检索结果-南通市图书馆

Effects of artificially induced complete mixing on dissolved Organic matter in a stratified source water reservoir

Journal of Environmental Sciences 2022年第1期34卷 130-140页

作者： Lingyun Zhao Nan Li Tinglin Huang Haihan Zhang Fan Si Kai Li Yunzhi Qi Fengyao Hua Cheng Huang Key Laboratory of Northwest Water Resource Environment and EcologyMOEXi'an University of Architecture and TechnologyXi'an 710055China Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Xi'an Water Group HeiheJinpen Reservoir Management Company Xi'an 710016China

Naturally complete mixing promotes the spontaneous redistribution of dissolved oxygen(DO),representing an ideal state for maintaining good water quality,and conducive to the biomineralization of Organic matter.Water lifting aerators(WLAs)can extend the periods of complete mixing and increase the initial mixing temperature.To evaluate the influence of artificial-induced continuously mixing on dissolved Organic matter(DOM)removal performance,the variations of DOM concentrations,optical characteristic,environmental factors were studied after approaching the total mixing status via WLAs operation.During this process,the dissolved organic carbon reduced by 39.18%,whereas the permanganate index decreased by 20.47%.The optical properties indicate that the DOM became more endogenous and its molecular weight decreased.Based on the results of the Biolog Eco Plates,the microorganisms were maintained at a relatively high metabolic activity in the early stage of induced mixing when the mixing temperature was relatively high,whereas DOM declined at a high rate.With the continuous decrease in the water temperature,both the metabolic capacity and the diversity of aerobic microorganisms significantly decreased,and the rate of Organic matter mineralization slowed down.The results of this study demonstrate that the artificial induced mixing largely enhanced the removal DOM performance by providing a long period of aerobic conditions and higher initial temperature.

关键词： Artificial destratification systems Organic matter Lake and reservoir management EEMs-PARAFAC

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic matter occurrence and pore-forming mechanisms in lacustrine shales in China

引用

Petroleum Science 2022年第4期19卷 1460-1472页

作者： Li-Chun Kuang Lian-Hua Hou Song-Tao Wu Jing-Wei Cui Hua Tian Li-Jun Zhang Zhong-Ying Zhao Xia Luo Xiao-Hua Jiang Science and Technology R&D Department CNPCBeijing100000China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China National Energy Tight Oil and Gas R&D Center Beijing100083China Key Laboratory of Oil and Gas Reservoirs CNPCBeijing100083China

The evolution of pore structure in shales is affected by both the thermal evolution of Organic matter(OM)and by inorganic diagenesis,resulting in a wide variety of pore structures.This paper examines the OM distribution in lacustrine shales and its influence on pore structure,and describes the process of porosity development.The principal findings are:(i)Three distribution patterns of OM in lacustrine shales are distinguished;laminated continuous distribution,clumped distribution,and stellate scattered distribution.The differences in total organic carbon(TOC)content,free hydrocarbon content(S_(1)),and OM porosity among these distribution patterns are discussed.(ii)Porosity is negatively correlated with TOC and plagioclase content and positively correlated with quartz,dolomite,and clay mineral content.(iii)Pore evolution in lacustrine shales is characterized by a sequence of decreasing-increasing-decreasing porosity,followed by continuously increasing porosity until a relatively stable condition is reached.(iv)A new model for evaluating porosity in lacustrine shales is proposed.Using this model,the organic and inorganic porosity of shales in the Permian Lucaogou Formation are calculated to be 2.5%-5%and 1%-6.3%,respectively,which correlate closely with measured data.These findings may provide a scientific basis and technical support for the sweet spotting in lacustrine shales in China.

关键词： Shale oil Unconventional oil and gas Organic matter Pore evolution Log interpretation model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enrichment of Mississippi Valley-type(MVT) deposits in the Tethyan domain linked to Organic matter-rich sediments

引用

Science China Earth Sciences 2023年第12期66卷 2853-2870页

作者： Yucai SONG Zhiming YANG Liangliang ZHUANG SinoProbe Laboratory Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

The Tethyan domain hosts the world's most abundant hydrocarbon and Mississippi Valley-type(MVT) Pb-Zn resources. The relations among Organic matter-rich sediments, MVT Pb-Zn mineralization, and the Tethyan tectonic evolution history are an important scientific issue. The data of paleogeographic reconstruction indicate that the Proto-, Paleo-, and NeoTethys oceans mainly lay in low latitude areas between 30°N and 45°S. The high temperature and precipitation and the lack of sea water overturning in stagnant basins resulted in high marine biological productivity and good preservation conditions for Organic matter-rich sediments. Consequently, abundant Organic matter-rich sediments were developed and preserved in the Tethyan domain and thus created abundant hydrocarbon resources. Mineralization age data demonstrate that MVT deposits mainly formed during the continent-continent convergence in the late stage of the Tethyan tectonic evolution. Deposits are located in the fold-and-thrust belts and forelands of the continent-continent convergence orogen, and spatially associated with hydrocarbon basins. Organic matter-rich sediments are well developed in MVT ore districts, where hydrocarbon activity appeared earlier than or nearly simultaneous with the Pb-Zn mineralization event. Hydrocarbon activity generally began earlier than the Pb-Zn mineralization in individual deposits. Organic matter-rich sediments and hydrocarbons mainly play the role of reducing agents in the MVT Pb-Zn mineralization process. Through bacterial or thermal reduction, dissolved sulfates from sedimentary strata were reduced to generate reduced sulfur for Pb-Zn sulfide mineralization. In summary, the Tethyan oceans have long been in low latitude areas near the equator, making the Tethyan domain develop abundant Organic matterrich sediments and associated hydrocarbon resources which reduce sulfates to provide sufficient reduced sulfur for MVT PbZn mineralization in the region.

关键词： Tethyan domain Organic matter Mississippi Valley-type Pb-Zn deposit Low latitude Sulfate reduction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Amino acids as indicators of seasonal variations in Organic matter degradation in surface sediments from a shallow lake

引用

Journal of Environmental Sciences 2023年第9期131卷 1-10页

作者： Yan Wen Wenqiang Zhang Baoqing Shan Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Degradation of Organic matter(OM)in sediments is a key link in nutrient cycling and sedimentation processes in lakes.The aim of this study was to explore the degradation of OM in surface sediments of a shallow lake(Baiyangdian Lake,China)under seasonal temperature variations.For this,we used the amino acid-based degradation index(DI)and the spatiotemporal distribution characteristics and sources of OM.Sediment OM in the lake mainly originated from freshwater aquatic plants and terrestrial C4 plants.The sediment at some sampling sites was affected by surrounding crops.The organic carbon and total nitrogen contents,and the total hydrolyzed amino acid concentrations in the sediments were highest in summer and lowest in winter.The lowest DI occurred in spring,which indicated that the OM in the surface sediment at this time was highly degraded and relatively stable,and the highest DI occurred in winter,which showed that the sediment was fresh.The water temperature was positively correlated with the organic carbon content(p<0.01)and total hydrolyzed amino acids concentration(p<0.05).Seasonal variations in the overlying water temperature had a large effect on OM degradation in the lake sediments.Our results will facilitate the management and restoration of lake sediments that suffer from endogenous release of OM in a warming climate。

关键词： Sediment Organic matter Amino acid Temperature Degradation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geochemistry and heterogeneous accumulation of Organic matter in lacustrine basins:A case study of the Eocene Liushagang Formation in the Fushan Depression,South China Sea

引用

Petroleum Science 2022年第6期19卷 2533-2548页

作者： Bang Zeng Mei-Jun Li Ning Wang Yang Shi Fang-Zheng Wang Xin Wang State Key Laboratory of Petroleum Resources and Prospecting College of GeosciencesChina University of Petroleum(Beijing)Beijing102249China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of EducationCollege of Resources and EnvironmentYangtze UniversityWuhanHubei430100China Southern Oil Exploration and Development Company Petro ChinaHaikouHainan570216China

Determining the spatial distributions of organic-rich mudstones in hydrocarbon-bearing lacustrine basins is crucial for targeting exploration wells and discovering commercially viable petroleum accumulations.However,the strong heterogeneity of sedimentary systems and Organic matter(OM)input and accumulations make it difficult to identify OM-rich mudstones in lacustrine deposits.This paper takes the Eocene Liushagang Formation,in the Fushan Depression,South China Sea,as an example to clarify the relationship between the geochemical characteristics of OM and sedimentary facies.A practical approach is proposed for predicting the spatial distribution of good-quality source rocks with high OM contents.The method used is a combination of logging-based surface fitting and the mudstone to stratum thickness ratio(M/S ratio)of different depositional systems.It was found that this approach improved TOC content prediction both vertically and laterally.The results suggest that semi-deep lacustrine mudstones with predominantly aquatic organism input,deposited in suboxic-anoxic saline stratified water,contain more preserved OM than other mudstones.Using this method,limited areas on the southern slope of the lower Liushagang sequence(SQls3),the central part of the Huangtong Sag in the middle Liushagang sequence(SQls2),and the northern part of the Huangtong Sag in the upper Liushagang sequence(SQls1)are determined to be the best-quality source rocks in the development area.

关键词： Organic matter Geochemical characteristics Heterogeneous accumulation Areal distribution Lacustrine basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sources and degradation of Organic matter in the surface sediments of the Chukchi Sea:insights from amino acids

引用

Acta Oceanologica Sinica 2023年第11期42卷 9-18页

作者： Weiwei Li Zhongqiao Li Zhuoyi Zhu Alexander Polukhin Youcheng Bai Yang Zhang Futao Fang Haiyan Jin Anatolii S.Astakhov Xuefa Shi Jianfang Chen Key Laboratory of Marine Ecosystem and Biogechemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Shanghai Key Laboratory of Polar Life and Environment Sciences School of OceanographyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Polar Science of Ministry of Natural Resources Polar Research Institute of ChinaShanghai 201209China Laboratory of Biohydrochemistry Shirshov Institute of OceanologyRussian Academy of SciencesMoscow 117997Russia State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China V.I.Il’ichev Pacific Oceanological Institute Far Eastern BranchRussian Academy of SciencesVladivostok 690012Russia Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

In the context of global warming and rapid environment change in the Arctic,the supply of Organic matter(OM)has increased significantly and a large amount of OM are buried on the Arctic shelf.Studying the fate of OM in Arctic shelf sediments is crucial to understanding the global carbon sink.As a marginal sea of the Arctic Ocean,the Chukchi Sea is one of the most critical areas where OM is buried.Based on the surface sediment samples collected during the sixth Chinese National Arctic Research Expedition in the summer of 2014 and the SinoRussian joint Arctic Research Expedition in the summer of 2016,this study takes amino acids(AAs)as the primary tool to explore the source and degradation of OM in the surface sediments of the Chukchi Sea.This study shows that total hydrolyzable amino acid(THAA)concentrations(dry weight)are high,with a mean value of(32.7±15.8)μmol/g.Their spatial distribution is related to primary productivity,hydrodynamic conditions,sediment properties and other factors.The source of OM in the surface sediments of the Chukchi Sea is dominated by diatom-dominated marine productivity,with some input from terrestrial sources.Bacteria,as the main source of the D-enantiomer of AA(D-AA),not only have transforming effect on OM,but their cell walls and remnants likewise supply the OM pool.Based on a series of diagenetic indicators,we conclude that the OM in the surface sediments of the Chukchi Sea has undergone extensive degradation[DI(degradation index)=-0.59±0.44],and the degradation degree in the slope is higher than that in the shelf.This study uses AA to explore the sources and degradation of OM in the sediments of the Chukchi Sea,which facilitates our understanding of OM transport and transformation on the Arctic shelf.

关键词： Chukchi Sea amino acids degradation indicator Organic matter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic matter pore characteristics of over-mature marine black shale: a comparison of organic fractions with different densities

引用

Frontiers of Earth Science 2023年第1期17卷 310-321页

作者： Shitan NING Peng XIA Niuniu ZOU Yi ZHONG Yin YU Yuliang MOU Ke WANG College of Resources and Environmental Engineering Guizhou UniversityGuiyang 500025China Key Laboratory of Karst Georesources and Environment Ministry of Education Guizhou UniversityGuiyang 500025China School of Geosciences China University of PetroleumQingdao 266580China

Organic matter pores are considered to be the most important type of pore for preserving hydrocarbon gases in shale gas reservoirs.The Organic matter in each over-mature marine shale sample was separated into two organic fractions with densities of greater than and less than 1.25 g/cm^(3),and then their molecular compositions and pore characteristics were quantitatively evaluated using solid state 13C-nuclear magnetic resonance(NMR)and gas(N2 and CO_(2))adsorption analyses,respectively.The results revealed that aromatic carbon is the dominant molecular composition of the over-mature Organic matter in the Lower Cambrian Niutitang shale.During the over-mature stage,the organic fractions with densities of greater than and less than 1.25 g/cm^(3) have no significant differences in molecular composition.The organic fractions with densities of greater than and less than 1.25 g/cm^(3) do have significant differences in their organic pore characteristics.In contrast to the high density organic fraction,the low density fraction contained abundant micropores and lacked mesopores and macropores.The organic pore structures of the different occurrence states of Organic matter were significantly different.The C/O of Organic matter in different occurrence states are obviously different,which proves that the organic pore structure is closely related to both the occurrence state and density of the Organic matter.However,these relationships are still unclear and require further study.

关键词： pore characteristics Organic matter black shale Early Cambrian Yangtze Block

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of natural Organic matter on cadmium mobility in paddy soil: A review

引用

Journal of Environmental Sciences 2021年第6期33卷 204-215页

作者： Chaolei Yuan Qi Li Zhaoyang Sun Hongwen Sun Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China

Cadmium(Cd) contamination in paddy soil has caused public concern. The uptake of Cd by rice plants depends on soil Cd mobility, which is in turn substantially influenced by Organic matter(OM). In this review, we first summarize the fate of Cd in soil and the role of OM. We then focus on the effects of OM on Cd mobility in paddy soil and the factors influencing the remedial effectiveness of OM amendments. We further discuss the performance of straw incorporation in the remediation of Cd-contaminated paddy soils reported in laboratory and field studies. Considering the huge production of organic materials(such as straw) in agriculture, the use of natural OM for soil remediation has obvious appeal due to the environmental benefits and low cost. Although there have been successful application cases, the properties of OM amendments and soil can significantly affect the remedial performance of the OM amendments. Importantly, straw incorporation alone does not often decrease the mobility of Cd in soil or the Cd content in rice grains. Careful evaluation is required when considering natural OM amendments, and the factors and mechanisms that influence their remedial effectiveness need further investigation in paddy soil with realistic Cd concentrations.

关键词： Cadmium Mobility Organic matter Paddy soil Remediation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics and Sources of Organic matter from the Early Cambrian Niutitang Formtion and Its Preservation Environment in Guizhou

引用

Journal of Earth Science 2022年第4期33卷 933-944页

作者： Hong Wei Qinglai Feng Jianxin Yu Shan Chang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China

The Early Cambrian Niutitang Formation on the Yangtze Block is a set of high-quality marine source rock.However,hydrocarbon-forming organisms of these organic-rich shales was poorly understood.In this paper,the results of palynofacies analysis and hydrocarbon-forming organism characteristics of the Niutitang Formation from the Yangtze Block are reported for the first time,and the sedimentary environment is discussed in combination with geochemical data.Palynofacies analysis show that the Organic matter(OM)of the Niutitang Formation is mainly composed of amorphous Organic matter(AOM),with a small amount of structural Organic matter(STOM)and palynomorphs(PL).The results of CONISS(stratigraphically constrained incremental sum of squares)cluster analysis show that the PL can be divided into three zones in the ascending order:Leiosphaeridia-Micrhystridiumfungal zone,algal bloom zone and fungal development zone,corresponding to three stages:transgression,high-stand and regression,respectively.The principal component analysis(PCA)shows that the main hydrocarbon-forming organisms include planktonic green microalgae or dinoflagellates that are related to Leiosphaeridia and Microcystidium.Palynofacies analysis and geochemical data show that the Niutitang Formation was deposited under anoxic or dysoxic condition which was favorable to the enrichment of Organic matter.

关键词： Organic matter palynofacies hydrocarbon-forming organisms sedimentary environment Niutitang Formation Yangtze Block

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of natural Organic matter on thallium and silver speciation

引用

Journal of Environmental Sciences 2020年第7期32卷 185-192页

作者： Loïc A.Martin Caroline Simonucci Sétareh Rad Marc F.Benedetti Universitéde Paris Institut de physique du globe de ParisCNRSF-75005 ParisFrance IRSN PSE-ENV/SIRSE/LER-NordBP 1792262 Fontenay-aux-Roses CedexFrance Catchment and Eco-Hydrology Research Group Luxembourg Institute of Science and TechnologyL-4422 BelvauxLuxembourg BRGM Unitéde Géomicrobiologie et Monitoring Environnemental45060 Orléans Cedex 2France

Natural Organic matter(NOM)is known to play an important role in the transport and binding of trace metal elements in aquatic and soil systems.Thallium is a pollutant for which the extent of the role played by NOM is poorly known.Consequently,this study investigates thallium(Ⅰ)and its complexation to a purified humic substance as proxy for NOM.Experiments were performed with the Donnan Membrane Technique to separate,for the first time,the free Tl^+ion from its complexed form in the bulk solution.Various pH and concentrations were investigated at constant ionic strength and constant NOM proxy concentrations in solution.Experimental results were described with NICA-Donnan model.Thallium complexation was compared to silver complexation using literature data and using the same NICA-Donnan formalism.Parameters for these two cations(Tl^+and Ag^+)are reported in this article,for the first time.Results display low thallium complexation to the NOM proxy while silver competes with divalent cations for the NOM binding sites.Calculated speciation for dissolved thallium highlights the dominance of free thallium(Tl^+)in solution whereas Tl-NOM complexes contribute roughly 15%to total Tl(Ⅰ)species in river and lake type waters.Similar results are obtained for soil solutions,Tl-bound to NOM<30%of total,from UK soils with different land use and geochemistry.

关键词： Thallium Organic matter Speciation NICA-Donnan model Soil Water

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：