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Characteristics of shallow geothermal fields in major cities of Tibet Autonomous Region

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Journal of Groundwater Science and engineering 2019年第1期7卷 77-85页

作者： YANG Hai-jun DONG Jian-xing SUN Dong HUANG Rui chengdu hydrogeology and engineering geology center Sichuan Bureau of Geology and Mineral Resources

Based on the project titled "Investigation and evaluation of shallow geothermal energy in major cities of Tibet Autonomous Region", the distribution characteristics and occurrence conditions of shallow geothermal fields in these cities were introduced in this paper. To this end, relevant data in Lhasa, Shigatse and Nyingchi Cities through vertical thermometry was a focus, so as to analyze groundwater temperature and the distribution law of strata with constant temperature. Then through comprehensive comparisons and analysis of the relationship between groundwater temperature and climate, differences in this aspect of Nagqu City were taken as a typical case to clarify formation of geothermal field and corresponding influence on groundwater temperature, furthermore providing basic data for rational development and utilization of shallow geothermal energy in Tibet Autonomous Region.

关键词： Shallow geothermal field Groundwater temperature Climate Vertical thermometry Stratum of constant temperature

Analysis of hydrogeolgical characteristics and water environmental impact pathway of typical shale gas exploration and development zones in sichuan Basin, China

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Journal of Groundwater Science and engineering 2019年第3期7卷 195-213页

作者： SUN Dong LIU Xin-ze YANG Hai-jun CAO Nan ZHANG Zhi-peng CHEN Yin-song LI Da-meng chengdu hydrogeology and engineering geology center Sichuan Bureau of Geology and Mineral Exploration and DevelopmentChengdu 610081China sichuan Environmental Protection engineering and Technology center for Groundwater Pollution Prevention and Control Chengdu 610081China sichuan Huadi New Energy and Environmental Protection Technology Co. Ltd.Chengdu 610081China

Studying the influence of shale gas exploration and development on groundwater environment is the basis of guiding water environment protection in the process of shale gas exploration and *** environmental pollution is concealed,complex and *** it is difficult to control the pollution,the current commercial shale gas development zones in sichuan Basin that are mostly located in karst areas and highly sensitive to groundwater will be vulnerable to the impact of shale gas exploration and *** on the hydrogeological conditions of shale gas exploration and development area and combined with engineering analysis of exploration and development,various risk pathways that may affect the groundwater environment during process of shale gas exploration,mining well construction,mining operations and other stages were identified in this *** existing risk pathways were proved by verification of typical areas and should not be *** on the actual situation of typical areas,the countermeasures of groundwater environmental protection in the process of shale gas exploration and development in karst areas were *** is believed that the groundwater environment can be better protected by strengthening administration,research and application of new technologies,precise design,hydrogeological conditions,and research and feedback of groundwater environmental protection.

关键词： Groundwater environment Shale gas Impact pathway analysis

Ore prospecting model and targets for the Dashuigou tellurium deposit, sichuan Province, China

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Acta Geochimica 2018年第4期37卷 578-591页

作者： Quanjiang Zhang Yingping Liu Mingyou He Jun Bai Wei Xu Cong Zhao College of Earth Sciences Chengdu University of Technology 610059 No. 1 Dongsan Road ErxianqiaoChenghua District Chengdu City Sichuan Province China sichuan Geological Survey No. 25 North Renmin RoadJinniu District 610081 Chengdu City Sichuan ProvinceChina chengdu center of hydrogeology and engineering geology sichuan bureau of geology and mineral exploration and development 2nd Section of North Yihuan Road 3 Jinniu District 610081 Chengdu City Sichuan Province China

The Dashuigou tellurium(Te) deposit in Shimian city, sichuan Province is the only known independent Te ore deposit in China. Samples were collected by1/50,000 stream sediment survey and analyzed by inductively coupled plasma–mass spectrometry, X-ray fluorescence spectrometry, emission spectrometry, and atomic absorption spectroscopy. An ore prospecting model for the Dashuigou Te deposit was then established. In the Dashuigou area, bismuth(Bi), Te, and gold(Au) concentrations in stream sediment samples displayed weak-positive anomalies, while silver(Ag) displayed a weaknegative anomaly. Bi, Te, Ag, and Au anomalies are regarded as indicators of Te deposits; the greater the ratio of Te+Bi/Au+Ag, the larger the possibility of an independent tellurobismuthite deposit. The ratio calculated from our samples is 7.288. Five locations were identified for prospecting for Te minerals by this model, including the northern part of the Dashuigou Te deposit, Majiagou,Tizigou, southeastern Miaoping, and northern *** five regions are within the Dashuigou dome anticline, the exposed strata of which are controlled by tracing the tensile shear fracture; the metallogenic geological conditions and geochemical characteristics are the same as those of the known Dashuigou Te deposit. Already, Te–Bi veins have been found in some of these areas.

关键词： 1/50,000 steam sediment survey Oreprospecting model and targets Dashuigou Te deposit sichuan Province

Early warning model for slope debris flow initiation

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Journal of Mountain Science 2018年第6期15卷 1342-1353页

作者： LI Ming-li JIANG Yuan-jun YANG Tao HUANG Qiang-bing QIAO Jian-ping YANG Zong-ji Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciences Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China chengdu center of hydrogeology and engineering geology of sichuan bureau of geology&mineral Resources Chengdu 610000China Department of Geological engineering Chang'an UniversityXi'an 710054China

Early warning model of debris flow is important for providing local residents with reliable and accurate warning information to escape from debris flow hazards. This research studied the debris flow initiation in the Yindongzi gully in Dujiangyan City, sichuan province, China with scaled-down model experiments. We set rainfall intensity and slope angle as dominating parameters and carried out 20 scaled-down model tests under artificial rainfall conditions. The experiments set four slope angles(32°, 34°, 37°, 42°) and five rainfall intensities(60 mm/h, 90 mm/h, 120 mm/h, 150 mm/h, and 180 mm/h) treatments. The characteristic variables in the experiments, such as, rainfall duration, pore water pressure, moisture content, surface inclination, and volume were monitored. The experimental results revealed the failure mode of loose slope material and the process of slope debris flow initiation, as well as the relationship between the surface deformation and the physical parameters of experimental model. A traditional rainfall intensity-duration early warning model(I-D model) was firstly established by using a mathematical regression analysis, and it was then improved into ISD model and ISM model(Here, I is rainfall Intensity, S is Slope angle, D is rainfall Duration, and M is Moisture content). The warning model can provide reliable early warning of slope debris flow initiation.

关键词： Slope debris flow Artificial rainfallmodel Early warning model Model experiment

A collaborative strategy for enhanced reduction of Cr(Ⅵ) by Fe(0) in the presence of oxalate under sunlight:Performance and mechanism

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Journal of Environmental Sciences 2020年第4期32卷 385-394页

作者： Qi Zhou Yang Li Heng Yang Yun Gao College of Chemistry and Chemical engineering Anhui UniversityHefei 230601China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China chengdu Integrated Testing center of Rocks and Ores Sichuan Geology and Mineral Exploration and Development BureauChengdu 610081China Anhui Electric Power Construction Second engineering Co.Ltd. China Energy Construction GroupHefei 230000China

Nanometer-size zero-valent iron(NZVI)is an efficient reducing agent,but its surface is easily passivated with an oxide layer,leading to reaction *** our study,oxalate(OA)was introduced into this heterogeneous system of NZVI,which could form ferrioxalate complexes with the NZVI surface-bound Fe3+and dissolved Fe3+in the *** of ferrioxalate complexes can facilitate the generation of Fe2+from Fe3+and CO2·-radical,both species have strong reduction ***,a"photo-oxalate-Fe(0)"system through sunlight induction was established,which not only prohibited the formation of a surface passivation layer,but also displayed a synergetic mechanism of ferrioxalate photolysis to enhance reduction,exhibiting remarkably higher degradation activity(several times faster)toward the model pollutant Cr(Ⅵ)than the mechanism with NZVI *** tests suggested that both NZVI dosage and OA content markedly affected the reduction *** pH was beneficial to the reduction ***,recyclability experiment showed that the reduction rate decreased from 0.21706 to 0.03977 min-1 after three cycles of reuse due to the NZVI losing reaction activity generally,but the system still maintained considerable reduction ***,a mechanism was revealed whereby NZVI would transform to Fe oxides after the exhaustion of its reductive power,and the photolysis of ferrioxalate to promote the cycling of iron species played the predominant role in providing extra reduction *** features confirm that introduction of OA into Cr(Ⅵ)reduction by NZVI through sunlight induction is advantageous and promising.

关键词： Nanometer-size zero-valent iron Oxalate Sun irradiation Photolysis of ferrioxalate Cycling of surface iron Synergetic mechanism

Low-field NMR application in the characterization of CO_(2)geological storage and utilization related to shale gas reservoirs:a brief review

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Frontiers of Earth Science 2023年第3期17卷 739-751页

作者： Zhaohui LU Ke LI Xingbing LIU Peng ZHAO Jun LIU National and Local Joint engineering Research center of Shale Gas exploration and development Chongqing Institute of Geology and Mineral ResourceChongqing 401120China Key Laboratory of Shale Gas exploration(Ministry of Natural Resources) Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China MOE Key Laboratory of Deep Earth Science and engineering Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610065China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China Chongqing Institute of Geological Survey Chongqing 401122China

CO_(2)geological storage and utilization(CGSU)is considered a far-reaching technique to meet the demand of increasing energy supply and decreasing CO_(2)*** CGSUs related to shale gas reservoirs,experimental investigations have attracted variable methodologies,among which low-field NMR(LF-NMR)is a promising method and is playing an increasingly key role in reservoir ***,the application of this nondestructive,sensitive,and quick LF-NMR technique in characterizing CGSU behavior in shale gas reservoirs is ***,the basic principle of LF-NMR for 1H-fluid detection is introduced,which is the theoretical foundation of the reviewed achievements in this ***,the reviewed works are related to the LF-NMR-based measurements of CH_(4)adsorption capacity and the CO_(2)-CH_(4)interaction in shale,as well as the performance on CO_(2)sequestration and simultaneous enhanced gas recovery from ***,the reviewed achievements have exhibited a large potential for LF-NMR application in CGSUs related to shale gas reservoirs,although some limitations and deficiencies still need to be ***,some suggestions are proposed for a more responsible development of the LF-NMR ***,this review is helpful in promoting the expanding application of the LF-NMR technique in CGSU implementation in shale gas reservoirs.

关键词： CO_(2)/CH_(4)competitive adsorption shale gas reservoir CO_(2)geological storage gas recovery enhancement low-field NMR

Geothermal anomalies in the Xianshuihe area: Implications for tunnel construction along the sichuan-Tibet Railway, China

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地下水科学与工程:英文版 2023年第3期11卷 237-248页

作者： Feng Liu Wei Zhang Gui-ling Wang Shuai-chao Wei Chen Yue Guang-zheng Jiang Yu-zhong Liao Institute of hydrogeology and Environmental geology Chinese Academy of Geological ScienceShijiazhuang 050061China China University of Geosciences(Beijing) Beijing 100083China Technology Innovation center of Geothermal&Hot Dry Rock exploration and development Ministry of Natural ResourcesShijiazhuang 050061China chengdu University of Technology Chengdu 610059China

This study presents a comprehensively analysis of geothermal characteristics in the Xianshuihe geothermal area along the sichuan-Tibet Railway,using temperature logging,temperature monitoring and thermal conductivity measurement,and regional geothermal geological survey *** research focuses on the geothermal background,geothermal field,and their potential impact on the surrounding *** investigation reveals that the average heat flow value in the study area is approximately 73.0 mW/m^(2),significantly higher than the average terrestrial heat flow in China's Mainland(62.5 mW/m^(2)).This high terrestrial heat flow signifies a distinct thermal background in the *** addition,geothermal anomalies in the area are found to be closely associated with the distribution of hot springs along NW faults,indicating a strong control by the Xianshuihe fault *** study concludes that the region's favorable conditions for geothermal resources are attributed to the combination of high terrestrial heatflow background and water-conducting ***,these conditions also pose a potential threat of heat damage to the tunnels along the sichuan-Tibet *** evaluate the risk,the research takes into account the terrestrial heat flow,thermal conductivity of the tunnel surrounding rocks,characteristics of the regional constant temperature layer,as well as the distribution of hot springs and *** analysis specifically focuses on the thermal damage risk of Kangding 1# tunnel and 2# tunnel passing through the study *** on the findings,it is determined that Kangding 1# tunnel and 2# tunnel have relatively low risk of heat damage,as they have avoided most of the high temperature anomaly ***,several sections of the tunnels do traverse zones with low to medium temperatures,where surface rock temperatures can reach up to 45℃.Therefore,these regions should not be neglected during the construction and operation of the tunnel project,and mitigation measu

关键词： Xianshuihe geothermal zone Terrestrial heat flow Hot spring Tunnel Heat damage

Geotectonic Evolution and Metallogenesis in the Nujiang-Lancang-Jinsha Rivers Area, China

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Journal of Geological Resource and engineering 2014年第3期2卷 139-150页

作者： Zou Guangfu Zou Xin Mao Ying Mao Qiong Xia Tong chengdu Institute of geology and mineralResources China Geological Survey Chengdu 610082 China Department of Psychology Peking University Beijing 100871 China chengdu Comprehensive Rock and mineral Testing center Sichuan Bureau of Geology and Mineral Resources Chengdu 610081China Research Institute of Petroleum exploration and development North China Oil Field Company PetroChin Renqiu 062552China China Ocean Press Beijing 100081 China

The studied area lies in the eastern sector of the Tethys. Since the Early Paleozoic, the Nujiang-Lancang-Jinsha Rivers （southwest Sanjiang） area has experienced the geological evolutionary phase of the Paleo-Tethys, Meso-Tethys and Neo-Tethys. The multiple tectonic-magmatic activities have been occurred in the region, which have provided very favorable conditions. According to the regional geological characteristics, Geotectonic position is the area which can be divided into the following tectonic units： Kekexili-Yajiang passive continental margin, Garze-Litang plate junction, Dege-Zhongdian plate, Jinshajiang-Ailaoshan plate junction, Changdu-Simao plate, Lanchangjiang plate junction, Zuogong-Baoshan plate, Nujiang plate junction, Bomi-Tengchong plate and nine mineralization zones （Kekexili-Yajiang mineralization zone, Garze-Litang mineralization zone, Dege-Zhongdian mineralization zone, Jinshajiang-Ailaoshan mineralization zone, Changdu-Simao mineralization zone, Lanchangjiang mineralization zone, Zuogong-Baoshan mineralization zone, Nujiang mineralization zone and Bomi-Tengchong mineralization zone）. The authors discussed that the geotectonic evolution specializes are relative to the main mineralization in this region. These studies show the geotectonic evolution and mineralization in the Nujiang-Lancang-Jinsha Rivers area have gone through eight stages for the Cambrian. Because the tectonic-magmatic mineralization activities have occurred the rich minerals resources and ore deposit types have been forming in this region. Ore deposits may be divided into seven types： massive sulfide type, stratabound type, turbidite type, postmag-matic hydrothermal type, skarn type, porphyry type and ductile shear zone type gold deposit. Deep geological effect of southwest Sanjiang area for deposit and its mineralization and ore prospecting and metallogenic prediction research work, is expected to find new orebody and ore deposit. The study of geotonics and metallogenesis in the

关键词： Geotectonic evolution mineralization ore deposits the Nujiang-Lancang-Jinsha rivers area.

Classification of hyperspectral images based on a convolutional neural network and spectral sensitivity

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2020年第3期21卷 240-248页

作者： Cheng-ming YE Xin LIU Hong XU Shi-cong REN Yao LI Jonathan LI Chongqing engineering Research center of Automatic Monitoring for Geological Hazards Chongqing 401120China Key Laboratory of Earth exploration and Information Technology of Ministry of Education Chengdu University of TechnologyChengdu 610059China National Breeding Base of Technology and Innovation Platform for Automatic-monitoring of Geologic Hazards Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of SciencesChengdu 610041China Department of Geography and Environmental Management University of WaterlooWaterlooN2L 3G1Canada

In recent years,deep learning methods have gradually come to be used in hyperspectral imaging *** of the peculiarity of hyperspectral imaging,a mass of information is contained in the spectral dimensions of hyperspectral ***,different ob jects on a land surface are sensitive to different ranges of *** achieve higher accuracy in classification,we propose a structure that combines spectral sensitivity with a convolutional neural network by adding spectral weights derived from predicted outcomes before the final classification ***,samples are divided into visible light and infrared,with a portion of the samples fed into networks during ***,two key parameters,unrecognized rate(δ)and wrongly recognized rate(γ),are calculated from the predicted outcome of the whole ***,the spectral weight,derived from these two parameters,is ***,the spectral weight is added and an improved structure is *** improved structure not only combines the features in spatial and spectral dimensions,but also gives spectral sensitivity a primary *** with inputs from the whole spectrum,the improved structure attains a nearly 2%higher prediction *** applied to public data sets,compared with the whole spectrum,on the average we achieve approximately 1%higher accuracy.

关键词： Hyperspectral imaging Deep learning Convolutional neural network(CNN) Spectral sensitivity