Journal of Asian Earth Sciences: X最新文献

Iterative natural thresholding algorithm for seismic inversion aimed at potentially recovering geological interfaces characterized by weak reflection 弱反射地质界面反演的迭代自然阈值算法

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-05-23 DOI: 10.1016/j.jaesx.2025.100198

Zidan Fan , Ronghuo Dai , Yue Feng

{"title":"Iterative natural thresholding algorithm for seismic inversion aimed at potentially recovering geological interfaces characterized by weak reflection","authors":"Zidan Fan , Ronghuo Dai , Yue Feng","doi":"10.1016/j.jaesx.2025.100198","DOIUrl":"10.1016/j.jaesx.2025.100198","url":null,"abstract":"<div><div>Seismic inversion has developed into the core technology of quantitative prediction of rock’s elastic properties of underground in the exploration geophysics. In practical application, seismic impedance inversion is a frequently utilized technique. But it still has unsatisfactory protection of small reflectivity series in real seismic data. These small reflectivity series correspond to the weak reflections of geological interfaces, which is usually a sign of low acoustic impedance contrast in tunnels engineering or reservoirs of oil and gas in petroleum engineering, and other strata of geological significance. Hence, it is very important and meaningful to recover them from original seismic data. This paper adopts a novel algorithm named iterative natural thresholding algorithm (INTA) with the aim to improve the protection of weak reflections. Through an optimal thresholding operator and a concave regularization to enforce an optimal sparse solution, INTA can potentially recover these geological interfaces characterized by weak reflection. We utilize a synthetic seismic data profile and a real seismic data set to test its feasibility and show its better protection of small reflectivity series. From the inversion results, one can see that, compared to common used sparse constrained seismic inversion method, the inverted impedance by the proposed method can better characterize weak reflectors and help understand the structure of the earth more accurately.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100198"},"PeriodicalIF":1.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation mechanism of the deep double-layer thermal structure in Bohai Bay Basin, eastern China, and its impact on hydrocarbon production 渤海湾盆地深层双层热构造形成机制及其对油气生产的影响

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-05-02 DOI: 10.1016/j.jaesx.2025.100196

Yubei He, Jian Zhang

{"title":"Formation mechanism of the deep double-layer thermal structure in Bohai Bay Basin, eastern China, and its impact on hydrocarbon production","authors":"Yubei He, Jian Zhang","doi":"10.1016/j.jaesx.2025.100196","DOIUrl":"10.1016/j.jaesx.2025.100196","url":null,"abstract":"<div><div>Bozhong Depression is the marine part of Bohai Bay Basin and is also the area with the most abundant offshore oil and gas resources in China. According to recent seismic data, kinematic evolution has resulted in a double-layer velocity structure as well as a corresponding double-layer thermal structure in the crust and mantle in Bozhong Depression. Under the influence of the India–Eurasia collision and Pacific plate subduction, Bohai Bay Basin has been subjected to active rifting and associated heat transfers since the late Cenozoic, resulting in two sets of deep and shallow oil and gas reservoir systems, which are related to the double-layer thermal structure. However, the evolution mechanism of this structure remains unclear because of lack of research on the vertical structure of the lithosphere in the area. We conducted finite-element simulations using seismic, geomagnetic, and geothermal heat flow data; results indicate synchronous uplift of deep mantle material and high-temperature crustal material in Bozhong Depression around 23 Ma. Around 5.3 Ma, retreat of the Pacific plate subduction accelerated and the deep mantle was uplifted by a small amount, creating a double-layer structure with differential uplift between the mantle and the crust. Successive synchronous and differential uplift in a double-layer thermal structure explains the anomalously high temperatures found during exploratory drilling in Bozhong Depression. Furthermore, the temperature of the sedimentary stratum in Bozhong Depression currently lies within the best window for oil and gas generation; it is the Golden Age for numerous oil and gas reservoirs.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100196"},"PeriodicalIF":1.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geodynamic and magmatic evolution of the Kamyaran ophiolite complex, NW Iran: Tectonic transition from oceanic subduction to continental collision 伊朗西北部Kamyaran蛇绿岩杂岩的地球动力学和岩浆演化：从大洋俯冲到大陆碰撞的构造转变

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-04-28 DOI: 10.1016/j.jaesx.2025.100197

Ayoub Veisinia , Mohammad Ebrahimi , Bahman Rahimzadeh , Zhiyong Zhang , Jamshid Ahmadian , Rasoul Esmaeili

{"title":"Geodynamic and magmatic evolution of the Kamyaran ophiolite complex, NW Iran: Tectonic transition from oceanic subduction to continental collision","authors":"Ayoub Veisinia , Mohammad Ebrahimi , Bahman Rahimzadeh , Zhiyong Zhang , Jamshid Ahmadian , Rasoul Esmaeili","doi":"10.1016/j.jaesx.2025.100197","DOIUrl":"10.1016/j.jaesx.2025.100197","url":null,"abstract":"<div><div>The ophiolites in the Zagros orogen are relics of the Neo-Tethyan Ocean, which existed between the continents of Laurasia and Gondwana. There is much debate about the formation and evolution of the Neo-Tethyan Ocean. Knowledge on its pre-collisional tectonic evolution is of critical importance in precisely constraining its timing and history. The Kamyaran ophiolitic complex consists of several tectonically dismembered units including peridotite lenses and various gabbroic rocks as part of a Mesozoic ophiolitic belt extending from Kermanshah to Khoy in northwestern Iran. Mineral chemistry of the peridotites indicates that they underwent medium degree of partial melting (14–18%) and produced melts of MORB-like character in a suprasubduction setting with weak subduction-related signatures. The beginning of intra-oceanic subduction in the northeast margin of the Arabian plate caused metasomatism in the residual mantle of depleted peridotites. Gabbroic rocks display tholeiitic to calc-alkaline signatures with negative Nb, Th and Ti and positive Sr, Ba, U and Eu anomalies. Granular and pegmatoid gabbroic rocks with slight depletion of LREE and HREE pattern, crystallized from parental melts of N-MORB composition. This magma, characterized by negative Th, Nb, and Ti anomalies, was generated from depleted mantle. Pegmatoid gabbros are distinguished from granular gabbros by features such as more depleted REE, negative Th, Nb, Ti anomalies and lack of Eu positive anomalies. Microgabbroic dykes show N-MORB affinities and lack negative Nb and Ta anomalies. Geological and geochemical data suggest a transitional setting from oceanic island arc to continental arc following the closure of the Neo-Tethys. The complex is part of the supra-subduction zone ophiolite that emplaced during the collision of the Arabian and Iranian plateaus.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100197"},"PeriodicalIF":1.7,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fate of the Late Triassic Songpan-Ganzi Basin in the eastern Paleo-Tethys Ocean: Geochemical and geochronological constraints in the NE Tibetan Plateau 古特提斯洋东部晚三叠世松潘-甘孜盆地的命运：青藏高原东北缘的地球化学和年代学约束

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-03-30 DOI: 10.1016/j.jaesx.2025.100194

Hong-Xu Mu , Dan-Ping Yan , Liang Qiu , Ruo-Yan Kong , Ling-Xiao Gong

{"title":"Fate of the Late Triassic Songpan-Ganzi Basin in the eastern Paleo-Tethys Ocean: Geochemical and geochronological constraints in the NE Tibetan Plateau","authors":"Hong-Xu Mu , Dan-Ping Yan , Liang Qiu , Ruo-Yan Kong , Ling-Xiao Gong","doi":"10.1016/j.jaesx.2025.100194","DOIUrl":"10.1016/j.jaesx.2025.100194","url":null,"abstract":"<div><div>The Songpan-Ganzi Basin in the northeastern Tibetan Plateau preserves well-developed Late Triassic flysch sequences, making it an ideal region for investigating the provenance and tectonic evolution of the basin. This study aimed to constrain the provenance and tectonic setting of the basin by analyzing whole-rock geochemistry and detrital zircon U-Pb ages from Late Triassic flysch sediments. The flysch sequences show low SiO<sub>2</sub> (average 51.16 wt%), Al<sub>2</sub>O<sub>3</sub> (average 9.85 wt%) and Fe<sub>2</sub>O<sub>3</sub><sup>T</sup> + MgO (average 6.56 wt%) values, and K<sub>2</sub>O/Na<sub>2</sub>O (average 2.71) ratios, along with high SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratios (averaging 6.99), suggesting a continental arc setting. They also exhibit moderate chemical weathering (CIA: 60.32–83.72) and high component variability (0.9–2.34, average 1.61), revealing a moderately weathered source. Tectonic discrimination diagrams based on La-Sc-Th and Th-Sc-Zr/10 ratios suggest a continental arc setting. U-Pb ages of detrital zircons mainly range from 222 to 300 Ma and 450 to 520 Ma, reflecting the time of the emplacement of Paleozoic to Late Triassic plutons in the Qinling orogenic belt and Kunlun arc. Minor age peaks (720–850 Ma, 950–1300 Ma and 1400–2400 Ma) suggest subordinate contribution from the northern and western margins of the Yangtze Block. Cumulative proportion curves of zircon U-Pb ages for lower formations exhibit a steep accumulation trend, suggesting a convergent tectonic setting. In contrast, upper formations display a relatively flat accumulation curve, indicative of a collisional environment. This shift in curve characteristics suggests that the sedimentary environment evolved from convergent to collisional settings among the North China, South China, and Qiangtang blocks.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100194"},"PeriodicalIF":1.7,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Provenance of Middle Jurassic sandstones from the Yuqia depression in the northern Qiadam Basin (NW China): Implications for basin evolution and paleoclimatic conditions 塔里木盆地北部虞夏坳陷中侏罗统砂岩物源特征：盆地演化与古气候条件

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-03-29 DOI: 10.1016/j.jaesx.2025.100195

Kai Zhou , Minfang Yang , Ran Gao , Zhiming Yan , Peixin Zhang , Wanqing Wang , Weichao Wang , Lei Wang , Longyi Shao , Jing Lu

{"title":"Provenance of Middle Jurassic sandstones from the Yuqia depression in the northern Qiadam Basin (NW China): Implications for basin evolution and paleoclimatic conditions","authors":"Kai Zhou , Minfang Yang , Ran Gao , Zhiming Yan , Peixin Zhang , Wanqing Wang , Weichao Wang , Lei Wang , Longyi Shao , Jing Lu","doi":"10.1016/j.jaesx.2025.100195","DOIUrl":"10.1016/j.jaesx.2025.100195","url":null,"abstract":"<div><div>The petrography of 106 clastic rock samples from the Middle Jurassic Dameigou and Shimengou Formations in the Qaidam Basin was analyzed to investigate their provenance and basin evolution. Five distinct sandstone units have been identified from the base of the Dameigou Formation to the top of the Shimengou Formation, hereafter termed as S-I, S-II, S-III, S-IV, and S-V. Petrographic analysis suggests that during the deposition of S-I (Aalenian stage), sediments were sourced from the Qaidam Main Block at the southern margin of the basin and the South Qilian Mountains at the northern margin. However, during the deposition of S-II, S-III, S-IV, and S-V (Bajocian to early Callovian stages), the basin received sediments from the East Kunlun Mountains to the south and the Qilian Mountains to the north. Mineralogical Index of Alteration (MIA) values, along with discrimination diagrams, indicate that the Middle Jurassic climate in the Qaidam Basin transitioned from semi-humid and warm (S-I) to humid and warm (S-II to S-IV), before returning to semi-humid and warm conditions (S-V). A basin evolution model was developed according to our findings, which provide a better understanding in the basin-forming processes and the principle of resource accumulation in the Middle Jurassic.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100195"},"PeriodicalIF":1.7,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative evaluation and effectiveness criteria for the crystalline bedrock-type reservoir in the central uplift zone of the northern Songliao basin, NE China 松辽盆地北部中央隆起带结晶基岩型储层定量评价及有效性标准

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-03-29 DOI: 10.1016/j.jaesx.2025.100193

Bo Zhao , Shumin Yin , Zhongquan Li , Zheng Liu , Guoxin Sun , Chunming Lin , Zhen Li , Shun Zhang , Jing Li

{"title":"Quantitative evaluation and effectiveness criteria for the crystalline bedrock-type reservoir in the central uplift zone of the northern Songliao basin, NE China","authors":"Bo Zhao , Shumin Yin , Zhongquan Li , Zheng Liu , Guoxin Sun , Chunming Lin , Zhen Li , Shun Zhang , Jing Li","doi":"10.1016/j.jaesx.2025.100193","DOIUrl":"10.1016/j.jaesx.2025.100193","url":null,"abstract":"<div><div>The crystalline bedrock-type gas reservoirs in the central uplift zone of the northern Songliao Basin represent a significant target for deep natural gas exploration. However, few studies have evaluated and identified effective reservoirs within this specific zone. In this paper, we present a comprehensive study on several exploration drill cores to constrain the pore structure, fracture parameters, minimum porosity and permeability thresholds required for fluid migration in the crystalline bedrock-type reservoirs in the central uplift zone, in an attempt to establish the criteria for identifying effective reservoirs. The results reveal that nanometer- to micron-sized pores, microfissures, and fracture zones are well developed in the crystalline bedrock-type reservoirs, indicating that they can be classified as low-porosity, ultra-low-permeability reservoirs. The identified thresholds for an effective reservoir consist of porosity of 1.5 % and permeability of 0.015 × 10<sup>−3</sup> μm<sup>2</sup>, and a minimum pore-throat radius of 0.02 μm for fluid mobility. These criteria provide useful guides for identifying effective reservoirs within the crystalline bedrocks.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100193"},"PeriodicalIF":1.7,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Are hydropower dams and sand mining responsible for hydrological change in the Red river (Asia)? 水电站大坝和采砂是红河（亚洲）水文变化的原因吗？

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-03-22 DOI: 10.1016/j.jaesx.2025.100192

Anh Duc Trinh , Nho Lan Nguyen , Thu Nga Do , Andrew Watson , Michael Stockinger , Christine Stumpp

{"title":"Are hydropower dams and sand mining responsible for hydrological change in the Red river (Asia)?","authors":"Anh Duc Trinh , Nho Lan Nguyen , Thu Nga Do , Andrew Watson , Michael Stockinger , Christine Stumpp","doi":"10.1016/j.jaesx.2025.100192","DOIUrl":"10.1016/j.jaesx.2025.100192","url":null,"abstract":"<div><div>The Red River (RR) in Southeast Asia provides water for food and energy production, building materials in the form of sand mining and facilitates the movement of people and goods for millions of inhabitants in the Yunnan province in China and provinces in northern Vietnam. Since the late 20th century, rapid economic development in the region has led to significant human-induced changes to the RR. In this study, we applied multiple statistical tests (Mann-Kendall, Pettitt, Mann-Whitney and principal component analysis) to analyse daily water flow data from seven hydro-meteorological stations in the lower section of the RR, aiming to identify the primary factors altering the water flow regime. Our findings indicate that the Hoa Binh reservoir, commissioned in 1989, and the Son La reservoir, commissioned in 2010, have significantly modified the flow regime, reducing the annual mean water flow of the RR main tributary from 1763 m<sup>3</sup> s<sup>−1</sup> between 1986 and 2008 to 1334 m<sup>3</sup> s<sup>−1</sup> between 2009 and 2023. This study is the first to identify that widespread and loosely regulated sand mining in the lower RR region has not only lowered the riverbed and water levels, as reported in recent studies, but also increased groundwater discharge into the river. As a result, despite the reduced upstream water flow from the mountains, the river discharge in the downstream region has remained statistically unchanged over the past decade in the RR.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100192"},"PeriodicalIF":1.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial distribution of structural lineaments in the Al-Lith geothermal field, western Saudi Arabia: Remote sensing and aeromagnetic data analysis 沙特阿拉伯西部Al-Lith地热田构造线的空间分布：遥感和航磁数据分析

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-03-08 DOI: 10.1016/j.jaesx.2025.100191

Jawad Rafiq, Israa S. Abu-Mahfouz, Konstantinos Chavanidis, Daffa Arrofi, Pantelis Soupios

{"title":"Spatial distribution of structural lineaments in the Al-Lith geothermal field, western Saudi Arabia: Remote sensing and aeromagnetic data analysis","authors":"Jawad Rafiq, Israa S. Abu-Mahfouz, Konstantinos Chavanidis, Daffa Arrofi, Pantelis Soupios","doi":"10.1016/j.jaesx.2025.100191","DOIUrl":"10.1016/j.jaesx.2025.100191","url":null,"abstract":"<div><div>Saudi Arabia is enriched in numerous geothermal resources. Among these, Wadi Al-Lith is regarded as one of the favorable geothermal prospects in western Saudi Arabia, featuring several hot springs with a discharge temperature of around 95 °C. However, there is still uncertainty regarding the delineation of the prospective geothermal reservoir, and the assessment of the geothermal energy reserves. Therefore, this paper aims to delineate the prospective geothermal area, utilizing remote sensing and geophysical (magnetic) data. This research maps the surface and subsurface geological and structural features (faults, fractures, and fold axes) and analyzes their densities using an integrated geological-remote sensing-geophysical investigation. Digital elevation models and Landsat-8 imagery, supported by field investigations, were used to analyze surface lineament density, while airborne magnetic data was used to analyze subsurface lineament density. The study area was subdivided into ten zones based on surface lineament density, with the northernmost zone presenting the highest lineament density. Subsurface lineament density analysis revealed five high-density zones, three of which correspond well with those identified on the surface. The study also identified the main high-permeability zones and associated geothermal anomalies in the Wadi Al-Lith area, improving the understanding of its potential geothermal resources. The results of this study could serve as a preliminary guide for further geothermal exploration, highlighting surface manifestations that require in-depth investigation using geoscientific and drilling tools.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100191"},"PeriodicalIF":1.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differential diagenetic and densification processes of low-permeability and tight sandstones: A case study of the Jurassic Shaximiao Formation in the central and western Sichuan Basin, China 低渗透致密砂岩差异成岩致密化过程——以四川盆地中西部侏罗系沙溪庙组为例

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-01-09 DOI: 10.1016/j.jaesx.2025.100190

Laixing Cai , Chengfang Yuan , Shaomin Zhang , Xiaojuan Wang , Yinglin Liu , Weixue Guo , Tian Yang

{"title":"Differential diagenetic and densification processes of low-permeability and tight sandstones: A case study of the Jurassic Shaximiao Formation in the central and western Sichuan Basin, China","authors":"Laixing Cai , Chengfang Yuan , Shaomin Zhang , Xiaojuan Wang , Yinglin Liu , Weixue Guo , Tian Yang","doi":"10.1016/j.jaesx.2025.100190","DOIUrl":"10.1016/j.jaesx.2025.100190","url":null,"abstract":"<div><div>Tight sandstone reservoirs of low permeability are of both scientific and economic significance, but their origin and formation process remain not well understood.. In this paper, we present a comprehensive study of the tight sandstone reservoir of the Middle Jurassic Shaximiao Formation distributed in central and western Sichuan Basin, by integrating scanning electron microscopy, X-ray diffraction, high-pressure mercury injection, and nuclear magnetic resonance. The aim of this study was to investigate the differential diagenetic sequences constrained by quantifying the provenance of the sandstones and densification processes. Overall, the Shaximiao Formation sandstones have low porosity of 0.46 %–18.76 % (averaging 10.17 %) and low permeability ranging from 0.0003 to 632.42 × 10<sup>−3</sup> μm<sup>2</sup> (averaging 3.67 × 10<sup>−3</sup> μm<sup>2</sup>), with 73.72 % being classified as tight reservoirs. The sandstone samples from the western Sichuan Basin commonly display tubular or needle-shaped throats with less developed microfractures, consequently having weaker seepage capacity compared to the varieties in the central Sichuan Basin that are characterized by abundant lamellar and necked throats. The results suggest that the slightly lower contents of rigid particles and higher contents of fragments and argillaceous matrix facilitated continuous compaction and multitype cementation processes. Meanwhile, strong compaction of the rocks with cements of carbonate, siliceous materials, and laumontite being the cement lead to porosity reduction of 29.8 %, 12.27 %, 13.34 %, and 12.33 %, respectively. In contrast, chlorite coating and dissolution events have crucial roles in preserving pores and enhancing permeability.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100190"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Origin and evolution of serpentinized peridotite from the Ciletuh Mélange in Sunda Arc, Indonesia: Evidence from petrography, mineralogy, and geochemistry 印度尼西亚巽他弧Ciletuh m<s:1>兰格蛇纹石橄榄岩的起源和演化：岩石学、矿物学和地球化学证据

IF 1.7

Journal of Asian Earth Sciences: X Pub Date : 2025-01-03 DOI: 10.1016/j.jaesx.2024.100188

Rinaldi Ikhram , Takashi Hoshide , Tsukasa Ohba , Mega Fatimah Rosana , Adi Hardiyono

{"title":"Origin and evolution of serpentinized peridotite from the Ciletuh Mélange in Sunda Arc, Indonesia: Evidence from petrography, mineralogy, and geochemistry","authors":"Rinaldi Ikhram , Takashi Hoshide , Tsukasa Ohba , Mega Fatimah Rosana , Adi Hardiyono","doi":"10.1016/j.jaesx.2024.100188","DOIUrl":"10.1016/j.jaesx.2024.100188","url":null,"abstract":"<div><div>The Ciletuh Mélange in southern Sundaland (West Java, Indonesia) is a key location for ophiolitic mélanges, featuring widespread serpentinized peridotite. These rocks exhibit varied textures and structures and can be classified into three types based on the extent of serpentinization: type 1 (lherzolite, <10 % serpentinization), type 2 (60–80 % serpentinization), and type 3 (>90 % serpentinization). Olivine and spinel mineral chemistry indicates two origins for the peridotite: magmatic cumulate (type 1, olivine Fo#: ∼81, spinel Cr#: 63–70) and mantle-derived (types 2 and 3, olivine Fo: 88–90, spinel Cr#: 55–66). Protoliths of both types 2 and 3 show abyssal (mid-oceanic ridge basalt) and fore-arc mantle peridotite characteristics, formed by partial melting (∼5–25 %) and melt-rock interaction (TiO<sub>2</sub> in spinel > 1 wt%). Type 1 lherzolite, by contrast, crystallized as a cumulate at the mantle-crust boundary. The variation of geochemical signatures, along with evidence of melt influence, suggest formation in a supra-subduction zone. In subduction systems, the protoliths underwent serpentinization at varying metamorphic grades, producing serpentines such as lizardite, antigorite, chrysotile, and polygonal serpentine. Antigorite formed under high-grade metamorphism, while lizardite, chrysotile, and polygonal serpentine form under lower-grade conditions. The presence of rodingite dikes cutting through serpentinite suggests metasomatic processes, notably rodingitization, involving diffusional metasomatism between serpentinization fluids and metamorphosed gabbro in the subduction zone. Serpentinized peridotites and rodingites were later exhumed as part of the ophiolitic mélange.</div></div>","PeriodicalId":37149,"journal":{"name":"Journal of Asian Earth Sciences: X","volume":"13 ","pages":"Article 100188"},"PeriodicalIF":1.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0