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Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance 中国四川盆地东北部瓜达卢佩-隆平带碳酸盐岩的地球化学:对古海洋环境和产地的影响
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-07 DOI: 10.1007/s13146-024-00934-9
Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan
{"title":"Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance","authors":"Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan","doi":"10.1007/s13146-024-00934-9","DOIUrl":"https://doi.org/10.1007/s13146-024-00934-9","url":null,"abstract":"<p>As the last part of the Hercynian cycle in the Yangtze region, the Dongwu Movement included the eruption of the Emeishan large igneous province (ELIP) and was an essential event between the Guadalupian and Lopingian, which had significant implications for the paleo-oceanic environment and paleoclimate of the area. To study the changes in the sedimentary environment in the Guadalupian and Lopingian, the Zhenba section was selected, and its trace elements and rare earth elements (REEs) were analyzed. From analysis of the trace elements and REEs in the Guadalupian, the limestone samples had prominent typical shallow-water seawater deposition characteristics and were less affected by terrigenous detritus, which was in an arid oxidation environment; Sr/Cu ranged from 4 to 1381, the Rb/Sr value was low, δCe &lt; 1, Ce<sub>anom</sub> &lt; −0.1, Er/Nd ranged from 0.1 to 0.27, and Y/Ho ranged from 44 to 72. However, in the Lopingian, the limestone samples were more affected by terrigenous detritus, which was in a humid climate with a weak oxidation‒reduction environment; the Sr/Cu ranged from 1 to 656, the Rb/Sr value was high, δCe ≅ 1, Ce<sub>anom</sub> ≥ −0.1, Er/Nd &lt; 0.1, and Y/Ho ranged from 26 to 44. The geochemical diagrams of TiO<sub>2</sub>‒Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>‒REE, La‒Th‒Sc, Th‒Co‒Zr/10, Th‒Sc‒Zr/10 and <sup>87</sup>Sr/<sup>86</sup>Sr of a sample indicated that the terrigenous detritus of the sample mainly came from the South Qinling active continental margin, rather than the weathering of Emeishan basalt. Acid bentonite came from the Paleo-Tethys island arc or the island arc formed by the subduction of the South China Plate beneath the North China Plate, rather than the ELIP. This evidence supported the view that the North China Plate potentially collided with the South China Plate in middle to late Wujiaping.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"38 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074596","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
Identifying sub-surface Triassic salt diapirs under domal structures in the Tunisian Atlas: exploration targets for potential mineralization 确定突尼斯阿特拉斯地区穹隆构造下的三叠纪地下盐沼泽:潜在矿化的勘探目标
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-06 DOI: 10.1007/s13146-024-00935-8
{"title":"Identifying sub-surface Triassic salt diapirs under domal structures in the Tunisian Atlas: exploration targets for potential mineralization","authors":"","doi":"10.1007/s13146-024-00935-8","DOIUrl":"https://doi.org/10.1007/s13146-024-00935-8","url":null,"abstract":"<h3>Abstract</h3> <p>The aim of this study is to propose a conceptual model explaining the geometry, origin, distribution of three selected domal structures, namely Jerissa, Bou El Haneche and Bir Es Solâa and associated mineralization. These structures, located on the border of the NW–SE Kalaa Khasba graben (Tunisian Atlas), had not been extensively investigated and only inferred—but not positively identified—as salt diapirs. For this goal, a multi-disciplinary method based on satellite images, digital elevation models (DEMs), morpho-structural analysis, hydrochemistry and seismic data was used. The domal structures are clearly expressed in the DEMs, drained by radial hydrographic networks and affected by radial faulting. Under the Jerissa dome, the aquifer water samples contain high strontium values (546–598 mg/l) and also have high Sr<sup>2+</sup>/ Ca<sup>2+</sup> ratios (between 10.59‰ and 11.22‰). This aquifer water chemical characteristics coupled to the interpretation of a seismic line crossing this structure suggest the presence of Triassic evaporitic materials in the sub-surface. The Triassic evaporitic sediments beneath the Bir Es Solâa structure were detected in the BS-1 drill hole. The results provide arguments for the existence of sub-outcropping Triassic rock which may be interpret as sub-surface diapirs under these domal structures, located preferentially at the intersection of regional NW–SE, E–W and NE–SW striking fault networks. At the three selected structures, the Aptian limestone forms the main mineralization traps for Pb–Zn–Ba and Fe. These sub-surface diapirs can be targets for mineral exploration in effort to discover potential mineralized bodies with economic concentration in central–northern Tunisian Atlas.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"66 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140045195","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
Lithostratigraphy, petrography, and geochemistry of the Eocene–Oligocene rock succession, Wadi Arhab area, North Eastern Desert, Egypt 埃及东北部沙漠 Wadi Arhab 地区始新世-更新世岩石演替的岩层学、岩相学和地球化学
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-05 DOI: 10.1007/s13146-024-00928-7
{"title":"Lithostratigraphy, petrography, and geochemistry of the Eocene–Oligocene rock succession, Wadi Arhab area, North Eastern Desert, Egypt","authors":"","doi":"10.1007/s13146-024-00928-7","DOIUrl":"https://doi.org/10.1007/s13146-024-00928-7","url":null,"abstract":"<h3>Abstract</h3> <p>The present study recorded for the first time, an occurrence of Oligocene basaltic plugs in Beni-Suef Governorate, Egypt. In addition, Egyptian alabaster was discovered in the study area, further the well-known ancient area around the Cavern of Wadi Sannur. In this work, the lithostratigraphy, structure, petrography, and geochemistry including TGA and DSC were studied. In addition, the thermal effect of the basaltic magma on the Eocene carbonates that covered most of the area, caused the formation of the Egyptian alabaster in the region. The Eocene succession represents different stages in age (late Middle–Late Eocene). Their outcrops are disconformably overlain by the basaltic plugs extruded along the NW–SE fault trend which is parallel to the Red Sea graben which was formed in the Oligo–Miocene Period. Petrographically, the Eocene rocks show ten microfacies types indicating that deposition of Eocene carbonates in the subtidal shallow marine environment except for microfacies of the Egyptian alabaster shows that the precipitation is related to the basaltic thermal effect and related hydrothermal waters within open cavities or karstic systems in the Eocene carbonate. The chemical analysis showed that SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, MgO, Fe<sub>2</sub>O<sub>3</sub>, and CaO are of high content as major oxides, while Sr and Ba are of high content in the basaltic plugs as trace elements. TG analysis shows that basaltic rocks in the present study are suitable for conserving high-temperature thermal energy because they do not exhibit any thermal events when exposed to thermal influences by DSC between 30 °C and 1000 °C. Unlike both Egyptian alabaster and recrystallized limestone which are not suitable for maintaining high temperatures between 695 °C and 965 °C and decompose into CaO and CO<sub>2</sub> due to the decarbonization of the calcite mineral.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"12 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140036880","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
Discovery and primary study of the lithium content in the karst-type bauxite deposit, Jajarm, Iran 伊朗贾贾尔姆岩溶型铝土矿锂含量的发现和初步研究
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-04 DOI: 10.1007/s13146-024-00941-w
Masoumeh Nikdel, Majid Ghoraee Tafti, Morteza Nikdel
{"title":"Discovery and primary study of the lithium content in the karst-type bauxite deposit, Jajarm, Iran","authors":"Masoumeh Nikdel, Majid Ghoraee Tafti, Morteza Nikdel","doi":"10.1007/s13146-024-00941-w","DOIUrl":"https://doi.org/10.1007/s13146-024-00941-w","url":null,"abstract":"<p>Lithium (Li) is a critical metal for global development and modern energy. Emerging sediment hosts, which contain karst-type bauxite deposits, afford a potential source of Li resources. Iran has no history in occurrence of bauxite-hosted Li deposits and no investigations have done. Therefore, that leads to the importance of further research and exploration on these deposits. In this investigation, the samples of Jajarm bauxite were analyzed by combination of X-ray diffraction (XRD), petrographic and scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray fluorescence (XRF) techniques, with the aims to investigate the distribution and enrichment of the Li. The results show that Li concentrations in Jajarm bauxite deposit range from 91 to 1192 ppm. The maximum Li concentrations occur in shaly bauxite samples. Oolitic bauxite mainly consists of diaspore and chamosite, with small amounts of anatase and boehmite. Shaly bauxite dominantly consists of kaolinite, diaspore with small amounts of mica, quartz, and anatase, and kaolinitic bauxite predominantly consists of kaolinite. Kaolinite, diaspore, anatase, and mica minerals were identified by SEM–EDS analysis. Independent Li minerals were not found in mineralogical analysis. The correlation coefficient of Li with other mineralogical and geochemical parameters shows that kaolinite and mica are the most likely host minerals of Li in the studied bauxites. Therefore, Jajarm bauxite deposit, located in northeastern Iran, serves as a bauxite resource and an independent Li resource, making it valuable for development and utilization.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"6 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026014","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
A detailed investigation of Jutana Formation for depositional setting in Indus Basin, Pakistan 巴基斯坦印度河盆地朱塔纳地层沉积环境详细调查
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-04 DOI: 10.1007/s13146-024-00951-8
Muhammad Ibrar, Hameed Ur Rehman, Suleman Khan, Syed Saddam Hussain, Maqsood Ur Rahman, Abdullah Khan
{"title":"A detailed investigation of Jutana Formation for depositional setting in Indus Basin, Pakistan","authors":"Muhammad Ibrar, Hameed Ur Rehman, Suleman Khan, Syed Saddam Hussain, Maqsood Ur Rahman, Abdullah Khan","doi":"10.1007/s13146-024-00951-8","DOIUrl":"https://doi.org/10.1007/s13146-024-00951-8","url":null,"abstract":"<p>The origin and depositional setting of dolomites remain a complex and debated topic. In the Indus Basin Pakistan, the dolomites in Jutana Formation form a thick sequence within the Cambrian stratigraphy. The current study investigates the detailed depositional setting as well as the mineralogical composition of dolomites in the Jutana Formation to provide insight into their origin. The study focuses on integrating the microfacies and Scanning Electron Microscopy (SEM) with X-ray diffraction (XRD) data along with Wireline logs of Jutana Formation in Khewra Gorge, Eastern Salt Range. Based on field and petrographic observations, four microfacies were identified including (a) siliciclastic algal laminated dolomitic breccia (MJD-1), (b) burrowed sandy ferroan dolomicrite (MJD-2), (c) in-situ medium-coarse grained dolomicrite-dolosparite (MJD-3), (d) fine grained micaceous dolosparite (MJD-4). The microfacies analysis reveals that the deposition of the Jutana Formation is primary on carbonate platform in peritidal environments, ranging from supratidal to subtidal. Digenesis has obliterated most of the primary depositional features, making the interpretation of the original depositional setting challenging. The XRD analysis suggests that these dolomites are nearly stoichiometric and less ordered, indicating an early diagenetic setting, further supported by the presence of anhydrite seen under the SEM. The original depositional setting on the carbonate platform is also supported by cross plot graph wireline logs.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"7 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026425","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
Pollen and grain size characteristics recorded from evaporite in the Kumishi Basin in arid Central Asia: implications for climate and environmental change since the late glacial 中亚干旱地区库米希盆地蒸发岩记录的花粉和粒度特征:对晚冰期以来气候和环境变化的影响
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-02 DOI: 10.1007/s13146-024-00952-7
Tiantao Yin, Mingzhang Peng, Yujing Yin, Chao Zhang, Fengan Yin, Congcong Zhao
{"title":"Pollen and grain size characteristics recorded from evaporite in the Kumishi Basin in arid Central Asia: implications for climate and environmental change since the late glacial","authors":"Tiantao Yin, Mingzhang Peng, Yujing Yin, Chao Zhang, Fengan Yin, Congcong Zhao","doi":"10.1007/s13146-024-00952-7","DOIUrl":"https://doi.org/10.1007/s13146-024-00952-7","url":null,"abstract":"<p>Climatic and environmental changes in the arid region of Central Asia since the late glacial period have long been a research focus. This study investigated the 200 cm evaporite profile in the Kumishi Basin, an inland Salt Lake situated in the arid region of Central Asia. By utilising AMS<sup>14</sup>C dating and examining the relationship between pollen and grain size, this study analysed the paleoclimate and related paleoenvironmental changes. Based on the dating results and the characteristics of pollen and grain size, it was deduced that the Kumishi Salt Lake formed prior to 11.6 cal ka BP. Although the climate was initially humid, the dominant conditions in this area were mainly arid, featuring desert and desert vegetation environments. Between 11.6 and 6.0 cal ka BP, the vegetation primarily consisted of desert steppe, while the climate remained predominantly dry with a minor period of humidity in the early stages of the Holocene. From 6.0 to 0 cal ka BP, desert grasslands continued to dominate the landscape as the climate gradually intensified in aridity. These climate fluctuations in the Kumishi Salt Lake area exhibited distinct regional characteristics after the late glacial period. Compared to the monsoon system, the climate of the study area was more likely influenced and controlled by the westerlies, as particularly evidenced by the dry environment during the Holocene period.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"70 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019808","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 geohazards of karstified limestone in Al-Coeffiah area, Benghazi plain, NE Libya 利比亚东北部班加西平原 Al-Coeffiah 地区岩溶石灰岩地质灾害评估
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-02 DOI: 10.1007/s13146-024-00933-w
Entisar El-Rayani, Fathi Salloum, Abdelsalam Elshaafi, Awad Bilal, Khalifa Eldursi
{"title":"Assessment of geohazards of karstified limestone in Al-Coeffiah area, Benghazi plain, NE Libya","authors":"Entisar El-Rayani, Fathi Salloum, Abdelsalam Elshaafi, Awad Bilal, Khalifa Eldursi","doi":"10.1007/s13146-024-00933-w","DOIUrl":"https://doi.org/10.1007/s13146-024-00933-w","url":null,"abstract":"<p>Al-Coeffiah karst terrain is located in Benghazi plain which is a part of Al-Jabal Al-Akhdar anticlinorium, northeast Libya. The exposed stratigraphic sequence of the area is largely represented by the Middle Miocene limestone rocks of Benghazi Formation. The area is affected by abundant karstic features such as caves and giant dolines with many subsurface voids and canal networks which extends for several kilometers. This research is based on field observations combined with analysis of high-resolution satellite imagery of Al-Coeffiah karst terrain. The main aim is to assess potential geohazards provided by the karst features, including (i) rock failure, (ii) groundwater pollution, and (iii) geochemical processes. The potential geohazards have been found to lies in the large caves at shallow depths such as Al-Jebah, Habibi, Merisi, and Boukarmah doline-caves. In addition, there is a greater geohazard in fractured karst terrains which are created by dolines in soft sediments. Chemical and bacteriological analyses indicate that the groundwater pollution in Al-Coeffiah area and its surrounding regions is considered as one of the most serious problems largely due to the seepage of sewage water through karst phenomena particularly during the last 10 years.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"59 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019627","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
Diagenetic impact on unconventional tight carbonate reservoir of AR-F Member from the Abu Gharadig Field, north Western Desert, Egypt: insights from integrated combined sedimentological, petrographic, and petrophysical dataset 对埃及西部沙漠北部 Abu Gharadig 油田 AR-F 成员非常规致密碳酸盐岩储层的成因影响:沉积学、岩相学和岩石物理学综合数据集的启示
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-01 DOI: 10.1007/s13146-024-00932-x
{"title":"Diagenetic impact on unconventional tight carbonate reservoir of AR-F Member from the Abu Gharadig Field, north Western Desert, Egypt: insights from integrated combined sedimentological, petrographic, and petrophysical dataset","authors":"","doi":"10.1007/s13146-024-00932-x","DOIUrl":"https://doi.org/10.1007/s13146-024-00932-x","url":null,"abstract":"<h3>Abstract</h3> <p>Upper Cretaceous organic-rich carbonate rocks of the Abu Roash F (AR-F) Member represent both source rock and reservoir units and are considered as an unconventional reservoir rock at the Abu Gharadig Field (AGF), Western Desert, Egypt. This study aims to investigate the diagenetic history and its impact on the porosity and permeability of the AR-F unconventional reservoir rock using the sedimentological, petrographic, and petrophysical results for 24 core samples of the AR-F carbonate Member from well AG-121X, located in AGF, Western Desert, Egypt. The petrographic results show that the AR-F Member is composed mainly of mudstone, wackestone/packstone, and packstone microfacies. These microfacies and the richness of such marine assemblages, including planktic forams, calcispheres, pelagic bivalves, echinoderms, with rare pelecypods and ostracods suggest that the AR-F carbonate facies were deposited in mainly deep sea to deep shelf and slope marine settings. The studied AR-F carbonate facies have relatively low total porosity in the range of 0.95–2.33%, which includes mainly grain-based (intergranular and intragranular) and non-grain-based (fenestral, fracture, and dissolution) pores. The core laboratory measurements also show that the AR-F carbonate facies is impermeable rock, with values of up to 0.0039 mD. Therefore, the existence of different types of porosities and permeabilities pointed out that the reservoir quality of the AR-F carbonate facies at the AGF ranges from poor to very poor quality. This could be attributed to different stages of diagenesis, including eogenesis and mesogenesis. These deformation stages, on one hand, contributed to reducing and destroying the reservoir porosity and permeability by a series of processes like micritization, cementation, mechanical and chemical compaction, and less pronouncing pyritization and kaolinitic precipitation. On the other hand, dissolution and fracturing enhanced, in a limited way, the porosity. According to the findings of this study, the AR-F carbonate succession is suitable for further exploitation as an unconventional tight resource of oil reservoir potential.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"145 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019722","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
Evaluation of natural fractures and geological sweet spot in the Shunbei ultra-deep carbonate fault-controlled reservoir, Tarim Basin 塔里木盆地顺北超深层碳酸盐岩断层控制储层天然裂缝和地质甜点评价
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-03-01 DOI: 10.1007/s13146-024-00926-9
{"title":"Evaluation of natural fractures and geological sweet spot in the Shunbei ultra-deep carbonate fault-controlled reservoir, Tarim Basin","authors":"","doi":"10.1007/s13146-024-00926-9","DOIUrl":"https://doi.org/10.1007/s13146-024-00926-9","url":null,"abstract":"<h3>Abstract</h3> <p>The Shunbei ultra-deep carbonate strike-slip fault-controlled reservoir in Tarim Basin is rich in reserves. The strike-slip faults and the natural structural fractures are the main storage space and flow channels of hydrocarbon resources. Therefore, studying the natural fracture development characteristics in this kind of reservoir is of great significance. The lithology of the Middle and Lower Ordovician strata in the Shunbei area is limestone and dolomite, including packstone, wackestone, grainstone, boundstone, lime mudstone, silicified limestone and silty-fine crystalline dolomite, medium-coarse crystalline dolomite. Based on the statistics of fracture density and brittleness index of core samples, it is found that in limestone, lime mudstone has the highest brittleness index, while boundstone has the lowest; in dolomite, the brittleness index of medium-coarse crystalline dolomite is higher than that of silty-fine crystalline dolomite. The natural structural fracture density has an obvious positive correlation with the rock brittleness index. The brittleness index of dolomite is generally higher than that of limestone. When the brittleness index is the same, dolomite has superior porosity and permeability, whereas limestone has a stronger capacity to fracture. Those kinds of highly brittle layers in carbonate reservoirs are more likely to be geological sweet spots in the Shunbei area.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"47 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019815","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
Hydrologic response in a typical karst desertification catchment 典型岩溶石漠化集水区的水文响应
IF 1.4 4区 地球科学
Carbonates and Evaporites Pub Date : 2024-02-28 DOI: 10.1007/s13146-024-00929-6
Yuan Li, Qiuwen Zhou, Yuluan Zhao
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