Journal of Asian Earth Sciences最新文献

{"title":"Present-day geothermal regime of the Junggar Basin, northwest China: Implication for hydrocarbon distribution and geothermal resources","authors":"Chenxing Li ,&nbsp;Jian Chang ,&nbsp;Nansheng Qiu ,&nbsp;Huajun Guo ,&nbsp;Xiang Shan ,&nbsp;Bo Peng ,&nbsp;Jiabo Xu ,&nbsp;Ze Zhang","doi":"10.1016/j.jseaes.2025.106540","DOIUrl":"10.1016/j.jseaes.2025.106540","url":null,"abstract":"<div><div>The geothermal regime not only reflects the basin’s evolutionary history but also controls the formation of both fossil energy and geothermal resources. The deep geothermal characteristics of the Junggar Basin in northwestern China have remained unclear due to limited temperature data. In this study, we collected new temperature data from over 450 boreholes drilled in the past decade to investigate the geothermal gradient, heat flow, formation temperatures at depths of 5 to 10 km, and the thermal structure of lithosphere. The results show that the geothermal gradient ranges from 14.0 to 29.8℃/km, with an average of 20.7℃/km, and heat flow ranges from 32.7 and 68.5 mW/m², averaging 45.8 mW/m². Heat flow varies between uplifts and depressions, influenced by basement relief, with further regional variation in the north and south due to basement lithology and faults. The ratio of crust to mantle heat flow and the thermal lithosphere thickness across different tectonic units ranges from 0.74 to 1.92 and 150 to 270 km, respectively, confirming the basin’s stable tectonic background. Formation temperatures at 10 km depth ranges from 155℃ to 311℃, increasing from the center to the basin’s margins. These findings suggest that oil can be found at depths of 8000 m in the Central Depression, while high-temperature geothermal resources are present around 5000 m in the Eastern Uplift. This study provides a comprehensive understanding of the geothermal regime and valuable insights for future resource exploration in the Junggar Basin.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"284 ","pages":"Article 106540"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagenetic and mineralogical impacts on clastic reservoir; A case study from the lower Indus Basin, Pakistan","authors":"Muhammad Nofal Munir ,&nbsp;Mohammad Zafar ,&nbsp;Muhsan Ehsan ,&nbsp;Rujun Chen ,&nbsp;Kamal Abdelrahman ,&nbsp;Jar Ullah ,&nbsp;Tassawar Hayat ,&nbsp;Hamad Ur Rahim","doi":"10.1016/j.jseaes.2025.106539","DOIUrl":"10.1016/j.jseaes.2025.106539","url":null,"abstract":"<div><div>The Pab Sandstone, a significant and heterogeneous hydrocarbon development target in Pakistan’s Lower Indus Basin, offers a unique opportunity to investigate diagenetic and depositional controls on reservoir quality. A substantial uncertainty in reservoir quality assessment pertains to diagenetic effects. An integrated approach, including detailed petrographic analysis, scanning electron microscopy, X-ray diffraction, helium porosity, and permeability measurements, was used to analyze the impact of identified diagenetic elements on reservoir quality. Visual core investigations show deposition within a semi-arid, highly sand-prone coastal–alluvial braided plain under the periodic weak marine influence. The presence of trough-shaped crossbedding, large bedform structures, bioturbation, and some fossils in selective horizons indicate near-shore channel environments. The channel sandstones range from very fine to very coarse-grained quartz arenites. Analysis of some core samples shows an abundance of quartz arenites and kaolinite as the major authigenic clay minerals. Core-derived porosity and permeability were found to be 6.34 % and 69.90 mD, respectively. Main diagenetic processes include compaction, quartz overgrowth, calcite cementation, and authigenic kaolinite. Reservoir properties are strongly facies-dependent and are related to depositional texture, detrital mineralogy, together with their diagenetic overprint. Sandstones are typically very clean, with secondary porosity, which is associated with partial leaching of mudclasts, feldspars, and dissolution of volcanic rock fragments. Permeability exhibits a positive correlation with increasing grain size in the quartzose sandstones. Porosity decreases with poorer sorting. The research findings can be utilized to understand the complications of sandstone reservoirs and develop better exploration strategies minimizing the economic losses associated with non-productive wells.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106539"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural controls on the magma emplacement and distribution of sulfide orebodies in the Kalatongke Cu-Ni sulfide district, NW China","authors":"Xue-Hai Wang ,&nbsp;Ke-Zhang Qin ,&nbsp;Xing-Wang Xu ,&nbsp;Dong-Mei Tang ,&nbsp;Ya-Jing Mao ,&nbsp;Lei Zhang ,&nbsp;Min-Qiang Zhang ,&nbsp;Fang-Lin Yuan ,&nbsp;Yi Li","doi":"10.1016/j.jseaes.2025.106538","DOIUrl":"10.1016/j.jseaes.2025.106538","url":null,"abstract":"<div><div>Recent advances have significantly enhanced our understanding of the magma source, magma evolution, and sulfur saturation mechanisms of the Kalatongke Cu-Ni sulfide deposit in the Central Asian Orogenic Belt. However, limited systematic research has explored the structures that are critical to magma emplacement and sulfide accumulation. In this study, we perform a systematic multiscale analysis of the lithofacies distribution, morphology, and structural relationships between the northern and southern belts of the Kalatongke deposit. We propose that the emplacement and distribution of mafic intrusions and associated sulfide orebodies were controlled by fractures through <em>syn</em>-dextral shear deformation. The geometry of the Y1 and western Y2 intrusions and their mineralization were predominantly controlled by extensional T-fractures resulting from <em>syn</em>-shear deformation, whereas the eastern Y2 and Y3 intrusions were primarily governed by horizontal compressive-slip C-fractures, along with Riedel R and R’ fractures. In the northern belt, the Y7 intrusion and its mineralization were influenced by shear between two sets of horizontal fractures trending northeast, which are nearly perpendicular to the main fault orientation of the southern and northern belts. Based on the characteristics of the fractures and the distribution of orebodies across the northern and southern belts, we propose that the Kalatongke deposit was controlled by a negative flower structure, suggesting the presence of deep structural connectivity between the northern and southern belts. Moreover, the distribution pattern of the sulfide orebodies in the Kalatongke deposit was governed primarily by the structures and their associated stress regimes.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106538"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of Jurassic granitoids from the Yanshan orogenic belt: Implications for crustal evolution in the northern North China Craton","authors":"Zeguang Chang ,&nbsp;Guochen Dong ,&nbsp;Xuanxue Mo ,&nbsp;Guang Miao ,&nbsp;Zhiwei Shi","doi":"10.1016/j.jseaes.2025.106535","DOIUrl":"10.1016/j.jseaes.2025.106535","url":null,"abstract":"<div><div>This study presents new geochronological and geochemical data for the Wangpingshi granite (WG) and Yuerya granite (YG) from the Yanshan orogenic belt, aiming to reveal their petrogenesis and source characteristics. Zircon U–Pb dating of the WG and YG plutons indicates formation ages of 171 Ma and 168 Ma, respectively. These granites are high-K calc-alkaline I-type granites, characterized by high SiO₂ and low P₂O₅ contents, enrichment in Rb, Th, U, and Pb, depletion in Nb, Ta, Ti, and P, with low Nb/U, Nb/Ta, and Zr/Hf ratios. They exhibit initial ⁸⁷Sr/⁸⁶Sr ratios of 0.7045–0.7063, ε_Nd(t) values of −12.28 to −11.36, and zircon ε_Hf(t) values of −14.65 to −9.19. These geochemical and isotopic characteristics suggest that the granites originated from partial melting of a modified crustal source comprising both juvenile and ancient crustal components. Petrogenetic modeling indicates that the WG magma formed under pressures of 12.5–13 kbar with a garnet-bearing amphibolite residue, while the YG magma formed under pressures of 9–10 kbar with a plagioclase-dominated amphibolite residue. The source characteristics of the granites indicate that the lower crust underwent significant modification through magma underplating before the Jurassic, which likely weakened the crust and facilitated subsequent tectonic deformation. This research provides a lower age limit of 170–168 Ma for constraining the initiation of episode A of the Yanshanian Movement.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106535"},"PeriodicalIF":2.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of post-collisional felsic rocks and implications for continental growth: Insights from a Paleogene monzonitic intrusion, southeastern Tibetan Plateau","authors":"Hao Liu ,&nbsp;Zheng Liu ,&nbsp;Guo-Chang Wang ,&nbsp;Shu-Cheng Tan","doi":"10.1016/j.jseaes.2025.106528","DOIUrl":"10.1016/j.jseaes.2025.106528","url":null,"abstract":"<div><div>It is unclear if substantial continental growth occurs after continent–continent collision. Paleogene magmatism immediately after the India–Asia collision produced widespread felsic intrusions in the southeastern Tibetan Plateau (TP) and<!--> <!-->these intrusions provide an excellent opportunity to study continental growth in a post-collisional setting. In this paper, we report new petrological and geochemical data for a representative intrusion, the Paleogene Weishan monzonitic intrusion in the Simao Block of the southeastern Tibetan Plateau. The quartz monzonite porphyries in the Weishan intrusion are geochemically similar to adakitic rocks. They have enriched Sr–Nd isotopic compositions, with (⁸⁷Sr/⁸⁶Sr)_i ratios of 0.7071–0.7072 and Ɛ_Nd(t) values from −4.0 to −3.5. These features are indicative of an origin of these rocks from melts that were produced by the interaction between melts derived from delaminated lower crust and overlying mantle peridotite. The geochemical similarities between the Weishan intrusion and coeval felsic rocks in the southeastern TP suggest a common origin. Detailed quantitative modeling demonstrates that only a small amount of mantle component (less than 20 %) was involved in the formation of these rocks, and at the same time, a large volume of the lower crust (with a thickness of roughly 10 km) was recycled into mantle by delamination. Therefore, we suggest that substantial continental growth might not have occurred in the southeastern TP region during the Paleogene after continent–continent collision.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"282 ","pages":"Article 106528"},"PeriodicalIF":2.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Cretaceous and Cenozoic denudation of northern Central Vietnam examined through apatite fission track analysis","authors":"Michael B.W. Fyhn ,&nbsp;Paul Green ,&nbsp;Bui H. Hoang ,&nbsp;Jussi Hovikoski ,&nbsp;Tran V. Tri ,&nbsp;Vung V. Phach ,&nbsp;Tonny B. Thomsen ,&nbsp;Henrik I. Petersen ,&nbsp;Mai H. Dam ,&nbsp;Jørgen A. Bojesen-Koefoed ,&nbsp;Ioannis Abatzis ,&nbsp;Lars H. Nielsen ,&nbsp;Christian Heine","doi":"10.1016/j.jseaes.2025.106524","DOIUrl":"10.1016/j.jseaes.2025.106524","url":null,"abstract":"<div><div>Tectonism is associated with uplift and exhumation but are commonly difficult to decipher due to large gaps in the stratigraphic record. Northern Central Vietnam has a highly dynamic exhumation and tectonic history affected by Middle Paleozoic and latest Permian to Triassic orogenies but also less known younger events. We explore this history through analysis of apatite fission tracks (AFT) together with stratigraphy and vitrinite reflectance, seismic data and new U/Pb zircon-ages. Late Cretaceous and Paleocene uplift and exhumation are here attributed to a poorly understood orogenic event. It was followed by mid- to Late Cenozoic doming and rift pulses and intervening periods of subsidence and basin development associated with regional SE Asian tectonism and establishment of South China Sea basins.</div><div>We document the evolution of NW-striking structural lineaments in northern Central Vietnam and their repeated reactivation. The complex Central Vietnamese fault block mosaic formed since the Paleozoic during different tectonic events associated with movements over these structural lineaments. Fault blocks were exhumed during Late Cretaceous and Cenozoic uplift phases, recorded by AFT in four discrete thermotectonic episodes around 82–70, 61–59, 43–42, and 19–15 Ma. The NW-striking crustal lineaments controlled deformation and uplift during Middle Paleozoic, latest Permian to Triassic and Late Cretaceous to Early Cenozoic orogenies. While the two former orogenies are well-known, the latter is poorly realized despite its super-regional nature across Indochina and SE China. It may relate to plate collision and the cessation of Paleo-Pacific subduction underneath SE Asia. Between the orogenic episodes, rifting reactivated the NW-striking crustal lineaments in the Carboniferous-Permian, Late Triassic and mid-Cenozoic causing basin development in Central Vietnam and neighboring areas. The mid-Cenozoic event led to the opening of the Hue Sub-basin at the Gulf of Tonkin margin. Uplift and one to one-and-a-half kilometer post-rift erosion sourced sediments to this sub-basin, including Upper Miocene petroleum reservoir sands.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"282 ","pages":"Article 106524"},"PeriodicalIF":2.7,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Provenance of Silurian sandstones in the South Kunlun terrane, West Kunlun (NW China) and the timing of the closure of the early Paleozoic Kudi-Qimanyute Ocean","authors":"Jie Zhang ,&nbsp;Yajun Xu ,&nbsp;Yiming Zhang ,&nbsp;Huxiang Yang ,&nbsp;Zihao Huang ,&nbsp;Kai Cao ,&nbsp;Xuguang Sha ,&nbsp;Xin Li ,&nbsp;Guocan Wang","doi":"10.1016/j.jseaes.2025.106527","DOIUrl":"10.1016/j.jseaes.2025.106527","url":null,"abstract":"<div><div>The West Kunlun Orogenic Belt (WKOB) records the early Palaeozoic subduction and accretion events related to the Proto-Tethys Ocean along the southwestern margin of the Tarim Block. The branch of the Proto-Tethys Ocean in the West Kunlun region is known as the Kudi-Qimanyute Ocean, whose consumption and closure have resulted in the collision between the North Kunlun terrane (NKT) and the South Kunlun terrane (SKT). However, the age and process of ocean closure have been widely debated. In this study, we present new U-Pb ages and Hf isotope data of detrital zircon and monazite from the Silurian sandstones at the northern margin of the SKT, which reveals a significant shift of sedimentary provenance, indicative of the transition in tectonic setting from a continental forearc to a collisional foreland basin. Provenance analysis indicates that detrital zircon age spectrum from the lower part of the sampled section shows an unimodal pattern and is dominated by early Paleozoic zircon grains derived from the SKT and the Tianshuihai Terrane (TSHT) magmatic arcs. In contrast, the ages of detrital zircons from the sample in the middle part of the section range from Neoproterozoic to Archean with prominent peaks at around 1.1 Ga, 1.4 Ga, and 1.6–1.8 Ga, which are interpreted to be recycled from older (meta)sedimentary rocks in the SKT and TSHT. This change reflects the burial of the magmatic arc beneath a prograding wedge of detritus, sourced from the advancing TSHT and SKT, as a result of the continental collision. Based on the depositional age of the Qaite Formation constrained by the youngest detrital monazite, as well as post-orogenic magmatism and sedimentary records in the region, the closure of the Kudi-Qimanyute Ocean can be constrained to the middle-late Silurian period (427–420 Ma). The detritus in the upper part of the section consists of varying amounts of early Paleozoic and Precambrian grains. The reappearance of late Neoproterozoic to early Paleozoic components is attributed to the re-exposure of the early arc rocks in the SKT and the TSHT during the collisional process. The abundant Archean to Mesoproterozoic detritus in the studied samples reflects the age and composition of the Precambrian basement of the SKT and TSHT. A comprehensive comparison of Precambrian detrital zircon U-Pb and Hf isotopic data indicates that SKT and TSHT share a basement affinity with Western Laurentia, suggesting they were likely part of Western Laurentia within the Rodinian supercontinent.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106527"},"PeriodicalIF":2.7,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detachment fault system in the Zedang ophiolite of southern Tibet: New insights into the evolution of the neo-Tethys ocean","authors":"Yuan Li ,&nbsp;Ruibao Li ,&nbsp;Chengjun Liu ,&nbsp;Jian Zhang ,&nbsp;Duoji Ciren ,&nbsp;Xiao Zhou ,&nbsp;Zhenkai He ,&nbsp;Jingsui Yang","doi":"10.1016/j.jseaes.2025.106525","DOIUrl":"10.1016/j.jseaes.2025.106525","url":null,"abstract":"<div><div>The Zedang ophiolite in the Yarlung Zangbo Suture Zone of southern Tibet provides crucial insights into the tectonic evolution of the Neo-Tethys Ocean. This study presents the first detailed characterization of a detachment fault system within the ophiolite, which primarily occurs along the southern boundary of peridotite massifs. The system is marked by serpentinite shear zones at the top of the mantle peridotite, forming a tectonic contact between the peridotite massifs and the overlying Bainang terrane. The structural, lithological, and deformation characteristics of the shear zone closely resemble those observed in oceanic core complexes at modern slow-spreading ridges and in Alpine ophiolites. Zircon U-Pb dating of an undeformed gabbro dike intruding the serpentinized peridotite (125.0 ± 0.4 Ma) and a basalt flow directly overlying the detachment fault (124.2 ± 1.0 Ma) indicates that Early Cretaceous magmatic activity occurred following the primary deformation and exhumation stage. Comparative analysis with the Xigaze ophiolite reveals heterogeneous development along the Neo-Tethys ridge system. While the Xigaze ophiolite formed at a slow- or ultraslow-spreading ridge with a more abundant magma supply, the Zedang ophiolite likely originated in a magma-deficient environment characterized by pronounced tectonic extension and episodic magmatism. These findings provide new constraints on the geodynamic processes that shaped the Neo-Tethys Ocean prior to the India–Asia collision.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106525"},"PeriodicalIF":2.7,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of pore structure before and after solvent extraction: A case study of lacustrine shales in the Triassic Chang 7 Formation, Ordos Basin, Northern China","authors":"Guanping Wang ,&nbsp;Zhijun Jin ,&nbsp;Qian Zhang ,&nbsp;Rukai Zhu ,&nbsp;Ruyue Wang ,&nbsp;Xianyang Liu ,&nbsp;Shixiang Li ,&nbsp;Tianjia Liu ,&nbsp;Xiaoyu Du ,&nbsp;Kouqi Liu","doi":"10.1016/j.jseaes.2025.106526","DOIUrl":"10.1016/j.jseaes.2025.106526","url":null,"abstract":"<div><div>The presence of hydrocarbons/bitumen in shales makes accurate characterization of reservoir properties challenging. Solvent extraction helps reveal the true pore structures and assess the movable oil distributions in early mature lacustrine shale oil reservoirs. In the present study, total organic carbon, optical microscopy, Rock-Eval pyrolysis, X-ray diffraction, scanning electron microscope, gas adsorption, and high-pressure mercury injection pressure experiments were performed to investigate the petrographic, geochemical and petrophysical characteristics of extracted and nonextracted shale samples that were collected from the Triassic Chang 7 Member in the Ordos Basin, China. The results revealed that changes in the micro-, meso-, and macropore volumes; specific surface area; average pore diameters and porosities of the shales significantly differ after solvent extraction compared with their original states, which indicates that the pore structures of early-mature, organic-rich shales are largely concealed by the retained oil and residual bitumen. Solvent extraction generally increases porosity by removing extractable organic matter (EOM), which occupies a sizeable pore space. Solvent extraction may, however, also be affected by several factors, resulting in reduced porosity. The main factors influencing the solvent extraction process are the removal of EOM, solvent–kerogen interactions, clay swelling, and the coupling effects of the sedimentary structure and pore system. In addition, the use of changes in porosity to indicate the movable oil content in shales is more meaningful than the changes in S₁ and total pore volume are. This study is beneficial for the accurate characterization of shale pore structures and precise assessments of the movable oil contents of lacustrine shales.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"282 ","pages":"Article 106526"},"PeriodicalIF":2.7,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of pre-seismic and coseismic continuous response of water level to the 2014 Ludian MS6.5 earthquake: A case study of Huize well","authors":"Huimin Kong ,&nbsp;Hongbiao Gu ,&nbsp;Haibin Wei","doi":"10.1016/j.jseaes.2025.106523","DOIUrl":"10.1016/j.jseaes.2025.106523","url":null,"abstract":"<div><div>Groundwater is sensitive to seismic and tectonic activity. Continuous response of well water levels pre-seismic and coseismic provides further evidence for the relationship between seismic activity and changes in water level. However, quantitatively analyzing factors such as crustal stress variations, aquifer deformation, pore pressure changes, and dynamic fluctuations in well water levels from seismogenesis to seismic rupture presents challenges due to their complex nature. Additionally, research on pre-seismic and coseismic response has been separated temporally due to different physical mechanisms and research objectives. In this study, pre-seismic and coseismic response are considered as continuous processes that involve a series of physical phenomena including stress–strain-pore pressure-water level changes before and during an earthquake event. This study aims to establish quantitative relationships between these response processes and hydrogeological parameters, as well as rock mechanical properties, thereby revealing the underlying physical mechanisms governing the continuous pre- and coseismic response of well water levels. A mathematical and numerical model was developed to continuously analyze the pre- and coseismic response of well water levels based on hydraulic-mechanical coupling near fault sections using near-field earthquakes under static stress as a case study. To validate the effectiveness of the numerical model, a simulation was conducted to replicate the continuous pre- and coseismic response of Huize well water levels during the Ludian earthquake. Through the design, identification, and correction of various parameter schemes, the simulated values align closely with measured water levels for both pre- and coseismic periods. This research holds significant practical implications for earthquake monitoring.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106523"},"PeriodicalIF":2.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}