|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Advanced characterization of pores and fractures in coals by nuclear magnetic resonance and X-ray computed tomography显示文摘This paper demonstrates capabilities of low-field nuclear magnetic resonance (NMR) and microfocus X-ray computed tomography (μCT) in advanced, nondestructive, and quantitative characterization of pore types, producible porosity, pore structure, and spatial disposition of pore-fractures in coals. Results show that the NMR transverse relaxation time (T2) at 0.5–2.5, 20–50, and >100 ms correspond to pores of <0.1 μm, >0.1 μm, and fractures, respectively. A much higher T2 spectrum peak reflects a much better development of pores (or fractures) corresponding to the T2, and vice versa. Three basic components in coals, i.e., the pores (or fractures), coal matrix, and minerals have their distinctive range of CT numbers. Among these, the CT number of pores is commonly less than 600 HU. The producible porosity, which is a determination of permeability, can be calculated by T2 cutoff value (T2C) of coal NMR. The coal pore structure can be efficiently estimated by the newly proposed 'T2C based model'. Finally, μCT scan was proven capable of modeling and spatial visualization of pores and fractures. | YAO YanBin, LIU DaMeng, CAI YiDong & LI JunQian School of Energy Resources, China University of Geosciences, Beijing 100083, China | 2010 | Science China Earth Sciences2010，53，6： | 61 |
| 2 | Scale-Dependent Nature of Porosity and Pore Size Distribution in Lacustrine Shales: An Investigation by BIB-SEM and X-Ray CT Methods显示文摘Due to heterogeneous pore distributions within shales,petrophysical properties of shales determined by scanning electron microscopy(SEM) and X-ray computed tomography(CT) methods strongly depend on the observed domain size(analysis scale). In this paper,the influence of the analysis scale on areal and bulk porosities and pore size distribution(PSD) for lacustrine shales from the Dongying sag of Bohai Bay Basin,China were investigated using broad ion beam(BIB)-SEM and X-ray CT methods.The BIB-SEM cross-sections with high imaging resolution(10 nm/pixel) and a large field of view(>1 mm2)mainly describe the 2 D nanoscale pore system in the two shales(samples F41#-2 and Y556#-1),while CTbased 3 D reconstructions with resolutions of 0.42(F41#-1) and 0.5 μm/pixel(H172#-1) reflect the 3 D submicron pore system. The results indicate that the areal(bulk) porosity exhibits a multiple power-law distribution with increasing analysis area(volume),which can be used to extrapolate the porosity of a given area(volume). Based on SEM and CT investigations,the sizes of the minimum representative elementary areas(REAs) and volumes(REVs) were determined respectively,which are closely associated with the heterogeneousness of the pore system. Minimum REAs are proposed to be 2.93×10~4(F41#-2) and 0.91×10~4μm2(Y556#-1),and minimum REVs are 0.016(F41#-1) and 0.027 mm^3(H172#-1). As the analyzed areas(volumes) are larger than the minimum REA(REV),obtained 2 D(3 D) PSDs are comparable to each other and can be considered to reflect the shale PSD. These results provide insights into the porosity and PSD characterization of shales by SEM and X-ray CT methods. | Junqian Li Pengfei Zhang Shuangfang Lu Chen Chen Haitao Xue Siyuan Wang Wenbiao Li | 2019 | Journal of Earth Science2019，30，4： | 5 |
| 3 | Pore structure of selected Chinese coals with heating and pressurization treatments显示文摘Pore structure of Chinese coals with heating and pressurization treatments was studied using small angle X-ray scattering(SAXS),N2adsorption/desorption isotherms and scanning electron microscope(SEM).SAXS was performed for some samples after heat treatment at seven elevated temperatures from 25 to 250°C at 0 MPa and for other samples with hydrostatic pressure treatment at 0,5,10,15 and 20 MPa at the room temperature.The results show that N2adsorption isotherm together with SAXS could be a comprehensive method to evaluate the pore shape and the pore size distribution:the pore shapes are generally spherical for low rank coal and they are mainly ellipsoidal for high rank coal.All these measurements were then interpreted using the fractal theory to reveal relationship between surface fractals and coal rank,and the evolution of surface fractals under heating and pressurization treatments.The results show that surface fractal dimension(Ds)changes with different treating temperature and pressure and maximum vitrinite reflectance(Ro,m).Especially in the bituminous stage,Ds shows an increasing trend with Ro,m under varied temperatures.Moreover,Ds shows an increasing trend with increasing temperature before 200°C,and a decreasing trend after 200°C.Furthermore,the results show that Ds has a more complex relationship with Ro,m under varied treating temperature than that under varied treating pressure. | CAI YiDong LIU DaMeng PAN ZheJun YAO YanBin LI JunQian QIU YongKai | 2014 | Science China Earth Sciences2014，57，7： | 5 |
| 4 | Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance显示文摘The gas in-place(GIP)content and the ratio of adsorbed/free gas are two key parameters for the assessment of shale gas resources and have thus received extensive attention.A variety of methods have been proposed to solve these issues,however none have gained widespread acceptance.Carbon isotope fractionation during the methane transport process provides abundant information,serving as an effective method for differentiating the gas transport processes of adsorbed gas and free gas and ultimately evaluating the two key parameters.In this study,four stages of methane carbon isotope fractionation were documented during a laboratory experiment that simulated gas transport through shale.The four stages reflect different transport processes:the free gas seepage stage(Ⅰ),transition stage(Ⅱ),adsorbed gas desorption stage(Ⅲ)and concentration diffusion stage(Ⅳ).Combined with the results of decoupling experiments,the isotope fractionation characteristics donated by the single effect(seepage,adsorption-desorption and diffusion)were clearly revealed.We further propose a technique integrating the Amoco curve fit(ACF)method and carbon isotope fractionation(CIF)to determine the dynamic change in adsorbed and free gas ratios during gas production.We find that the gases produced in stage Ⅰ are primarily composed of free gas and that carbon isotope ratios of methane(δ13C1)are stable and equal to the ratios of source gas(13C 10).In stage Ⅱ,the contribution of free gas decreases,while the proportion of adsorbed gas increases,and the δ13C1 gradually becomes lighter.With the depletion of free gas,the adsorbed gas contribution in stage Ⅲ reaches 100%,and the δ13C1 becomes heavier.Finally,in stage Ⅳ,the desorbed gas remaining in the pore spaces diffuses out under the concentration difference,and the δ13C1 becomes lighter again and finally stabilizes.In addition,a kinetic model for the quantitative description of isotope fractionation during desorption and diffusion was established. | Wenbiao LI Shuangfang LU Junqian LI Pengfei ZHANG Siyuan WANG Wenjun FENG Yongbo WEI | 2020 | Science China Earth Sciences2020，63，5： | 4 |
| 5 | Effects of stress dependent electrochemical reaction on voltage hysteresis of lithium ion batteries显示文摘Intercalation of lithium ions into the electrodes of lithium ion batteries is affected by the stress of active materials, leading to energy dissipation and stress dependent voltage hysteresis. A reaction-diffusion-stress coupling model is established to investigate the stress effects under galvanostatic and potentiostatic operations. It is found from simulations that the stress hysteresis contributes to the voltage hysteresis and leads to the energy dissipation. In addition, the stress induced voltage hysteresis is small in low rate galvanostatic operations but extraordinarily significant in high rate cases. In potentiostatic operations, the stresses and stress induced overpotentials increase to a peak value very soon after the operation commences and decays all the left time. Therefore,a combined charge-discharge operation is suggested, i.e., first the galvanostatic one and then the potentiostatic one. This combined operation can not only avoid the extreme stress during operations so as to prevent electrodes from failure but also reduce the voltage hysteresis and energy dissipation due to stress effects. | Haoliang LI Yicheng SONG Bo LU Junqian ZHANG | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，10： | 3 |
| 6 | Agricultural Risk Factors Influence Microbial Ecology in Honghu Lake显示文摘Agricultural activities, including stock-farming, planting industry, and fish aquaculture,can affect the physicochemical and biological characters of freshwater lakes. However, the effects of pollution producing by agricultural activities on microbial ecosystem of lakes remain unclear.Hence, in this work, we selected Honghu Lake as a typical lake that is influenced by agriculture activities. We collected water and sediment samples from 18 sites, which span a wide range of areas from impacted and less-impacted areas. We performed a geospatial analysis on the composition of microbial communities associated with physicochemical properties and antibiotic pollution of samples. The co-occurrence networks of water and sediment were also built and analyzed. Our results showed that the microbial communities of impacted and less-impacted samples of water were largely driven by the concentrations of TN, TP, NO_3^--N, and NO_2^--N, while those of sediment were affected by the concentrations of Sed-OM and Sed-TN. Antibiotics have also played important roles in shaping these microbial communities: the concentrations of oxytetracycline and tetracycline clearly reflected the variance in taxonomic diversity and predicted functional diversity between impacted and less-impacted sites in water and sediment samples, respectively. Furthermore, for samples from both water and sediment, large differences of network topology structures between impacted and less-impacted were also observed. Our results provide compelling evidence that the microbial community can be used as a sentinel of eutrophication and antibiotics pollution risk associated with agricultural activity; and that proper monitoring of this environment is vital to maintain a sustainable environment in Honghu Lake. | Maozhen Han Melissa Dsouza Chunyu Zhou Hongjun Li Junqian Zhang Chaoyun Chen Qi Yao Chaofang Zhong Hao Zhou Jack A Gilbert Zhi Wang Kang Ning | 2019 | Genomics, Proteomics & Bioinformatics2019，17，1： | 3 |
| 7 | Pore structure and its impact on CH 4 adsorption capacity and flow capability of bituminous and subbituminous coals from Northeast China显示文摘 | Yidong Cai Dameng Liu Zhejun Pan Yanbin Yao Junqian Li Yongkai Qiu | 2013 | Fuel2013，，： | 2 |
| 8 | The Quantitative Characterization of Heterogeneity Using Nanometer CT Technique on the Shale Reservoir显示文摘1 Introduction The unconventional shale oil-gas energy,with a huge resource potential,has attracted lots of attention in the world.The occurrence、a accumulation ability and even the flow of the shale oil-gas are seriously affected by characteristics of the reservoir space.Thus,studying the characteristics of the reservoir space of the shale has been the important research direction in the field of | ZHANG Ping LI Junqian XIE Liujuan ZHANG Pengfei CHEN Jianjun | 2015 | Acta Geologica Sinica(English Edition)2015，89，A01： | 2 |
| 9 | Experimental Research on the Shale Oil Reservoirs by Nuclear Magnetic Resonance(NMR) Technique显示文摘Nanometer-scale pores exist in the shale,causing that shale has complex reservoir spaces,which results in a poor connectivity among various pores.In addition,because of the complex mineralogical compositions,there is a variety of fluid occurrence state in the pores of the shale。 | ZHANG Pengfei LU Shuangfang LI Junqian XIE Liujuan CHEN Jianjun ZHANG Ping | 2015 | Acta Geologica Sinica(English Edition)2015，89，A01： | 1 |
| 10 | A DFT study for the coadsorption of Na and NO on TiO2 (110) surface显示文摘 | Kaining Ding Junqian Li Yongfan Zhang | 2004 | Chem Phys Lett2004，，389： | 1 |
| 11 | Classification of microscopic pore-throats and the grading evaluation on shale oil reservoirs显示文摘On the basis of the characterization of microscopic pore-throats in shale oil reservoirs by high-pressure mercury intrusion technique, a grading evaluation standard of shale oil reservoirs and a lower limit for reservoir formation were established. Simultaneously, a new method for the classification of shale oil flow units based on logging data was established. A new classification scheme for shale oil reservoirs was proposed according to the inflection points and fractal features of mercury injection curves: microscopic pore-throats(less than 25 nm), small pore-throats(25-100 nm), medium pore-throats(100-1 000 nm) and big pore-throats(greater than 1 000 nm). Correspondingly, the shale reservoirs are divided into four classes, I, II, III and IV according to the number of microscopic pores they contain, and the average pore-throat radii corresponding to the dividing points are 150 nm, 70 nm and 10 nm respectively. By using the correlation between permeability and pore-throat radius, the permeability thresholds for the reservoir classification are determined at 1.00× 10^(-3) μm^2, 0.40×10^(-3) μm^2 and 0.05×10^(-3) μm^2 respectively. By using the exponential relationship between porosity and permeability of the same hydrodynamic flow unit, a new method was set up to evaluate the reservoir flow belt index and to identify shale oil flow units with logging data. The application in the Dongying sag shows that the standard proposed is suitable for grading evaluation of shale oil reservoirs. | LU Shuangfang LI Junqian ZHANG Pengfei XUE Haitao WANG Guoli ZHANG Jun LIU Huimin LI Zheng | 2018 | Petroleum Exploration and Development2018，45，3： | 1 |
| 12 | Experimental Investigations of the Mineral Wettability in Shale and its Influence Factors显示文摘Inspired by the successful development of shale oil/gas exploration in North American,multiple continental oil fields in China have vigorously put forward its evaluation and exploration of shale oil.However,the outcomes of shale oil drilling in China are not well as expected.One of the important reasons is that the fluidity of shale oil is poor,resulting in the low effectiveness of production.The | XIE Liujuan LU Shuangfang LI Junqian HU Yongjie ZHANG Pengfei CHEN Jianjun ZHANG Ping | 2015 | Acta Geologica Sinica(English Edition)2015，89，A01： | 1 |
| 13 | Geological controls on prediction of coalbed methane of No. 3 coal seam in Southern Qinshui Basin, North China显示文摘 | Yidong Cai Dameng Liu Yanbin Yao Junqian Li Yongkai Qiu | 2011 | International Journal of Coal Geology2011，，2： | 1 |
| 14 | Research progress on isotopic fractionation in the process of shale gas/coalbed methane migration显示文摘The research progress of isotopic fractionation in the process of shale gas/coalbed methane migration has been reviewed from three aspects: characteristics and influencing factors, mechanism and quantitative characterization model, and geological application. It is found that the isotopic fractionation during the complete production of shale gas/coalbed methane shows a four-stage characteristic of “stable-lighter-heavier-lighter again”, which is related to the complex gas migration modes in the pores of shale/coal. The gas migration mechanisms in shale/coal include seepage, diffusion, and adsorption/desorption. Among them, seepage driven by pressure difference does not induce isotopic fractionation, while diffusion and adsorption/desorption lead to significant isotope fractionation. The existing characterization models of isotopic fractionation include diffusion fractionation model, diffusion-adsorption/desorption coupled model, and multi-scale and multi-mechanism coupled model. Results of model calculations show that the isotopic fractionation during natural gas migration is mainly controlled by pore structure, adsorption capacity, and initial/boundary conditions of the reservoir rock. So far, the isotope fractionation model has been successfully used to evaluate critical parameters, such as gas-in-place content and ratio of adsorbed/free gas in shale/coal etc. Furthermore, it has shown promising application potential in production status identification and decline trend prediction of gas well. Future research should focus on:(1) the co-evolution of carbon and hydrogen isotopes of different components during natural gas migration,(2) the characterization of isotopic fractionation during the whole process of gas generation-expulsion-migration-accumulation-dispersion, and(3) quantitative characterization of isotopic fractionation during natural gas migration in complex pore-fracture systems and its application. | LI Wenbiao LU Shuangfang LI Junqian WEI Yongbo ZHAO Shengxian ZHANG Pengfei WANG Ziyi LI Xiao WANG Jun | 2022 | Petroleum Exploration and Development2022，49，5： | 1 |
| 15 | Evaluation and modeling of gas permeability changes in anthracite coals显示文摘 | Li Junqian Liu Dameng Yao Yanbin | 2013 | Fuel2013，111，： | 1 |
| 16 | Analysis of diffusion induced elastoplastic bending of bilayer lithium-ion battery electrodes显示文摘Bilayer electrode, composed of a current collector layer and an active material layer, has great potential in applications of in-situ electrochemical experiments due to the bending upon lithiation. This paper establishes an elastoplastic theory for the lithiation induced deformation of bilayer electrode with consideration of the plastic yield of current collector. It is found that the plastic yield of current collector reduces the restriction of current collector to an active layer, and therefore, enhances in-plane stretching while lowers down the rate of electrode bending. Key parameters that influence the elastoplastic deformation are identified. It is found that the smaller thickness ratio and lower elastic modulus ratio of current collector to an active layer would lead to an earlier plastic yield of the current collector, the larger in-plane strain, and the smaller bending curvature, due to balance between the current collector and the active layer. The smaller yield stress and plastic modulus of current collector have similar impacts on the electrode deformation. | Dawei LI Zongzan LI Yicheng SONG Junqian ZHANG | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，5： | 0 |
| 17 | New advances in unconventional resources:accumulation and production--introduction to the special issue显示文摘1 Introduction The recovery and utilization of unconventional resources over the last decade-and-a-half,especially shale oil and gas,has developed and continues to play a decisive role in worldwide energy supply and markets(Bustin,2012;Zou et al.,2010 and 2019).Ongoing and expandi ng production from uncon ven tional resources counters burgeoni ng dema nd and has exerted an increasi ng impact on petroleum prices and global en ergy structure.This,albeit short,history of unconventional oil and gas production provides a rich set of'lessons learned',with further progress expected to catalyze the developme nt of new tech no logies.However,as fossil fuels,unconventional hydrocarb ons also face pressure from the expa nsion and diversificati on of ren ewable and alternative energy resources. | Yong LI Junqian LI Derek ELSWORTH | 2021 | Frontiers of Earth Science2021，15，2： | 0 |
| 18 | Synthesis and photoluminescence of Ca1-xTiO3 :xEu^3+ nanoparticles显示文摘Ca_(1-x)TiO_3:xEu^(3+) nanoparticles(NPs) with the size ranging from 27 nm to 135 nm were prepared by means of a chemical co-precipitation method. The structural and optical properties of the NPs were investigated,and the influence of Eu doping content and sintering temperature on the photoluminescence of the Ca_(1-x)TiO_3:xEu^(3+) NPs were examined. An obvious red emission band centered at 615 nm were observed under the excitation with 395 nm for the Ca_(1-x)TiO_3:xEu^(3+)NPs. X-ray photoelectron spectroscopy analyses suggest that Eu^(3+) is incorporated into not only the Ca-site, but also Ti-site of Ca TiO_3 crystal lattice. Our study shows the promise of the Ca_(1-x)TiO_3:xEu^(3+) NPs as a red nanophosphor. | Shang Zhou Hua Wang Li Zhong Junqian Zhao Liang Li Guanghai Li | 2018 | Journal of Materials Science & Technology2018，34，6： | 0 |
| 19 | Intelligent Identification over Power Big Data:Opportunities,Solutions,and Challenges显示文摘The emergence of power dispatching automation systems has greatly improved the efficiency of power industry operations and promoted the rapid development of the power industry.However,with the convergence and increase in power data flow,the data dispatching network and the main station dispatching automation system have encountered substantial pressure.Therefore,themethod of online data resolution and rapid problemidentification of dispatching automation systems has been widely investigated.In this paper,we performa comprehensive review of automated dispatching of massive dispatching data from the perspective of intelligent identification,discuss unresolved research issues and outline future directions in this area.In particular,we divide intelligent identification over power big data into data acquisition and storage processes,anomaly detection and fault discrimination processes,and fault tracing for dispatching operations during communication.A detailed survey of the solutions to the challenges in intelligent identification over power big data is then presented.Moreover,opportunities and future directions are outlined. | Liang Luo Xingmei Li Kaijiang Yang Mengyang Wei Jiong Chen Junqian Yang Liang Yao | 2023 | Computer Modeling in Engineering & Sciences2023，，3： | 0 |
| 20 | Desorption Behavior of Coalbed Gas and its Anisotropy Within High Rank Coal Reservoir in the Zhengzhuang Block of the Southern Qinshui Basin,China显示文摘1 Introduction With the exploration and development of coalbed methane(CBM),there has been a growing interest in the coalbed gas desorption behavior and its geological controls.To date,two primary species including the desorption rate and desorption velocity of the coalbed gas have been studied widely(e.g.Pollard and Aydin,1998;Chen et al.,2008;Liu et al.,2012).Some evidences | LI Junqian LU Shuangfang ZHANG Pengfei ZHANG Ping CHEN Jianjun | 2015 | Acta Geologica Sinica(English Edition)2015，89，A01： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员