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Diagenetic evolution and effects on reservoir development of the Dengying and Longwangmiao formations,Central Sichuan Basin,Southwestern China

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Petroleum Science 2023年第6期20卷 3379-3393页

作者： Lei Jiang An-Ping Hu Yong-Liang Ou Da-Wei Liu Yong-Jie Hu You-Jun Tang Peng Sun Yuan-Yuan Liu Zi-Chen Wang chun-fang cai Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China College of Resources and Environment Yangtze UniversityWuhanHubei430100China PetroChina Hangzhou Research Institute of Geology HangzhouZhejiang310023China Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Sinopec International Petroleum Exploration and Production Corporation Beijing100029China Institute of Sedimentary Geology Chengdu University of TechnologyChengduSichuan610059China

The deeply buried Lower Cambrian Longwangmiao Formation and Upper Ediacaran Dengying Formation from the Sichuan Basin,China,have a total natural gas reserve up to 3×10^(12)m^(3).The complex diagenetic evolution and their impacts on the present-day reservoir quality have not been systematically elucidated,hampering the current ***,the integration and comparation diagenetic study on these two formations,which may be able to shed new lights on reservoir formation mechanism,are yet to be systemically *** compiling geochemistry data,including carbonate U-Pb ages and petrophysics data,coupled with new petrology,trace elements,and strontium isotope data,of various types of diagenetic carbonates,this study aims to decipher the potential links between diagenesis and reservoir development of both ***,similar diagenetic sequence,which contains five distinctive dolomite phases,is established in both *** matrix dolomite(D1)and early dolomite cement(D2)were likely formed by reflux dolomitization,as inferred by their nearly syn-depositional U-Pb ages and elevatedδ^(18)O caused by seawater *** subsequent moderate burial dolomite cement(D3)was most plausibly the product of burial compaction as indicated by its lighterδ^(18)O and slightly younger U-Pb ages compared with D1 and *** deep burial dolomite cements(D4 and D5)yield markedly depletedδ^(18)O,elevated ^(87)Sr/^(86)Sr,along with much younger U-Pb ages and higher precipitation temperatures,suggesting that they were likely linked to hydrothermal *** the wide occurrence of meteoric and organic acids leaching and thermochemical sulfate reduction,they may have only played a subsidiary role on these reservoirs ***,superior reservoir quality is tightly linked to tectonics as inferred by higher reservoir quality closely related to the well-developed fractures and faults filled with abundant hydrothermal ***,good reservoi

关键词： Carbonate reservoir Diagenesis Dolomitization Meteoric water Oil charge Hydrothermal fluids Tectonic-driven fractures Deep to ultra-deep exploration

Thermochemical sulfate reduction and fluid evolution of the Lower Triassic Feixianguan Formation sour gas reservoirs,northeast Sichuan Basin,China

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Thermochemical sulfate reduction and fluid evolution of the ...

Aligning enhanced feature representation for generalized zero-shot learning

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Lei Jiang Richard H.Worden chun fang cai Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth and Ocean Sciences School of Environmental SciencesLiverpool University

The dolomite-hosted,Lower Triassic Feixianguan Formation from the northeast Sichuan Basin,China,is an economically important reservoir that contains sour natural *** reservoirs were initially filled with oil,later replaced by gas during burial to 7000 m(22,965 ft) followed by uplift to about 4000 m(13,123 ft).We have studied the souring process(thermochemical sulfate reduction[TSR]) and diagenetic evolution of the Feixianguan Formation using detailed petrology,fluid-inclusion studies,and stable-isotope data from carbonate *** diagenesis included(in time order) the eodiagenetic main stage of dolomitization by a reflux mechanism;fracture-related calcite cementation;barite,quartz,celestite,and fluorite mineralization;and a dolomite recrystallization *** sulfate reduction resulted in anhydrite replacement by calcite,petroleum destruction,formation of sulfur-rich pyrobitumen and elemental sulfur,and generation of large volumes of HS and *** during TSR can be subdivided into oil-stage TSR and gas-stage TSR,with oil-stage TSR defined by the presence of primary oil and bitumen inclusions in the TSR *** on aqueous inclusion homogenization temperatures,oilstage TSR commenced at a temperature of 116℃,with a mode between 130℃ and 140℃.Gas-stage TSR started at a temperature of 135℃ and continued to maximum burial temperatures of about 220℃.Trace amounts of pyrite,barite,quartz,and celestite grew during ***-TSR diagenesis was dominated by fracture-related calcite precipitation as well as celestite and anhydrite *** water salinity increased from depositional values(3.5 wt.%) up to 24 wt.%during pre-TSR dolomite recrystallization probably because of an influx of evaporite-associated water from the overlying Jialingjiang Formation,although pre-TSR barite,quartz,celestite,and fluorite mineralization was associated with a transient decrease in water *** TSR,formation water salinity decreased

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Science China(Information Sciences) 2025年

作者： Zhiyu fang Xiaobin ZHU chun YANG Hongyang ZHOU Jingyan QIN Xucheng YIN School of Computer&Communication Engineering University of Science and Technology Beijing

Abstract Constructing an effective common latent embedding by aligning the latent spaces of cross-modal variational autoencoders （VAEs） is a popular strategy for generalized zero-shot learning （GZSL）.However,due to the lack of fine-grained instance-wise annotations,existing VAE methods can easily suffer from the posterior collapse *** this paper,we propose an innovative asymmetric VAE network by aligning enhanced feature representation （AEFR） for *** from general VAE structures,we designed two asymmetric encoders for visual and semantic observations and one decoder for visual ***,we propose a simple yet effective gated attention mechanism （GAM） in the visual encoder for enhancing the information interaction between observations and latent variables,alleviating the possible posterior collapse problem *** addition,we propose a novel distributional decoupling-based contrastive learning （D2-CL） to guide learning classification-relevant information while aligning the representations at the taxonomy level in the latent representation *** experiments on publicly available datasets demonstrate the state-of-the-art performance of our *** source code is available at https://***/seeyourmind/AEFR.

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Single-cell transcriptomic profiling reveals ZEB1-mediated regulation in microglial subtypes and the impact of exercise on neuroinflammatory responses

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Traditional Medicine Research 2025年第2期10卷 55-64页

作者： Jin-fang Wu Yi-Sheng Chen Yu-chun Xie Department of Rehabilitation Medicine Jiangsu Province Geriatric HospitalNanjing 210024China Fujian Key Laboratory of Toxicant and Drug Toxicology Medical CollegeNingde Normal UniversityNingde 352100China Central Laboratory Jiangsu Province Geriatric HospitalNanjing 210024China

Background:This study aims to identify distinct cellular subtypes within brain tissue using single-cell transcriptomic analysis,focusing on specific biomarkers that differentiate cell types and the effects of traditional and exercise ***:Four samples were analyzed:older control(OC),older exercise(OE),younger control(YC),and younger exercise(YE).Single-cell RNA sequencing was used to distinguish cellular subtypes through their biomarker *** visualization included violin and t-SNE plots to illustrate biomarker expression across cell clusters such as oligodendrocytes,microglia,and ***,BV2 cells were exposed to amyloid-beta fragments to simulate Alzheimer’s disease,assessing the impact of exercise-induced cellular ***:Distinct cellular subtypes were identified:oligodendrocytes(MBP,St18),microglia(Dock8),and astrocytes(Aqp4,Gpc5).Sample OE was predominantly oligodendrocytes,while YE had more astrocytes,inhibitory neurons,and Canal-Retzius *** showed a significant presence of Olfm3+ganglion ***1 gene knockout revealed changes in SMAD family gene expression,which regulate *** stress levels were also ***:This profiling enhances our understanding of brain cellular functions and interactions,potentially informing targeted therapies in neurological *** may influence brain cell immune responses and cell death pathways by regulating specific gene expressions,offering new insights for treating neuroinflammation and degeneration.

关键词： single-cell transcriptomics brain tissue cellular subtypes biomarker expression neuronal diversity

Recent advances in synthesis of organosilicons via radical strategies

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Chinese Chemical Letters 2021年第4期32卷 1280-1292页

作者： Xueping Zhang Jingkun fang chun cai Guoping Lu School of Chemical Engineering Nanjing University of ScienceTechnologyNanjing 210094China

Organosilicon compounds play an important role in the fields of materials science,pharmacy,and organic *** development of effective approaches for the preparation of these compounds have also become a research focus in organic *** recent years,free radical synthesis of organosilicons has been vigorously developed,which generally has the advantages of milder synthesis conditions,higher yields and selectivity,and free of precious metal catalysts compared with traditional *** article reviews research progresses in the synthesis of organosilico n compounds by free radical pathways since *** most cases,the radical silylation is achieved based on the reaction of silyl radicals,which are triggered by four routes including peroxide,transition-metal-induced peroxide decomposition,alkali,*** alkyl radicals can also initiate the radical silylation for the generation of C(sp^(3))—Si bonds.

关键词： Organosilicon Radical silylation Single electron transfer Hydrogen atom transfer Photoredox Alkyl radical

The extended auxiliary the KdV equation with equation method for variable coefficients

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Chinese Physics B 2011年第10期20卷 166-170页

作者： Shi Lan-fang Chen cai-Sheng Zhou Xian-chun College of Mathematics Hohai University Nanjing 210098 China College of Mathematics and Physics Nanjing University of Information Science and Technology Nanjing 210044 China College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing 210044 Chins

This paper applies an extended auxiliary equation method to obtain exact solutions of the KdV equation with variable coefficients. As a result, solitary wave solutions, trigonometric function solutions, rational function solutions, Jacobi elliptic doubly periodic wave solutions, and nonsymmetrical kink solution are obtained. It is shown that the extended auxiliary equation method, with the help of a computer symbolic computation system, is reliable and effective in finding exact solutions of variable coefficient nonlinear evolution equations in mathematical physics.

关键词： extended auxiliary equation method KdV equation with variable coefficients exactsolutions

Iodine catalyzed synthesis of the chromene derivatives in one-pot

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Chinese Chemical Letters 2012年第12期23卷 1347-1351页

作者： Li Yan Zeng Mei fang Lv chun cai Chemical Engineering College Nanjing University of Science & Technology

Iodine catalyzed one-pot reactions of salicylaldehyde and dimolecular 1H-indene-l,3（2H）-dione, barbituric acids, 4-hydro- xycoumarin, or 4-hydroxy-6-methylpyran-2-one were performed and provided a rapid, convenient and general approach to synthesize the chromene derivatives. 2-（11-Oxo-10,11-dihydroindeno[1,2-b]chromen-10-yl）-lH-indene-1,3（2H）-diones P1-P4 and 10-（4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl）-3-methylpyrano[4,3-b]chromen-1（1OH）-ones P8-P9 were unprecedentedly prepared and structurally identified by NMR and Mass. The confirmation of structure by single crystal X-ray crystallography is reported for P3.

关键词： Chromene Iodine MCRs Salicylaldehyde 1H-Indene-1,3(2H)-dion

Investigation of open channel flow with unsubmerged rigid vegetation by the lattice Boltzmann method

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Journal of Hydrodynamics 2020年第4期32卷 771-783页

作者： He-fang Jing Yin-juan cai Wei-hong Wang Yakun Guo chun-guang Li Yu-chuan Bai State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China Key Laboratory of Intelligent Information and Big Data Processing of Ningxia Province Yinchuan 750021China School of Civil Engineering North Minzu UniversityYinchuan 750021China Faculty of Engineering and Informatics University of BradfordBradfordUK

The aquatic vegetation can significantly affect the flow structure,the sediment transport,the bed scour and the water quality in rivers,lakes,reservoirs and open *** this study,the lattice Boltzmann method(LBM)is applied in the two-dimensional numerical simulation of the flow structure in a flume with rigid vegetation.A multi-relaxation time model is applied to improve the stability of the numerical scheme for flows with a high Reynolds *** vegetation induced drag force is added in the lattice Boltzmann equation model in order to improve the simulation accuracy and an algorithm of the multi-relaxation time is *** simulations are performed for a wide range of flow and vegetation conditions and are validated by comparing with the laboratory *** of the simulated and experimentally measured flow Helds shows that the numerical simulation can satisfactorily reproduce the laboratory experiments,indicating that the proposed lattice Boltzmann model enjoys a high accuracy for simulating the flow-vegetation interaction in open channels.

关键词： Lattice Boltzmann method(LBM) multi-relaxation time model aquatic vegetation drag force open channel flow

AF-Embedding of Crossed Products of Certain Graph C＊-algebras by Quasi-free Actions （II）

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Acta Mathematica Sinica,English Series 2011年第8期27卷 1581-1590页

作者： Xiao chun fang Department of Mathematics Tongji University Shanghai 200092 P. R. China

Let E be a row-finite directed graph, let G be a locally compact abelian group with dual group G = F, let w be a labeling map from E＊ to F, and let （C＊（E）, G,a^w） be the C＊-dynamical system defined by w. Some mappings concerning the AF-embedding construction of C＊（E） X（aw） G are studied in more detail. Several necessary conditions of AF-embedding and some properties of almost proper labeling map are obtained. Moreover it is proved that if E is constructed by attaching some l-loops to a directed graph T consisting of some rooted directed trees and G is compact, then oJ is k almost proper, that is a sufficient condition for AF-embedding, if and only if ∑j^Kk=1^wγ j ≠fi 1r for any loop γi, γ2 …γk attached to one path in T

关键词： AF-embedding crossed products graph C*-algebras