检索结果-南通市图书馆

Petrogenesis of Early Cretaceous Pandian high-Mg diorites from the eastern North China Craton within an intracontinental setting:Implications for the skarn Fe mineralization

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Si-Yuan Li Chao Fu Qi-Wei Feng Xiao-Bo Zhao Zhi-Cai Dang Kang-Kang Xu Ming-Bo Gao Ji-Lei Gao Zhuang Duan Ming Ma Tianjin center China Geological Survey (North China Center for Geoscience Innovation) Shandong Engineering Research center of High-Grade Iron Deposits {1. and Exploitation China University of Geosciences (Beijing) No.1.Institute of Geology and Mineral Resources of Shandong Province Geological exploration Institute of Shandong Zhengyuan China Metallurgical Geology Bureau Shandong Provincial Bureau of Geology & Mineral Resources Institute of geophysical and Geochemical {1. Chinese Academy of Geological Sciences

High-magnesium andesitic rocks （HMAs） were initially interpreted to have formed via interaction of slab melt with mantle in arc ***,high-magnesium diorites （HMDs,analogs of HMAs）have been recognized can be formed in intracontinental *** of the HMDs producedsignificant Fe skarn *** genesis of HMDs and how they earn high Fe mineralization fertilities remain *** Pandian HMDs,located in Luxi Block,eastern North China Craton（NCC）,formed in continental interior and show a close spatiotemporal and genetic relationship to Fe skarn *** contribution carried out a comprehensive geochemical study on the Pandian HMDs to constrain the genesis of HMDs and further shed light on the key factors leading to their high Feskarn mineralization *** rocks show high Mg#values （55–80）,andesitic compositions （SiO2:55.3–66.2 wt%）,and arc-like *** Pandian HMDs possess (87Sr/86Sr)iof0.70720–0.70737,εNd（t） values of-1..8–-1..6,(206Pb/204Pb)iof 1..3706–1..4575,(207Pb/204Pb)iof1..3945–1..4440,and (208Pb/204Pb)iof 36.6606–*** notably distinct geochemicalcharacteristics between the Pandian HMDs and ancient lower crust in the NCC make it unlikely that the Pandian HMDs were sourced from the ***,The chemical characteristics of Pandian HMDs are akin to the proximal and contemporaneous mantle-derived Ji’nan *** presentresults,combined with geological analysis,reveal that Pandian HMDs were most likely primarily derived from an ancient sub-continental lithospheric mantle （SCLM） experienced metasomatism related to the subducted Paleo-Pacific slab-released *** higher La/Sm and Hf/Sm ratios and more enriched radiogenic Sr-Pb isotopes of Pandian HMDs relative to Ji’nan gabbro indicate crustalmaterial involvement during magma *** of crustal material assimilation,based on Sr-Nd isotopes,suggests parental melts of the Pandian HMDs assimilated about 20%Archean TTG gneisses and 60%Ordovicia

关键词：

A seismic elastic moduli module for the measurements of low-frequency wave dispersion and attenuation of fluid-saturated rocks under different pressures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 162-181页

作者： Yan-Xiao He Shang-Xu Wang Gen-Yang Tang Chao Sun Hong-Bing Li San-Yi Yuan Xian Wei Li-Deng Gan Xiao-Feng Dai Qiang Ge Peng-Peng Wei Hui-Qing Zhang National Key Laboratory of Petroleum Resources and Engineering CNPC Key Lab of Geophysical ExplorationCollege of GeophysicsChina University of Petroleum(Beijing)Beijing102249China School of Resources and Geosciences China University of Mining and TechnologyXuzhou221116JiangsuChina Research Institute of Petroleum exploration and Development CNPCBeijing100083China Beijing Vocational College of Labour and Social Security Beijing100029China PetroChina Dagang Oilfield exploration and Development Research Institute CNPCTianjin300280China

Knowledge about the seismic elastic modulus dispersion,and associated attenuation,in fluid-saturated rocks is essential for better interpretation of seismic observations taken as part of hydrocarbon identification and time-lapse seismic surveillance of both conventional and unconventional reservoir and overburden performances.A Seismic Elastic Moduli Module has been developed,based on the forced-oscillations method,to experimentally investigate the frequency dependence of Young's modulus and Poisson's ratio,as well as the inferred attenuation,of cylindrical samples under different confining pressure *** with three standard samples showed that the measured elastic moduli were consistent with the published data,indicating that the new apparatus can operate reliably over a wide frequency range of f∈[1.2000,1.^(6)]*** Young's modulus and Poisson's ratio of the shale and the tight sandstone samples were measured under axial stress oscillations to assess the frequency-and pressure-dependent *** dry condition,both samples appear to be nearly frequency independent,with weak pressure dependence for the shale and significant pressure dependence for the *** particular,it was found that the tight sandstone with complex pore microstructure exhibited apparent dispersion and attenuation under brine or glycerin saturation conditions,the levels of which were strongly influenced by the increased effective *** addition,the measured Young's moduli results were compared with the theoretical predictions from a scaled poroelastic model with a reasonably good agreement,revealing that the combined fluid flow mechanisms at both mesoscopic and microscopic scales possibly responsible for the measured dispersion.

关键词： Low-frequency measurements Dispersion and attenuation Rock physics Fluid flow

Characteristics of the Deep Crustal Structure of the Greenland–Iceland–Faroe Ridge in the North Atlantic

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2024年第S1期 87-89页

作者： ZHANG Chunguan LI Fengyuan ZHANG Qiang ZHANG Guoli HU Hongchuan YIN Rui School of Earth Sciences and Engineering Xi'an Shiyou University Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou University Institute of geophysical and Geochemical {1. CAGS Tianjin center China Geological Survey

The Greenland–Iceland–Faroe Ridge, located between the central eastern part of Greenland and the northwestern edge of Europe, spans across the North Atlantic. As the core component of the Greenland–Iceland–Faroe Ridge, the Iceland is an alkaline basalt area, which belongs to the periodic submarine magmatism and submarine volcano eruption resulting from mantle plume upwelling(Jiang et al., 2020). For the oceanic plateaus, the characteristics of the Iceland are closest to the continental crust, so the Iceland is considered the most suitable for simulating the earliest continental crust on the Earth(Reimink et al., 201.).

关键词：

Multi-path navigation method using solar panel-reflected solar oscillations for Earth satellites

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第7期67卷 327-328页

作者： Yuqing YANG Haonan YANG Xiaolin NING Weiren WU Jiancheng FANG School of Instrument Science & Opto-electronics Engineering Beihang University Lunar exploration and Space Program {1. China National Space Administration

Several autonomous navigation methods have been studied to reduce reliance on the ground stations. Geomagnetic navigation, gravity gradient navigation, and celestial navigation using optical sensors are typical autonomous navigation methods. Geomagnetic and gravity gradient navigation have low navigation accuracy (1.01.m [1. and 235 m [2], respectively) due to the poor accuracy of the geomagnetic and gravity gradient maps.

关键词： Solar panels

High-probability ground motion simulation in Maduo County for the Maduo M7.4 earthquake in 2021. A possible supershear earthquake

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Zongchao Li Zhiwei Ji Jize Sun Hiroe Miyake Yanna Zhao Hongjun Si Mengtan Gao Yi Ding Institute of Geophysics， China Earthquake Administration Institute of Earthquake Forecasting， China Earthquake Administration Shenzhen Academy of Disaster Prevention and Reduction Earthquake Research Institute， The University of Tokyo geophysical {1. center， China Earthquake Administration Beijing University of Technology

On May 22， 2021. an Ms7.4 earthquake occurred in Maduo County， Qinghai Province， on the western plateau of China. The level of seismic monitoring in this area was inadequate， and incomplete seismic waveforms were obtained from a few broadband seismometers located within 300 km of the epicentre. All waveforms showed "truncation" phenomena. The waveforms of earthquakes can guide ground motion inputs in near-fault areas. This paper uses the empirical Green's function method to consider the uncertainties in source parameters and source rupture processes by synthesizing high-probability， accurate waveforms in Maduo County （MAD station） near the epicentre. The acceleration waveform at the DAW strong-motion station， located 1.6 km from the epicentre， is first synthesized with the observed waveform of the mainshock. This critical step not only provides a more accurate source and rupture model of the Maduo earthquake but also establishes an essential reference standard. Secondly， the inferred models are rigorously applied to synthesize the acceleration waveform of the MAD station， ensuring that the results maintain a high accuracy and probability. The findings suggest that （1. the simulated acceleration waveform for the MAD station can better characterize the actual ground motion characteristics of the Ms7.4 earthquake in Maduo County， with high accuracy and probability in peak ground acceleration （Abbreviated as PGA） ranges of 1.0–240 cm/s2and 350–390 cm/s2， respectively， and （2） the Ms7.4 earthquake did not undergo a complete supershear rupture process. The first asperity located on the east side of the epicentre is most likely to undergo supershear rupture. However， the Maduo earthquake may have been a complete subshear rupture. （3） The fault dislocation model of the three-asperity model better matches the actual source rupture process of the Maduo earthquake. This method can provide relatively accurate acceleration waveforms for regions with limited earthquake monitoring

关键词：

Contamination assessment,source apportionment and associated health risks of PTEs in agricultural soil under five land-use patterns in Sanya,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Geology 2024年第3期7卷 469-479页

作者： Jian-zhou Yang Yan-gang Fu Qiu-li Gong Sheng-ming Ma Jing-jing Gong Jian-weng Gao Zhen-liang Wang Yong-wen Cai Shi-xin Tang Institute of geophysical and Geochemical {1. Chinese Academy of Geological SciencesChina Geological SurveyLangfang 065000China Key Laboratory of Coupling Process and Effect of Natural Resources Elements Ministry of Natural ResourcesBeijing 100055China

To understand the levels of potentially toxic elements(PTEs)contamination in soils and their effects on human health from different agricultural land use in Sanya,China.1.8 soil samples(64 topsoil samples and corresponding subsoil samples)were collected from the five representative land-use *** coupled plasma mass spectrometry(ICP-MS),Atomic fluorescence spectrometry(AFS),and Inductively coupled plasma optical emission spectrometry(ICP-OES)were used to determine the content of PTEs(As,Cd,Hg,Cu,Cr,Ni,Pb,Zn,Co,Mo,Sb,and V).Correlation analysis and factor analysis were used to determine the source of ***-accumulation index(I_(geo)),hazard quotient(HQ),and total carcinogenic risk index(TR)were used to measure the PTEs contamination and its relative health *** showed that the average values of 1. PTEs in topsoil were higher than the Hainan soil geochemical baseline,showing different degrees of PTEs accumulation *** concentration of PTEs in the topsoil was lower than those in the subsoil except for Cd and *** I_(geo)revealed that the major accumulated element in soils was As followed by *** apportionment suggested that parent materials and agricultural practices were the dominant factors for PTEs accumulation in the *** risks of soil samples from five land-use patterns presented a trend of paddy field>dry field>woodland>orchard>garden ***,the HQ values of 1. PTEs were less than the recommended limit of HQ=1.representing that there are no non-carcinogenic risks of PTEs for children and adults in the study *** TR values are within 6.95×1.^(-6)-1.38×1.^(-5),which corresponds to the low *** the PTEs in the agricultural soil of the study area show little influence on the health status of the local population.

关键词： Potentially toxic trace elements(PTEs) Soils Land-use Geo-accumulation index(Igeo) Hazard quotient(HQ) Total carcinogenic risk index(TR) Source apportionment Health risk Agricutural geological survey engineering

Experimental analysis of matrix moveable oil saturation in tight sandstone reservoirs of the south Ordos Basin,China

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2024年第1期5卷 184-195页

作者： Ting Xu Jun Pu Xuejie Qin Yi Wei Science and Technology Development Department Petroleum Exploration&Production Research InstituteSINOPECBeijing100083China center Research Department of North China Petroleum {1.&Production Research Institute SINOPECBeijing100083China Oil Field Development Department Petroleum Exploration&Production Research InstituteSINOPECBeijing100083China

Tight oil reservoirs in the south Ordos Basin are characterized by fractured,heterogeneous oil-bearing strata(an oil saturation of less than 55%on average),normal pressure(0.8±)and extra-low permeability(less than 0.3 mD).In the Chang 8 tight sandstone reservoir in Honghe oilfield,micro-and nanopores,especially those with a pore-throat radius of less than 1.mm,account for more than 90%.Fluid flow in the matrix is non-linear and crude oil flow rates are very low under normal pressure *** improved understanding of oil mobility in a tight matrix is key to further development of normalpressure tight-oil resources in the continental *** this study,constant-velocity and high-pressure mercury injection experiments were conducted using samples of typical tight sandstone cores obtained from the south of Ordos Basin.A new method for reconstructing the full-scale pore-throat distribution characteristics of tight sandstone reservoirs was established successfully,based on which multistage centrifugal tests,tests of low-pressure differential displacement of oil by water,and nuclear magnetic resonance tests were conducted in order to obtain the distribution characteristics of moveable fluid in different *** moveable oil saturation(MOS)and degree of oil recovery(*** of accumulative oil production to producing geologic reserves)of the core samples under different differential pressures for displacement were *** for the tight oil reservoirs in the south Ordos Basin,the moveable fluids are mainly stored in sub-micron(0.1.-0.5 mm)*** Type I reservoirs(k>0.1.mD),the volume percentage of moveable fluid in pores with a radius larger than 0.5 mm is relatively high(greater than 40%).The degree of oil recovery of water flooding serves as the basis for forecasting recoverable reserves for tight oil *** reserves under water flooding,mainly occur in pores with a radius greater than 0.5 *** contribution of Type I reserves to oil pro

关键词： Tight reservoir Pore-throat structure Moveable fluid volume Moveable oil saturation(MOS) Waterflooding oil recovery South Ordos basin

The Geology, Fluid Inclusions, and O-S Isotopes of the Mibei Gold Deposit, Hunan Province, Southern China

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

Acta Geologica Sinica(English Edition) 2024年第4期98卷 992-1006页

作者： XUE Wenhao LIANG Yayun LI Xiaofeng LI Mingyi XIE Wenbo PENG Xue XIA Rui HE Hongsheng XIAO Jincheng School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China geophysical and Geochemical Survey Institute of Hunan Changsha 410116China New Geological Energy exploration and Development Engineering Technology Research {1. of Hunan Changsha 410116China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences(Beijing)Beijing 100083China Comprehensive Survey Command center for Natural Resources China Geological SurveyBeijing 100055China

The Mibei gold deposit,located in the southwestern part of the Xuefengshan uplift zone,the middle section of the Jiangnan orogenic belt in southern China,has estimated gold resources of approximately seven *** deposit is primarily a quartz vein-type gold deposit,with ore bodies occurring mainly within Neoproterozoic *** main metallic minerals in the ore are pyrite,chalcopyrite,and *** this study,the petrography and microthermometry of ore-forming fluid inclusions,oxygen isotopes of gold-bearing quartz,and sulfur isotopes of goldbearing sulfides and arsenopyrite were *** types of fluid inclusions were identified:type Ⅰa three-phase inclusions comprising vapor and two phases of liquids(V_(CO_(2))+L_(CO_(2))+L_(H2O)),type Ⅰb two-phase liquids(L_(CO_(2))+L_(H2O)),typeⅡ two-phase vapor-rich inclusions(V/V+L> 50%),and type Ⅲ pure liquid *** Ⅰ inclusions were heated uniformly to the liquid phase,type Ⅱ inclusions were heated uniformly to the gas phase,and type Ⅲ inclusions were heated without *** general,the temperature range of homogenization to liquid phase of fluid inclusions in the Mibei gold deposit is 204-227℃.The salinity of the inclusion ranges from 4.6 to 1..2 wt% NaCl *** δ~(1.)O_(SMOW) of gold-bearing quartz varies from 1..9‰ to 1..5‰.The δ~(1.)O_(H2O) of gold-bearing quartz are varied from 6.5‰ to 7.5‰.The δ~(34)S values of gold-bearing pyrite range from 1.7‰ to 6.8‰.The δ~(34)S values of gold-bearing arsenopy rite range from 5.6%o to 5.9‰.Theδ~(34)S values of pyrite from wall rocks slate range from 6.4‰ to 1..6‰.This evidence implies that the ore-forming fluids of the Mibei gold deposit originated from magmatic-hydrothermal processes,mixing with minor S from the surrounding *** with the evolution of the Jiangnan orogenic belt,due to the magmatic and tectonic activities of the Xuefengshan uplift during the Caledonian period,the fault seal mechanism controlled the ore-forming p

关键词： ore-forming fluid ore genesis Mibei gold deposit Xuefengshan uplift zone Jiangnan orogenic belt

Full waveform inversion based on hybrid gradient

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 1660-1670页

作者： Chuang Xie Zhi-Liang Qin Jian-Hua Wang Peng Song Heng-Guang Shen Sheng-Qi Yu Ben-Jun Ma Xue-Qin Liu Qingdao Innovation and Development Base Harbin Engineering UniversityQingdao266000ShandongChina Qingdao Innovation and Development center Harbin Engineering UniversityQingdao266000ShandongChina CNOOC Research Institute Co. Ltd.Beijing100028China College of Marine Geoscience Ocean University of ChinaQingdao266100ShandongChina Weihai Sunfull geophysical {1. Equipment Co. Ltd.Weihai264209ShandongChina

The low-wavenumber components in the gradient of full waveform inversion(FWI)play a vital role in the stability of the ***,when FWI is implemented in some high frequencies and current models are not far away from the real velocity model,an excessive number of low-wavenumber components in the gradient will also reduce the convergence rate and inversion *** solve this problem,this paper firstly derives a formula of scattering angle weighted gradient in FWI,then proposes a hybrid *** hybrid gradient combines the conventional gradient of FWI with the scattering angle weighted gradient in each inversion frequency band based on an empirical formula derived *** weighted hybrid mode,we can retain some low-wavenumber components in the initial lowfrequency inversion to ensure the stability of the inversion,and use more high-wavenumber components in the high-frequency inversion to improve the convergence *** results of synthetic data experiment demonstrate that compared to the conventional FWI,the FWI based on the proposed hybrid gradient can effectively reduce the low-wavenumber components in the gradient under the premise of ensuring inversion *** also greatly enhances the convergence rate and inversion accuracy,especially in the deep part of the *** the field marine seismic data experiment also illustrates that the FWI based on hybrid gradient(HGFWI)has good stability and adaptability.

关键词： Full waveform inversion Hybrid gradient Scattering angle weighted Low-wavenumber component