China Geology最新文献

{"title":"Geological conditions and reservoir characteristics of various shales in major shale-hosted regions of China","authors":"Shu-jing Bao ,&nbsp;Tian-xu Guo ,&nbsp;Jin-tao Yin ,&nbsp;Wei-bin Liu ,&nbsp;Sheng-jian Wang ,&nbsp;Hao-han Li ,&nbsp;Zhi Zhou ,&nbsp;Shi-zhen Li ,&nbsp;Xiang-lin Chen","doi":"10.31035/cg2022082","DOIUrl":"https://doi.org/10.31035/cg2022082","url":null,"abstract":"<div><p>China is home to shales of three facies: Marine shale, continental shale, and marine-continental transitional shale. Different types of shale gas are associated with significantly different formation conditions and major controlling factors. This study compared the geological characteristics of various shales and analyzed the influences of different parameters on the formation and accumulation of shale gas. In general, shales in China’s several regions exhibit high total organic carbon (TOC) contents, which lays a sound material basis for shale gas generation. Marine strata generally show high degrees of thermal evolution. In contrast, continental shales manifest low degrees of thermal evolution, necessitating focusing on areas with relatively high degrees of thermal evolution in the process of shale gas surveys for these shales. The shales of the Wufeng and Silurian formations constitute the most favorable shale gas reservoirs since they exhibit the highest porosity among the three types of shales. These shales are followed by those in the Niutitang and Longtan formations. In contrast, the shales of the Doushantuo, Yanchang, and Qingshankou formations manifest low porosities. Furthermore, the shales of the Wufeng and Longmaxi formations exhibit high brittle mineral contents. Despite a low siliceous mineral content, the shales of the Doushantuo Formation feature a high carbonate mineral content, which can increase the shales’ brittleness to some extent. For marine-continental transitional shales, where thin interbeds of tight sandstone with unequal thicknesses are generally found, it is recommended that fracturing combined with drainage of multiple sets of lithologic strata should be employed to enhance their shale gas production.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000624/pdfft?md5=4c575be4d5ba8eebae3dc028c375ebdb&pid=1-s2.0-S2096519224000624-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age and geochemical evolution of granite magmatism in Olkhon region from Caledonian syncollisional ore-free granite to the rare metal granite and pegmatite of Middle Paleozoic intraplate setting","authors":"Viktor Antipin ,&nbsp;Valentina Makrygina ,&nbsp;Larisa Kushch ,&nbsp;Nataliya Sheptyakova","doi":"10.31035/cg2023040","DOIUrl":"10.31035/cg2023040","url":null,"abstract":"<div><p>The detailed description of two granite complexes in the Olkhon subterrane is given. The Early Paleozoic Sharanur complex was formed by granitization of gneisses of the Olkhon series. It includes migmatites, granite-gneisses, granites and pegmatites of normal alkalinity; they belong to the type of syncollisional granites. The Middle Paleozoic Aya granite complex includes mother Aya massif of amazonite-bearing granites and several types of rare-metal pegmatites. They have elevated alkalinity, low of Ba, Sr, and high LILE and HFSE elements contents. The Aya pegmatites lie in northwest cracks of stretching and associated with the rise of the territory under the influence of the North Asian plume. These cracks and pegmatites mark the beginning of a new intraplate geodynamic setting. Two geochemical types are distinguished among the pegmatites of this complex. These are amazonite pegmatites of Li-F type with Ta mineralization and complex type pegmatite with Be-Rb-Nb-Ta and Li-F mineralization (the Ilixin vein). The Tashkiney pegmatite vein is similar to Ilixin, but lies in the gneisses of the Olkhon series. It shows high concentrations of Be, Nb, Ta, as well as W, Sn, but lacks Li and F, due to a greater depth and higher temperature of the melt crystallization of this pegmatite.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000569/pdfft?md5=646c9292802440c3f2c847a44a0b0ce4&pid=1-s2.0-S2096519224000569-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86087020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential evaluation of saline aquifers for the geological storage of carbon dioxide: A case study of saline aquifers in the Qian-5 member in northeastern Ordos Basin","authors":"Yan Li ,&nbsp;Peng Li ,&nbsp;Hong-jun Qu ,&nbsp;Gui-wen Wang ,&nbsp;Xiao-han Sun ,&nbsp;Chang Ma ,&nbsp;Tian-xing Yao","doi":"10.31035/cg2023045","DOIUrl":"10.31035/cg2023045","url":null,"abstract":"<div><p>The well-developed coal electricity generation and coal chemical industries have led to huge carbon dioxide (CO₂) emissions in the northeastern Ordos Basin. The geological storage of CO₂ in saline aquifers is an effective backup way to achieve carbon neutrality. In this case, the potential of saline aquifers for CO₂ storage serves as a critical basis for subsequent geological storage project. This study calculated the technical control capacities of CO₂ of the saline aquifers in the fifth member of the Shiqianfeng Formation (the Qian-5 member) based on the statistical analysis of the logging and the drilling and core data from more than 200 wells in the northeastern Ordos Basin, as well as the sedimentary facies, formation lithology, and saline aquifer development patterns of the Qian-5 member. The results show that (1) the reservoirs of saline aquifers in the Qian-5 member, which comprise distributary channel sand bodies of deltaic plains, feature low porosities and permeabilities; (2) The study area hosts three NNE-directed saline aquifer zones, where saline aquifers generally have a single-layer thickness of 3–8 m and a cumulative thickness of 8–24 m; (3) The saline aquifers of the Qian-5 member have a total technical control capacity of CO₂ of 119.25 × 10⁶ t. With the largest scale and the highest technical control capacity (accounting for 61% of the total technical control capacity), the Jinjie-Yulin saline aquifer zone is an important prospect area for the geological storage of CO₂ in the saline aquifers of the Qian-5 member in the study area.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000521/pdfft?md5=383117874fe046aa0596dec4ba06b466&pid=1-s2.0-S2096519224000521-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79869007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mangrove wetlands distribution status identification, changing trend analyzation and carbon storage assessment of China","authors":"Chang Li ,&nbsp;Fu Wang ,&nbsp;Peng Yang ,&nbsp;Fei-cui Wang ,&nbsp;Yun-zhuang Hu ,&nbsp;Yan-lin Zhao ,&nbsp;Li-zhu Tian ,&nbsp;Rui-bin Zhao","doi":"10.31035/cg2023049","DOIUrl":"10.31035/cg2023049","url":null,"abstract":"<div><p>This research investigates the ecological importance, changes, and status of mangrove wetlands along China’s coastline. Visual interpretation, geological surveys, and ISO clustering unsupervised classification methods are employed to interpret mangrove distribution from remote sensing images from 2021, utilizing ArcGIS software platform. Furthermore, the carbon storage capacity of mangrove wetlands is quantified using the carbon storage module of InVEST model. Results show that the mangrove wetlands in China covered an area of 278.85 km² in 2021, predominantly distributed in Hainan, Guangxi, Guangdong, Fujian, Zhejiang, Taiwan, Hong Kong, and Macao. The total carbon storage is assessed at 2.11×10⁶ t, with specific regional data provided. Trends since the 1950s reveal periods of increase, decrease, sharp decrease, and slight-steady increases in mangrove areas in China. An important finding is the predominant replacement of natural coastlines adjacent to mangrove wetlands by artificial ones, highlighting the need for creating suitable spaces for mangrove restoration. This study is poised to guide future mangrove-related investigations and conservation strategies.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209651922400051X/pdfft?md5=abd372254bbcb39a72aa3cfa15ac1f61&pid=1-s2.0-S209651922400051X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90127441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plume-lithosphere interaction in the Comei Large Igneous Province: Evidence from two types of mafic dykes in Gyangze, south Tibet, China","authors":"Ya-ying Wang ,&nbsp;Ling-sen Zeng ,&nbsp;Li-e Gao ,&nbsp;Li-long Yan ,&nbsp;Ling-hao Zhao ,&nbsp;Jia-hao Gao ,&nbsp;Ying-long Di ,&nbsp;Guang-xu Li ,&nbsp;Yi-hong Tian","doi":"10.31035/cg2023023","DOIUrl":"10.31035/cg2023023","url":null,"abstract":"<div><p>Two suites of mafic dykes, T1193-A and T1194-A, outcrop in Gyangze area, southeast Tibet. They are in the area of Comei LIP and have indistinguishable field occurrences with two other dykes in Gyangze, T0902 dyke with 137.7±1.3 Ma zircon age and T0907 dyke with 142±1.4 Ma zircon age reported by <span>Wang YY et al. (2016)</span>, indicating coeval formation time. Taking all the four diabase dykes into consideration, two different types, OIB-type and weak enriched-type, can be summarized. The “OIB-type” samples, including T1193-A and T0907 dykes, show OIB-like geochemical features and have initial Sr-Nd isotopic values similar with most mafic products in Comei Large Igneous Provinces (LIP), suggesting that they represent melts directly generated from the Kerguelen mantle plume. The “weak enriched-type ” samples, including T1194-A and T0902 dykes, have REEs and trace element patterns showing within-plate affinity but have obvious Nb-Ta-Ti negative anomalies. They show uniform lower <em>ε</em>_Nd(<em>t</em>) values (–6––2) and higher ⁸⁷Sr/⁸⁶Sr(<em>t</em>) values (0.706–0.709) independent of their MgO variation, indicating one enriched mantle source. Considering their closely spatial and temporal relationship with the widespread Comei LIP magmatic products in Tethyan Himalaya, these “weak enriched-type” samples are consistent with mixing of melts from mantle plume and the above ancient Tethyan Himalaya subcontinental lithospheric mantle (SCLM) in different proportions. These weak enriched mafic rocks in Comei LIP form one special rock group and most likely suggest large scale hot mantle plume-continental lithosphere interaction. This process may lead to strong modification of the Tethyan Himalaya lithosphere in the Early Cretaceous.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000570/pdfft?md5=06f477356c3e6a6f9efc0166fa64de7c&pid=1-s2.0-S2096519224000570-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74896089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cassiterite U-Pb dating of the Yelonggou pegmatite-type lithium deposit in western Sichuan and its metallogenic age constraints","authors":"Xiang-yuan Yue ,&nbsp;Qian Zhang ,&nbsp;Jun-jun Zhang ,&nbsp;Wei Zhang ,&nbsp;Jing Zhang ,&nbsp;Zhi-quan Jia ,&nbsp;Li-ping Luo","doi":"10.31035/cg2023047","DOIUrl":"https://doi.org/10.31035/cg2023047","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000648/pdfft?md5=03ef34b807a78e4c4d7ae8843c039f03&pid=1-s2.0-S2096519224000648-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin, South China Sea","authors":"Jin-feng Ren ,&nbsp;Hai-jun Qiu ,&nbsp;Zeng-gui Kuang ,&nbsp;Ting-wei Li ,&nbsp;Yu-lin He ,&nbsp;Meng-jie Xu ,&nbsp;Xiao-xue Wang ,&nbsp;Hong-fei Lai ,&nbsp;Jin Liang","doi":"10.31035/cg2023086","DOIUrl":"https://doi.org/10.31035/cg2023086","url":null,"abstract":"<div><p>Many locations with concentrated hydrates at vents have confirmed the presence of abundant thermogenic gas in the middle of the Qiongdongnan Basin (QDNB). However, the impact of deep structures on gas-bearing fluids migration and gas hydrates distribution in tectonically inactive regions is still unclear. In this study, the authors apply high-resolution 3D seismic and logging while drilling (LWD) data from the middle of the QDNB to investigate the influence of deep-large faults on gas chimneys and preferred gas-escape pipes. The findings reveal the following: (1) Two significant deep-large faults, F1 and F2, developed on the edge of the Songnan Low Uplift, control the dominant migration of thermogenic hydrocarbons and determine the initial locations of gas chimneys. (2) The formation of gas chimneys is likely related to fault activation and reactivation. Gas chimney 1 is primarily arises from convergent fluid migration resulting from the intersection of the two faults, while the gas chimney 2 benefits from a steeper fault plane and shorter migration distance of fault F2. (3) Most gas-escape pipes are situated near the apex of the two faults. Their reactivations facilitate free gas flow into the GHSZ and contribute to the formation of fracture - filling hydrates.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000545/pdfft?md5=dab51f4d0a130f0012c385101ea3d530&pid=1-s2.0-S2096519224000545-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A potential giant gallium deposit hosted in the tailing dam of the Fankou Zn-Pb deposit in northern Guangdong Province, South China","authors":"Peng-peng Yu ,&nbsp;Zhao-bin Hu ,&nbsp;Yi Zheng ,&nbsp;Lan-xuan Guo ,&nbsp;Shi-yuan Ouyang ,&nbsp;Gui-qiang Yuan ,&nbsp;Shang-zhou Chen ,&nbsp;Cheng-ming Wang ,&nbsp;Xi Chen","doi":"10.31035/cg2023043","DOIUrl":"https://doi.org/10.31035/cg2023043","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209651922400065X/pdfft?md5=247e0acad706f5cf4267c671b812c137&pid=1-s2.0-S209651922400065X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon emission reduction: Contribution of geothermal energy and practice in China","authors":"Liang Wang ,&nbsp;Li-qiong Jia","doi":"10.31035/cg2023088","DOIUrl":"https://doi.org/10.31035/cg2023088","url":null,"abstract":"","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000661/pdfft?md5=0d1c65b684bbf16396f226dc60247c5e&pid=1-s2.0-S2096519224000661-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China","authors":"Li-zhi Shi ,&nbsp;Zhuo-zhuo Wang ,&nbsp;Zhan-tao Xing ,&nbsp;Shan Meng ,&nbsp;Shuai Guo ,&nbsp;Si-miao Wu ,&nbsp;Li-yan Luo","doi":"10.31035/cg2022072","DOIUrl":"10.31035/cg2022072","url":null,"abstract":"<div><p>The Daqing exploration area in the northern Songliao Basin has great potential for unconventional oil and gas resources, among which the total resources of tight oil alone exceed 10⁹ t and is regarded as an important resource base of Daqing oilfield. After years of exploration in the Qijia area, Songliao Basin, NE China, tight oil has been found in the Upper Cretaceous Qingshankou Formation. To work out tight oil’s geological characteristics, taking tight oil in Gaotaizi oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, this paper systematically analyzed the geological characteristics of unconventional tight oil in Gao3 and Gao4 layers of the Qijia area, based on the data of the geological survey, well drilling journey, well logging, and test. It is that three sets of hydrocarbon source rocks (K₂<em>qn</em>₁, K₂<em>qn</em>₂₊₃, and K₂<em>n</em>₁) develop in the examined area, and exhibit excellent type I and II kerogens, high organic matter abundance, and moderate maturity. The reservoir is generally composed of thin-bedded mudstone, siltstone, and sandstone, and presents poor porosity (average 8.5 vol.%) and air permeability (average 4 mD). The main reservoir space primarily includes intergranular pores, secondary soluble pores, and intergranular soluble pores. Three types of orifice throats were identified, namely fine throat, extra-fine throat, and micro-fine throat. The siltstone is generally oil-bearing, the reservoirs with slime and calcium become worse oil-bearing, and the mudstone has no obvious oil-bearing characteristics. The brittleness indices of the sandstone in the tight oil reservoir range from 40% to 60%, and those of the mudstone range from 40% to 45%, indicating a better brittleness of the tight oil reservoir. Based on the study of typical core hole data, this paper gives a comprehensive evaluation of the properties of the tight oil and establishes a tight oil single well composite bar chart as well as the initial evaluation system with the core of properties in the tight oil reservoir. This study has theoretical guiding significance and practical application value for tight oil exploration and evaluation in the Qijia area.</p><p>©2024 China Geology Editorial Office.</p></div>","PeriodicalId":45329,"journal":{"name":"China Geology","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2096519224000557/pdfft?md5=245b4a0f2c429540a045a504102f83ae&pid=1-s2.0-S2096519224000557-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84724070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}