda,&nbsp;Chiranjeeb Chatterjee,&nbsp;Victor A. Zaitsev","doi":"10.1002/gj.70037","DOIUrl":"https://doi.org/10.1002/gj.70037","url":null,"abstract":"<div>\u0000 \u0000 <p>Volcanic carbonatitic breccia is the most voluminous carbonatite formation found in the Amba Dongar Complex (ADC). These breccias are present in both the inner ring dyke as well as the northwestern region of Mongra-Padvani, referred to as the outer breccia. This study presents the mineral chemistry of apatite along with whole-rock geochemistry of the matrix from volcanic carbonatitic breccia of the Padvani region from ADC. The breccias are matrix-supported with few carbonatitic clasts of ADC. Apatites are found in the groundmass and display a morphology and chemistry that are distinct compared to apatites from the coherent carbonatites of the ADC, and have significantly larger concentrations of rare earth elements. The trace element concentration of the carbonatitic matrix closely resembles that of ADC, with anomalously high Nb (290–960 ppm) linked to a significant presence of pyrochlore supergroup minerals. REE-bearing phases include monazite and pyrochlore group of minerals with minor parisite-Ce. The samples also exhibit high (La/Yb)<sub>CN</sub> values (~42), and moderate (La/Sm)<sub>CN</sub> values (~7), with similar REE patterns compared to the ADC carbonatites. The integrated study of petrography, whole-rock geochemistry, and mineral chemistry suggests that the Mongra-Padvani region is a secondary eruption centre in the northwestern region of ADC. An emplacement model is presented for the origin of the outer breccia. In addition, the present study highlights the economic relevance of carbonatitic breccia in the ADC, emphasising their potential as hosts for REE mineralisation. The significant concentration levels observed in these rocks suggest promising avenues for mining endeavours.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 8","pages":"1885-1908"},"PeriodicalIF":2.2,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815128","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}
引用次数: 0
Critical Mineral Resources for Future Green Energy: Understanding Formation Mechanisms and Processing Technologies—Introduction 未来绿色能源的关键矿产资源:了解形成机制和加工技术-导论
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-07-02 DOI: 10.1002/gj.70022
Fei Xue, Xiying Zhang, Xiaocan Yu, Yuanyi Zhao, Huawen Cao
{"title":"Critical Mineral Resources for Future Green Energy: Understanding Formation Mechanisms and Processing Technologies—Introduction","authors":"Fei Xue,&nbsp;Xiying Zhang,&nbsp;Xiaocan Yu,&nbsp;Yuanyi Zhao,&nbsp;Huawen Cao","doi":"10.1002/gj.70022","DOIUrl":"https://doi.org/10.1002/gj.70022","url":null,"abstract":"<div>\u0000 \u0000 <p>The global shift toward low-carbon energy technologies has significantly increased the demand for critical minerals such as lithium, rare earth elements (REEs) and helium. This special issue “Critical minerals” brings together 19 original research articles and review papers that address recent advances in both extraction technologies and the geological understanding of critical mineral deposits. The first section focuses on innovative recovery methods for lithium and REEs from sources such as electronic waste and salt lake brines, with promising industrial applications reported in China, Algeria and India. It also includes a study on optimising carbon capture and storage through improved source-sink matching. The second section investigates ore-forming processes and exploration strategies for hard-rock and brine-type deposits, including pegmatite-hosted lithium, carbonatite-related REEs, sandstone-hosted uranium, quartz-vein tungsten and porphyry copper deposits. Several studies from the Qinghai-Tibet Plateau offer new insights into lithium enrichment mechanisms in geothermal and saline environments, using geochemical and isotopic methods. Additionally, a new model for helium accumulation in shale gas reservoirs highlights the structural controls on gas migration and trapping. Collectively, these contributions advance our understanding of mineralizing processes in diverse geological settings and support the sustainable development of critical mineral resources essential for the global energy transition.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 8","pages":"1771-1774"},"PeriodicalIF":2.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814968","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}
引用次数: 0
Assessment of Late Miocene Reservoirs: Geophysical and Petrophysical Perspectives on Unconventional Gas in the Nidoco Field, Nile Delta, Egypt 晚中新世储层评价:埃及尼罗河三角洲Nidoco气田非常规天然气的地球物理和岩石物理观点
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-06-19 DOI: 10.1002/gj.5245
Mohamed Fathy, Mohamed Reda, Mohamed I. Abdel-Fattah, Mohamed Sadoun, Abdelmoneam Raef, Khaled Al-Kahtany, Sherif Farouk
{"title":"Assessment of Late Miocene Reservoirs: Geophysical and Petrophysical Perspectives on Unconventional Gas in the Nidoco Field, Nile Delta, Egypt","authors":"Mohamed Fathy,&nbsp;Mohamed Reda,&nbsp;Mohamed I. Abdel-Fattah,&nbsp;Mohamed Sadoun,&nbsp;Abdelmoneam Raef,&nbsp;Khaled Al-Kahtany,&nbsp;Sherif Farouk","doi":"10.1002/gj.5245","DOIUrl":"https://doi.org/10.1002/gj.5245","url":null,"abstract":"<div>\u0000 \u0000 <p>This study evaluates the hydrocarbon potential of the Late Miocene section in Nidoco Field (Central Nile Delta) through integrated petrophysical and pressure data analysis. Key reservoir units—Level-2, Level-3, Level-3A, Level-3 Lower, Unit-A and Unit-B—exhibit superior reservoir quality, characterised by high effective porosity (Øeff) and gas saturation (Shr). Lithological analysis reveals sandstone and shale as the dominant facies, with laminated-to-dispersed montmorillonite-rich shales influencing reservoir heterogeneity. Iso-parametric maps demonstrate lateral variations in shale content (<i>V</i><sub>sh</sub>), porosity, and hydrocarbon distribution, highlighting compartmentalised flow units. Reservoir pressure data identify five hydraulically isolated compartments, confirming dynamic gas reservoir behaviour and validating the geological model. The integration of well-log interpretations with pressure measurements reveals distinct pressure regimes correlating with lithological boundaries, improved porosity-permeability relationships through NMR-enhanced analysis, and optimal reservoir zones in Level-3 and Unit-B with Øeff &gt; 18% and Shr &gt; 65%. Results indicate substantial untapped potential, particularly in the central and eastern field sectors where reservoir quality peaks. The study's geological model successfully guided recent gas discoveries, demonstrating the effectiveness of combining petrophysical and dynamic data. The study recommends prioritising development drilling in Level-3A and Unit-A (highest gas saturation), implementing targeted stimulation in compartment boundaries to enhance connectivity, in addition to expanding exploration north-westward where pressure data suggest reservoir continuity. This workflow provides a template for evaluating similar deltaic reservoirs, emphasising the critical role of integrated static-dynamic characterisation in unlocking complex hydrocarbon systems.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 2","pages":"509-528"},"PeriodicalIF":2.2,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147280095","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}
引用次数: 0
Lithofacies Characteristics of Marine Shale and Its Influence on Pore Structure: A Case Study of Lower Silurian Longmaxi Formation in Changning Area, Southern Sichuan Basin, China 海相页岩岩相特征及其对孔隙结构的影响——以川南长宁地区下志留统龙马溪组为例
IF 2.2 4区 地球科学
Geological Journal Pub Date : 2025-06-12 DOI: 10.1002/gj.70009
Zhao Yinan, Zhou Wen, Liu Weiqing
{"title":"Lithofacies Characteristics of Marine Shale and Its Influence on Pore Structure: A Case Study of Lower Silurian Longmaxi Formation in Changning Area, Southern Sichuan Basin, China","authors":"Zhao Yinan,&nbsp;Zhou Wen,&nbsp;Liu Weiqing","doi":"10.1002/gj.70009","DOIUrl":"https://doi.org/10.1002/gj.70009","url":null,"abstract":"<div>\u0000 \u0000 <p>Research on shale pore structure has advanced the understanding of shale gas occurrence, migration and enrichment mechanisms. However, the factors affecting shale pore structure are complex and contentious, limiting a comprehensive understanding of shale gas accumulation. This study focuses on the Longmaxi (LMX) Formation shale in the Changning area of southern Sichuan, utilising X-ray diffraction (XRD), organic geochemistry, thin section and scanning electron microscope (SEM) observation and nitrogen adsorption experiments to classify lithofacies types and examine how mineral composition and organic matter (OM) control pore structure and identify favourable shale reservoirs. The results show that the LMX Formation shale can be categorised into four different lithofacies: organic-rich siliceous shale (RS), organic-rich mixed shale (RM), organic-lean siliceous shale (LS) and organic-lean mixed shale (LM). The predominant pore types include OM pores and inorganic pores (mainly intergranular and intragranular pores), with mesopores contributing the majority of the total pore volume (PV) and specific surface area (SSA), accounting for approximately 70% and 80%, respectively. Characterised by high total organic carbon (TOC) content and well-developed OM pores, RS and RM exhibit larger PV and SSA, suggesting better resource potential compared to LS and LM. In these high-TOC shales, both SSA and PV show a strong positive correlation with TOC content and a negative correlation with clay mineral content. Conversely, in low-TOC shales, SSA and PV are positively correlated with clay mineral content while the correlation with TOC diminishes. There is a tight intrinsic relationship between lithofacies characteristics and pore structure.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 11","pages":"2825-2844"},"PeriodicalIF":2.2,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145555700","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}
引用次数: 0
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