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Stability of loess high-fill slope based on monitored soil moisture changes

Research in Cold and Arid Regions 2023年第4期15卷 191-201页

作者： XueLing Yong Yu Zhang YunLong Hou BingBing Han Ning An Hui Zhang Ying Ma School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhouGansu 730070China Key Laboratory of Railway Industry of Plateau Railway Transportation Intelligent Management and Control Lanzhou Jiaotong UniversityLanzhouGansu 730070China gansu institute of Engineering geology LanzhouGansu 730030China School of Civil Engineering Lanzhou Jiaotong UniversityLanzhouGansu 730070China

This paper aims to assess the influence of moisture content changes during rainfall on the stability of loess high-fill slopes by taking a loess high-fill slope in Lanzhou City as an ***,according to the moisture content monitoring data collected from a slope online monitoring system,direct shear tests were performed on soil samples of different moisture content to determine the relationship between the shear strength parameters and moisture ***,a coupled hydro-mechanical model with soil shear strength related to moisture content was established and used to analyze 16 working conditions with various rainfall intensities and durations for two cases:shear strength parameters from the site exploration report and those from this ***,the results from the two cases were compared regarding the changes in stresses and displacements after rainfall infiltration to analyze the influence of moisture content on the stability of loess high-fill *** conclusions are as follows:(1)Segmental relationship equations of cohesion and angle of internal friction were established for loess with various moisture content.(2)Under the conditions of different rainfall intensities,significant differences were observed in the trends of slope stress and displacement changes.(3)The slope displacement occurred in the shallow soil layer within about 12.5 m from the slope top,and the plastic strain concentrated in the soil layer within about 6 m from the slope top.(4)The results of slope stability analyses based on moisture content monitoring data are more in line with the observed.

关键词： Rainfall infiltration Seepage stress coupling Loess High fill slope Stability

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A method for identifying coalbed methane co-production interference based on production characteristic curves: A case study of the Zhijin block, western Guizhou, China

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Petroleum exploration and Development 2022年第5期49卷 1126-1137页

作者： GUO Chen QIN Yong YI Tongsheng CHEN Zhenlong YUAN Hang GAO Junzhe GOU Jiang College of geology and Environment Xi'an University of Science and TechnologyXi'an 710054China Shaanxi Provincial Key Laboratory of Geological Support for coal Green Exploitation Xi'an 710054China Geological Research institute for coal Green Mining Xi'an University of Science and TechnologyXi'an 710054China Key Laboratory of CBM Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China Guizhou Bureau of coal Geological exploration Guiyang 550008China East China Oil&Gas Company SinopecNanjing 210011China

Efficient detection of coalbed methane(CBM) co-production interference is the key to timely adjusting the development plan and improving the co-production efficiency. Based on production data of six typical CBM co-production wells in the Zhijin block of western Guizhou province, China, the production characteristic curves, including production indication curve, curve of daily water production per unit drawdown of producing fluid level with time, and curve of water production per unit differential pressure with time have been analyzed to explore the response characteristics of co-production interference on the production characteristic curves. Based on the unit water inflow data of pumping test in coal measures, the critical value of in-situ water production of the CBM wells is 2 m^(3)/(d·m). The form and the slope of the initial linear section of the production indication curves have clear responses to the interference, which can be used to discriminate internal water source from external water source based on the critical slope value of 200 m^(3)/MPa in the initial linear section of the production indication curve. The time variation curves of water production per unit differential pressure can be divided into two morphological types: up-concave curve and down-concave curve. The former is represented by producing internal water with average daily gas production greater than 800 m^(3)/d, and the latter produces external water with average daily gas production smaller than 400 m^(3)/d. The method and critical indexes for recognition of CBM co-production interference based on the production characteristic curve are constructed. A template for discriminating interference of CBM co-production was constructed combined with the gas production efficiency analysis, which can provide reference for optimizing co-production engineering design and exploring economic and efficient co-production mode.

关键词： coalbed methane multi-seam co-production interlayer interference production indication curve external water internal water discrimination template

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Platinum and Palladium Abundances in Floodplain Sediments and Their Geochemical provinces

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Chinese Journal Of Geochemistry 1999年第1期18卷 18-24页

作者：成杭新谢学锦严光生沈夏初顾铁新赖志敏陈方伦 institute of Geophysical and Geochemical exploration Ministry of Geology and Mineral Resources Langfang Changchun geology College Changchun Bureau of geology and Mineral Resources of Henan province Zhengzhou

Results obtained from the wide spaced floodplain sediments indicate that the abundances of Pt and Pd in floodplain sediments are 0.46 ng/g and 0.40 ng/g, respectively. Three geochemical provinces, Yunnan Guizhou, Xinj... 详细信息

关键词：铂钯富集地球化学泛滥平原沉积物 Pt Pd 成矿作用

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Infuence of urbanization on schistosomiasis infection risk in Anhui province based on sixteen year’s longitudinal surveillance data:a spatio-temporal modelling study

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Infectious Diseases of Poverty 2023年第6期12卷 99-100页

作者： Xin Liu Yang Sun Yun Yin Xiaofeng Dai Robert Bergquist Fenghua Gao Rui Liu Jie Liu Fuju Wang Xiao Lv Zhijie Zhang College of Geodesy and Geomatics Shandong University of Science and Technology Qingdao China No. 8 institute of geology and Mineral Resources exploration of Shandong province Rizhao China School of Public Health Fudan University Shanghai China Key Laboratory of Public Health Safety Ministry of Education Shanghai China Ingerod Brastad Sweden Anhui institute of Schistosomiasis Control Hefei China

Background Urbanization greatly afects the natural and social environment of human existence and may have a multifactoral impact on parasitic ***,a common parasitic disease transmitted by the snail Oncomelania hupensis,is mainly found in areas with population aggregations along rivers and lakes where snails *** studies have suggested that factors related to urbanization may infuence the infection risk of schistosomiasis,but this association remains *** study aimed to analyse the efect of urbanization on schistosomiasis infection risk from a spatial and temporal perspective in the endemic areas along the Yangtze River Basin in *** County-level schistosomiasis surveillance data and natural environmental factor data covering the whole Anhui province were *** urbanization level was characterized based on night-time light data from the Defense Meteorological Satellite Program Operational Linescan System(DMSP-OLS)and the National Polar-Orbiting Partnership’s Visible Infrared Imaging Radiometer Suite(NPP-VIIRS).The geographically and temporally weighted regression model(GTWR)was used to quantify the infuence of urbanization on schistosomiasis infection risk with the other potential risk factors *** regression coefcient of urbanization was tested for signifcance(α=0.05),and the infuence of urbanization on schistosomiasis infection risk was analysed over time and across space based on signifcant regression *** studied included climate,soil,vegetation,hydrology and *** The mean regression coefcient for urbanization(0.167)is second only to the leached soil area(0.300),which shows that the urbanization is the most important infuence factors for schistosomiasis infection risk besides leached soil *** other important variables are distance to the nearest water source(0.165),mean minimum temperature(0.130),broadleaf forest area(0.105),amount of precipitation(0.073),surface t

关键词： Urbanization Night-time light data Schistosomiasis Spatio-temporal analysis Geographically and temporally weighted regression

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Characteristics of Light Hydrocarbons （C1-C7） in Mesozoic and Paleozoic Rocks in the Jurong Basin of Jiangsu province, China

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Acta Geochimica 1987年第1期6卷 76-86页

作者：徐伟民 institute of geology Petroleum exploration and Development Company Jiangsu province China

Characteristics have been studied of light hydrocarbons （C1-C7） from crude oils and source rocksranging from Devonian to Triassic in age in the Jurong Basin where carbonate rocks are dominating. Theresults show that light hydrocarbon compositions （C1-C7） can be used to classify organic matter types andmaturities as well as to make oil-source rock correlations. It is also an effective method in organicgeochemical studies of oils, gases and source rocks in terrains of old carbonate rocks.

关键词： Characteristics of Light Hydrocarbons C1-C7 in Mesozoic and Paleozoic Rocks in the Jurong Basin of Jiangsu province

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Fission Track Thermochronology Evidence for Multiple Periods of Mineralization in the Wulonggou Gold Deposits, Eastern Kunlun Mountains, Qinghai province

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Journal of Earth Science 2013年第4期24卷 471-478页

作者：袁万明莫宣学张爱奎陈小宁段宏伟李希郝娜娜王先美 School of Earth Sciences and Resources China University of Geosciences No. 3 exploration institute of geology and Mineral Resources of Qinghai province exploration and Production Research institute China Petroleum & Chemical Corporation

It is a puzzle to determine metallogenetic ages in the world. This article uses zircon fission track （FT） dating to probe the mineralizing epochs of Wulonggou （五龙沟） gold ore deposits in eastern Kunlun （昆仑） Mountains. Total of six zircon FT ages have been obtained and can be divided into groups of 235-216 and 197-181 Ma, as well as 162 and 124 Ma, revealing multiple epochs of metalloge- netic processes took place in Wulonggou area, mainly first two age groups. The mineralizing ages be- come lower from northeast Yanjingou （岩金沟） to southwest Hongqigon （红旗沟）. The second epoch of 197-181 Ma is first achieved by this work. It is shown that the FT ages consist with other isotopic data and reflect different regional thermotectonic events.

关键词： metallogenetic age mineralizing time fission track thermochronology gold deposit,Wulonggou eastern Kunlun Mountains.

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Source and Enrichment Mechanism of Lithium in the Triassic Argillaceous Marine Sediments from Huangjinkou, Sichuan, China

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 536-545页

作者： QIN Yan WANG Denghong ZHAO Yue YU Yang GAO Juanqin YU Feng ZHONG Jiaai LIU Zhu Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural ResourcesInstitute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China School of Earth Science and Resources China University of GeosciencesBeijing 100083China The 405 Geological Team Sichuan Province Geology and Mineral Exploration and Development BureauDujiangyanSichuan 611830China

In the Triassic marine sediments, an obvious enrichment of lithium has been found. The source and enrichment mechanism of lithium is unknown. Here, we report trace and rare earth element and isotope analyses for Triassic sedimentary samples from core ZK601, recovered from the Huangjinkou anticline in the Xuanhan basin. Lithium concentrations from the Leikoupo and Jialingjiang formations are much higher than the average concentrations in the crust of eastern China and in other marine sediments. Lithium concentrations are highest at depths of 3300–3360 m(in argillaceous marine sediments), and Li is positively correlated with Rb, Ga, Zr, Nb and other trace elements. The range of δ^(7)Li values in our samples is consistent with that in other Triassic marine carbonate rocks. Lithium concentrations and isotope ratios are negatively correlated in the argillaceous dolomite samples at depths of 3300–3360 m. We compared the results in this study with trace and rare earth elements in the clay from Sichuan and Chongqing, and propose that the clay in the argillaceous marine evaporites from Huangjinkou formed via the hydrolysis of volcanic ash during Early–Middle Triassic volcanic eruptions into brine basins, during which clay adsorbed Li from the brine and formed Li-rich argillaceous dolomites. The addition and hydrolysis of volcanic ash in the evaporative brine is also related to the formation of a new type of polyhalite.

关键词： lithium argillaceous marine sediments clay Triassic Xuanhan salt basin

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Sequence-lithofacies paleogeographic characteristics and petroleum geological significance of Lower Permian Qixia Stage in Sichuan Basin and its adjacent areas,SW China

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Petroleum exploration and Development 2022年第6期49卷 1295-1309页

作者： LI Minglong TAN Xiucheng YANG Yu NI Hualing LUO Bing WEN Long ZHANG Benjian XIAO Di XU Qiang CNPC Key Laboratory of Carbonate Reservoirs Southwest Petroleum University DivisionChengdu 610500China Sichuan province Key Laboratory of Natural Gas geology Chengdu 610500China State Key Laboratory of Oil and Gas Reservoir geology and exploration Southwest Petroleum UniversityChengdu 610500China PetroChina Southwest Oil and Gas Field Company Chengdu 610000China Southwest Geophysical Research institute BGPCNPCChengdu 610213China

Through the analysis of logging,field outcrops,cores and geochemical data,and based on the study of the relationships between sea level changes,sequence filling,paleo-geomorphy and lithofacies,the sequence lithofacies paleo-geography and evolution process of the Lower Permian Liangshan-Qixia Formation(Qixia Stage for short)in Sichuan Basin and its surrounding areas are *** Qixia Stage can be divided into three third-order sequences,in which SQ0,SQ1 and SQ2 are developed in the depression area,and SQ1 and SQ2 are only developed in other *** paleo-geomorphy reflected by the thickness of each sequence indicates that before the deposition of the Qixia Stage in the Early Permian,the areas surrounding the Sichuan Basin are characterized by“four uplifts and four depressions”,namely,four paleo-uplifts/paleo-lands of Kangdian,Hannan,Shennongjia and Xuefeng Mountain,and four depressions of Chengdu-Mianyang,Kangdian front,Jiangkou and Yichang;while the interior of the basin is characterized by“secondary uplifts,secondary depressions and alternating convex-concave”.SQ2 is the main shoal forming period of the Qixia Formation,and the high-energy mound shoal facies mainly developed in the highs of sedimentary paleo-geomorphy and the relative slope break *** distribution of dolomitic reservoirs(dolomite,limy dolomite and dolomitic limestone)has a good correlation with the sedimentary geomorphic highs and slope break *** favorable mound-shoal and dolomitic reservoirs are distributed around depressions at platform-margin and along highs and around sags in the *** is pointed out that the platform-margin area in western Sichuan Basin is still the key area for exploration at present;while areas around Chengdu-Mianyang depression and Guangwang secondary depression inside the platform and areas around sags in central Sichuan-southern Sichuan are favorable exploration areas for dolomitic reservoirs of the Qixia Formation in the next step.

关键词： Sichuan Basin Lower Permian Qixia Stage sequence stratigraphy three-order sequence mound-shoal complex carbonate platform reservoir lithofacies paleogeography

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Effects of volcanic activity on organic matter sources and the paleoenvironment: Geochemical evidence from Upper Carboniferous source rocks(Batamayineishan Formation) in eastern Junggar， NW China

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Journal of Earth Science 2022年

作者： Ming Shao Tianzhu Lei Shuncun Zhang Shengyin Zhang Yu Pei Sen Song Northwest institute of Eco-Environment and Resources， Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Petroleum Resources， gansu province/Key Laboratory of Petroleum Resources Research， institute of geology and Geophysics， Chinese Academy of Sciences

The mudstone， gray tuffite and carbonaceous shale in the Upper Carboniferous Batamayineishan Formation （Bashan Fm.） are essential source rocks for the volcanic reservoir in eastern Junggar， northwestern China. The kerogen components， vitrinite reflectance， Rock-Eval pyrolysis， lipid biomarkers and isotope compositions were measured to understand the provenance and depositional environment of Bashan Fm. under the background of volcanic activities. There were 10 and 4 periods of volcanic eruptions identified in the CS and DZ Wells， respectively. The source rocks developed in the late or intermittent phase of volcanic activity. The original island arcs of the early Carboniferous evolved into the Wucaiwan Sag and the Dishuiquan Sag in the Bashan Fm. The Wucaiwan Sag inherited the restricted， closed residual sea， which had a slightly anoxic and hypersaline environment. The Dishuiquan Sag was generally an oxidizing lacustrine environment， influenced by a marine transgression that may have occurred at the end of the DZ;period during the Late Carboniferous. Although the total organic matter decreased due to the volcanic eruption， ash could cause an increase of aquatic organisms， coinciding with increases in salinity and reducibility in the Dishuiquan Sag.

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Geochemical significance of the Paleogene soda-deposits bearing strata in Biyang Depression,Henan province

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Science China Earth Sciences 2015年第10期58卷 129-137页

作者： YANG JiangHai YI ChengLong DU YuanSheng ZHANG ZongHeng YAN JiaXin State Key Laboratory of Biogeology and Environmental geology China University of Geosciences Geological exploration institute of Henan Henan Provincial Bureau of Geo-exploration and Mineral Development

The Biyang Depression,lying in the eastern Nanxiang Basin,has a dustpan-shape with faults developed to the southwest and *** Paleogene Hetaoyuan Formation in this depression hosts one of the oldest soda-deposits,the Anpeng *** sodium carbonate-bearing strata consist of lutites,muddy dolomites,and bedded soda-deposits,which are dominated by nahcolite with little trona,mirabilite,and *** the top Unit 3 and lower Unit 2 of Hetaoyuan Formation where the sodium carbonates are concentrated,dolomitic shale,muddy carbonate,and sodium carbonate can be separated based on their distinct Al2O3,Ti O2,Na2O,Mg O+Ca O,and LOI(loss on ignition)*** using Na2O/(Mg O+Ca O)ratio as an indicator for the relative concentration of Na carbonates to Mg-Ca carbonates,the muddy dolomites can be classified into two *** group with Na2O/(Mg O+Ca O)0.6 presents a negative *** the clastic proportion decreases,the former indicates that it tends to form pure Mg-Ca carbonates reflecting evaporation less than or equal to replenishment for the lake water in a relative humid climate,and the latter reveals a trend to form sodium carbonates with lake water’s evaporation more than replenishment in a relatively dry *** muddy dolomite to sodium carbonate samples,with Na2O/(Mg O+Ca O)ratio increasing,the Al normalized Zr,Ti,La,K,Rb,and Ba tend to be enriched and the post-Archean Average Shale(PAAS)normalized positive Eu anomaly becomes more *** with the high B contents and the report of searlesite in the bedded sodium carbonates and the regional extensional tectonic regime,the above geochemical characteristics were interpreted to signify hydrothermal contribution to forming these soda-deposits through the deep fault systems of basin margins.

关键词：泌阳凹陷地球化学意义古近系苏打存款地层河南省比例关系

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