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| 1 | Tectonic implications of Late Paleozoic stratigraphic distribution in Northeast China and adjacent region显示文摘An analysis of the distribution of the Late Paleozoic strata on Northeast China and adjacent region reveals a zonal pattern of the distribution around the core of the Jiamusi-Mongolia Block.The main part of Late Paleozoic marine strata in this area is considered the continental margin deposits of the Jia-musi-Mongolia Block by analyzing the stratigraphic contact relationship,lithofacies,etc.The results are exhibited in a series of tectonic paleogeographic maps.This presents an important proof for the foundation of the Jiamusi-Mongolia Block,and confines the forming time of Jiamusi-Mongolia Block to the Late Silurian. | ChengWen Wang YueWu Sun Ning Li GuoWei Zhao XiaoQin Ma | 2009 | Science China Earth Sciences2009，52，5： | 36 |
| 2 | A Spore-Pollen Assemblage from the Damoguaihe Formation in the Tamutsag Basin, Mongolia and Its Geological Implication显示文摘Based on the palynological data from Well Ta-19-36 and Well Ta-19-37 in the Ta'nan Sag, and Well Ta-22-1 and Well Ta-21-1 in the Bayin Gobi Sag, a spore-pollen assemblage from the Damoguaihe Formation is named as Cicatricosisporites minutaestriatus- Aequitriradites spinulosus-Protopinus sp. assemblage in the Tamutsag Basin, Mongolia. The assemblage is characterized by abundant gymnosperm pollen and diverse fern spores, counted 46.35%–65.57% and 34.43%–52.58% in percentage respectively. Among the gymnosperm pollen, Pinuspollenites sp.(2.66%–16.94%), Protopinus sp.(0–11.38%) and Protopicea sp.(0–10.81%) are dominant; and Alisporites sp., Cerebropollenites sp., Podocarpidites sp., and Abietineaepollenites sp. are common. Some important elements, such as Chasmatosporites sp., Callialasporites prominulus, Parvisaccites sp., Parcisporites sp., Jiaohepollis cf. annulatus, J. bellus, J. verus, Polycingulatisporites sp., Schizaeoisporites certus, Classopollis annulatus are seen. Within the fern spores, Osmundacidites wellamanii(0.85%–4.93%), Appendicisporites sp.(0–4.45%), Baculatisporites comaumensis(0.80%–2.87%), Cicatricosisporites sp.(0.51%–2.66%), C. minor(0–2.14%), Foraminisporis asymmetricus(0–2.40%), Aequitriradites sp.(0– 2.19%) and Cyathidites minor(0–2.13%) are dominant; and some specie of Densoisporites, Cooksonites, Impardecispora, Pilosisporites, Schizaeosprites, Fixisporites, Leptolepidites, Trilobosporites, Kuylisporites, Klukisporites, Hsuisporites, Couperisporites, Maculatisporites are seen. The angiosperm pollen are rare in the assemblage, characterized by Clavatipollenites sp.(0–0.80%) and Songipollis sp.(0–0.27%). The geological age of the Damoguaihe Formation is assigned to Hauterivian – Barremian of Early Cretaceous according to the palynological data, due to the fact that there existed a lot of diverse spores of the family Schizaeaceae and prosperous gymnosperm saccat pollen which the corpus and sacci are differentiated completely, and the presence of early angiosperm pollen of Clavatipollenites. However, the zircon U-Pb isotopic dating of the volcanic rocks in the Nantun Formation indicated that the overlying strata of the Nantun Formation, i.e. the Damoguaihe Formation must be younger than 127.0±2.0–137.9±1.5 Ma. This is consistent with the palynological data. Furthermore, the vegetation reconstructed on the palynological data of the Damoguaihe Formation is conifer forest with shrubs and grassland, belonging to the semi-humid or humid middle to south subtropical climate. Moreover, three new species, namely Biretisporites punctatus sp. nov., Chasmatosporites reticulates sp. nov. and Concentrisporites contractus sp. nov. are described here. | WANG Liyan WAN Chuanbiao SUN Yuewu | 2014 | Acta Geologica Sinica(English Edition)2014，88，1： | 12 |
| 3 | Lopingian mixed floras from Linxi Formation in Soron area,Inner Mongolia显示文摘A lot of well-preserved plants from the Linxi Formation are collected in the Soron area,Inner Mongolia,consisting of 34 species of 16 genera. They are Late Permian in age. The flora is characterized by a lot of Angaran plants,such as Paracalamites,Comia,Rhachiphyllum,Iniopteris,Rufloria,etc. Some Cathaysian elements,such as Lobatannularia lingulata,L. multifolia,Fascipteris Cathaysiantus,F. densata,Taeniopteris szei,Cladophlebis liulinensis and C. permica,are also mixed within the present flora. This indicates that the Soron of Inner Mongolia was located in the sector between the Angaran and Cathysian floristic provinces in Lopingian. It is beneficial for depicting the location and the evolution of the Solenker--Xar Moron suture zone in the phytogeographic view. The transmigration of tropical and subtropical Cathaysian plants to the north indicates that the Paleoasian Ocean was closed during the late Permian along the suture zone. | ZHANG Dejun SUN Yuewu DING Haisheng YANG Zhenyuan TANG Lijing | 2014 | Global Geology2014，17，2： | 10 |
| 4 | Sporopollen Assemblages from the Cretaceous Yimin Formation of the Hailar Basin,Inner Mongolia,China显示文摘Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are (in ascending order): the Impardecispora-Aequitriradites-Clavatipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites-Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data. | WAN Chuanbiao QIAO Xiuyun XU Yanbin SUN Yuewu REN Yanguang JIN Yudong GAO Ping LIU Tongyan | 2005 | Acta Geologica Sinica(English Edition)2005，79，4： | 9 |
| 5 | Numerical investigation of dual-porosity model with transient transfer function based on discrete-fracture model显示文摘Based on the characteristics of fractures in naturally fractured reservoir and a discrete-fracture model, a fracture network numerical well test model is developed.Bottom hole pressure response curves and the pressure field are obtained by solving the model equations with the finite-element method. By analyzing bottom hole pressure curves and the fluid flow in the pressure field, seven flow stages can be recognized on the curves. An upscaling method is developed to compare with the dual-porosity model(DPM). The comparisons results show that the DPM overestimates the inter-porosity coefficient λ and the storage factor ω. The analysis results show that fracture conductivity plays a leading role in the fluid flow. Matrix permeability influences the beginning time of flow from the matrix to fractures. Fractures density is another important parameter controlling the flow. The fracture linear flow is hidden under the large fracture density.The pressure propagation is slower in the direction of larger fracture density. | Yizhao WAN Yuewu LIU Weiping OUYANG Guofeng HAN Wenchao LIU | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，5： | 7 |
| 6 | A numerical approach for pressure transient analysis of a vertical well with complex fractures显示文摘A new well test model for a vertical fractured well is developed based on a discrete-fracture model in which the fractures are discretized as one dimensional(1-D) entities.The model overcomes the weakness of complex meshing,a large number of grids, and instability in conventional stripe-fracture models. Then, the discrete-fracture model is implemented using a hybrid element finite-element method.Triangular elements are used for matrix and line elements for the fractures. The finite element formulation is validated by comparing with the semi-analytical solution of a single vertical fractured well. The accuracy of the approach is shown through several examples with different fracture apertures,fracture conductivity, and fracture amount. Results from the discrete-fracture model agree reasonably well with the stripefracture model and the analytic solutions. The advantages of the discrete-fracture model are presented in mesh generation, computational improvement, and abilities to handle complex fractures like wedge-shaped fractures and fractures with branches. Analytical results show that the number of grids in the discrete-fracture model is 10 % less than stripefracture model, and computational efficiency increases by about 50 %. The more fractures there are, the more the computational efficiency increases. | Yizhao Wan Yuewu Liu Wenchao Liu Guofeng Han Congcong Niu | 2016 | Acta Mechanica Sinica2016，32，4： | 7 |
| 7 | Effect of quadratic pressure gradient term on a one-dimensional moving boundary problem based on modified Darcy's law显示文摘A relatively high formation pressure gradient can exist in seepage flow in low-permeable porous media with a threshold pressure gradient, and a significant error may then be caused in the model computation by neglecting the quadratic pressure gradient term in the governing equations.Based on these concerns, in consideration of the quadratic pressure gradient term, a basic moving boundary model is constructed for a one-dimensional seepage flow problem with a threshold pressure gradient. Owing to a strong nonlinearity and the existing moving boundary in the mathematical model,a corresponding numerical solution method is presented.First, a spatial coordinate transformation method is adopted in order to transform the system of partial differential equations with moving boundary conditions into a closed system with fixed boundary conditions; then the solution can be stably numerically obtained by a fully implicit finite-difference method. The validity of the numerical method is verified by a published exact analytical solution. Furthermore, to compare with Darcy's flow problem, the exact analytical solution for the case of Darcy's flow considering the quadratic pressure gradient term is also derived by an inverse Laplace transform.A comparison of these model solutions leads to the conclusion that such moving boundary problems must incorporatethe quadratic pressure gradient term in their governing equations; the sensitive effects of the quadratic pressure gradient term tend to diminish, with the dimensionless threshold pressure gradient increasing for the one-dimensional problem. | Wenchao Liu Jun Yao Zhangxin Chen Yuewu Liu | 2016 | Acta Mechanica Sinica2016，32，1： | 7 |
| 8 | Cretaceous Volcanic Events in Southeastern Jilin Province,China:Evidence from Single Zircon U-Pb Ages显示文摘摘要:在东南的吉林省的中生代暴烈的岩石是在东北区域的巨大的中生代暴烈的带的一个重要部件。他们的形成的年龄的学习意义大在东北中国认出中生代暴烈的统治。与在西方的辽宁的稀罕中生代生物区系和广泛的中生代矿化作用的研究一起,很多个研究人员集中了于中生代暴烈的事件。作者用单个锆石 U-Pb 在东南的吉林省学习了白垩纪暴烈的岩石的年龄。在 Tonghua 区域的 Sankeyushu 形成暴烈的岩石是 119.2 妈在的结果表演变老,在 Jiutai 区域的 Yingcheng 形成 113.4 吗?? | CHEN Yuejun SUN Chunlin SUN Yuewu SUN Wei | 2008 | Acta Geologica Sinica(English Edition)2008，82，6： | 7 |
| 9 | Study on the thermal protection performance of superalloy honeycomb panels in high-speed thermal shock environments显示文摘The thermal protection performance of superalloy honeycomb structure in high-temperature environments are important for thermal protection design of high-speed aircrafts. By using a self-developed transient aerodynamic thermal simulation system, the thermal protection performance of superalloy honeycomb panel was tested in this paper at different transient heating rates ranging from5℃/s to 30℃/s, with the maximum instantaneous temperature reaching 950℃.Furthermore, the thermal protection performance of superalloy honeycomb structure under simulated thermal environments was computed for different high heating rates by using 3D finite element method, and a comparison between calculational and experimental results was carried out. The results of this research provide an important reference for the design of thermal protection systems comprising superalloy honeycomb panel. | Dafang Wu Anfeng Zhou Liming Zheng Bing Pan Yuewu Wang | 2014 | Theoretical & Applied Mechanics Letters2014，4，2： | 6 |
| 10 | Numerical study on rainfall infiltration in rock-soil slop显示文摘A mathematical model for the rain infiltration in the rock-soil slop has been established and solved by using the finite element method. The unsteady water infiltrating process has been simulated to get water content both in the homogeneous and heterogeneous media. The simulated results show that the rock blocks in the rock-soil slop can cause the wetting front moving fast. If the rain intensity is increased, the saturated region will be formed quickly while other conditions are the same. If the rain intensity keeps a constant, it is possible to accelerate the generation of the saturated region by properly increasing the vertical filtration rate of the rock-soil slop. However, if the vertical filtration rate is so far greater than the rain intensity, it will be difficult to form the saturated region in the rock-soil slop. The numerical method was verified by comparing the calculation results with the field test data. | LIU Yuewu LIU Qingquan CHEN Huixin GONG Xin ZHANG Dawei YAO Deliang LI Lianxiang | 2005 | Science China(Technological Sciences)2005，48，z1： | 5 |
| 11 | Model-Based Degree Estimation of Unbalance and Misalignment in Flexible Coupling-rotor System显示文摘The condition of rotor system must be assessed in order to develop condition-based maintenance for rotating machinery. It is determined by multiple variables such as unbalance degree,misalignment degree,the amount of bending deformation of the shaft,occurrence of shaft crack of rotor system and so on. The estimation of the degrees of unbalance and misalignment in flexible coupling-rotor system is discussed. The model-based approach is employed to solve this problem. The models of the equivalent external loads for unbalance and misalignment are derived and analyzed. Then,the degrees of unbalance and misalignment are estimated by analyzing the components of the equivalent external loads of which the frequencies are equal to the 1 and 2 times running frequency respectively. The equivalent external loads are calculated according to the dynamic equation of the original rotor system and the differences between the dynamical responses in normal case and the vibrations when the degree of unbalance or misalignment or both changes. The denoise method based on bandpass filter is used to decrease the effect of noise on the estimation accuracy. The numerical examples are given to show that the proposed approach can estimate the degrees of unbalance and misalignment of the flexible coupling-rotor system accurately. | LI Changyou XU Minqiang GUO Song WANG Yuewu WANG Rixin | 2009 | Chinese Journal of Mechanical Engineering2009，22，4： | 5 |
| 12 | Stratigraphic framework of late Paleozoic in northeastern China显示文摘Late Paleozoic strata in northeastern China are distributed in a zonal pattern around the old-land on the Jiamusi-Mongolia Block.They are composed of active deposits in the regular distributed tectonic lithofacies zones.This indicates that the late Paleozoic strata belong to continental margin deposits.According to the strong conformability of the sedimentary strata in the same continental margin and distinct differences among the three continental margins,three stratigraphical regions of the Jiamusi-Mongolia Stratigraphical Province are recognized along the northern,southern and eastern margins of the Jiamusi-Mongolia Block,named respectively as Xing'an Stratigraphical Region,Inner Mongolia grass--Songhua River Stratigraphical Region and Baoqing--Hunchun Stratigraphical Region.Due to the characteristics of continental margin deposits and active sediments,the strata can be correlated on the level of formation by the methods of analysing the rock association in the same stratigraphic region.Therefore,some revisions of the lithological formations of the late Paleozoic strata in northeastern China have been made,and a new chart of lithostratigraphic correlation has been proposed.Furthermore,the present stratigraphic framework is setting on the International Stratigraphic Chart on the level of stage,after comprehensive researches to lithostratigraphy,biostratigraphy and chronostratigraphy,especially the conodont biostratigraphy and isotopic ages of volcanic rocks obtained in recent years. | WANG Chengwen LI Ning SUN Yuewu ZONG Pu ZHAO Guowei LIU Hui MA Xiaoqin | 2013 | Global Geology2013，16，1： | 4 |
| 13 | Dissipative particle dynamics simulation of wettability alternation phenomena in the chemical flooding process显示文摘Wettability alternation phenomena is consideredone of the most important enhanced oil recovery (EOR)mechanisms in the chemical flooding process and inducedby the adsorption of surfactant on the rock surface. Thesephenomena are studied by a mesoscopic method named asdissipative particle dynamics (DPD). Both the alterationphenomena of water-wet to oil-wet and that of oil-wet towater-wet are simulated based on reasonable definition ofinteraction parameters between beads. The wetting hysteresisphenomenon and the process of oil-drops detachment fromrock surfaces with different wettability are simulated byadding long-range external forces on the fluid particles. Thesimulation results show that, the oil drop is liable to spreadon the oil-wetting surface and move in the form of liquid filmflow, whereas it is likely to move as a whole on the water-wettingsurface. There are the same phenomena occuring inwettability-alternated cases. The results also show that DPDmethod provides a feasible approach to the problems of seepageflow with physicochemical phenomena and can be usedto study the mechanism of EOR of chemical flooding. | Xiaobo Li Yuewu Liu Jianfei Tang Shujiao Li | 2009 | Acta Mechanica Sinica2009，25，5： | 4 |
| 14 | Neogene palynological assemblages in the west slope of Songliao Basin and their geological implications显示文摘Abundant palynological fossils are found from the drill core in the west slope of Songliao Basin, the first full coring borehole that drilled throughout the Neogene. Two Palynological assemblages are recognized according to their vertical distributions, i.e., the late early Miocene–middle Miocene assemblage from the Da'an Formation named as Caryapollenites simplex-Momipites coryloides-Celtispollenites sp.-Tsugaepollenites igniculus, and the late Miocene-early Pliocene assemblage from the Taikang Formation named as Artemisiaepollenites minor-Betulaceoipollenites sp.-Carpinipites sp.-Polypodiaceaesporites sp. On the basis of the composition of each assemblage, we infer that the climate was warm-temperate to sub-tropic during the late early Miocene–middle Miocene and the vegetation was mainly deciduous broadleaved forest and subordinate coniferous and broad-leaved mixed forest with few understory ferns, and probably some shallow fresh water wetlands. The climate then turned cooler and drier in the late Miocene–early Pliocene, represented by the development of xerophytic herbs and temperate plants, although the canopy of the forest remained relatively stable. The results significantly improve the understanding of the Cenozoic palynostratigraphy in the Songliao Basin, and provide new data for both stratigraphical correlation and paleovegetational and paleoclimatical analysis in adjacent area. | WAN ChuanBiao SUN YueWu XUE YunFei QIAO XiuYun JIN YuDong ZHANG YiYong | 2014 | Science China Earth Sciences2014，57，10： | 3 |
| 15 | Discovery of Late Permian Jianshanzi volcanic rocks in Qinghe valley of northern Liaoning and its geologic significance显示文摘Jianshanzi volcanic rocks at Qinghe valley in the northern Liaoning were considered belonging to Early Proterozoic Gaojiayu Formation of Liaohe Group, or to Early Cambrian Beidagou Formation of Qinghezhen Group, or Middle-Late Proterozoic Shenjiapu Formation-Complex of Kaiyuan Group-complex. Dating the zircons from the dacite with schistosity is 2 506 Ma in method of U-Pb (SHRIMP). This evidence indicates the rocks may be referred to Late Permian in age. Discovery of the rocks is significant to re-recognize stratigraphic property of 'Liaohe Group', regional geotectonic location and revolution of orogenic zone in Qinghe valley of the northern Liaoning. | Yuejun CHEN Chunlin SUN Yuewu SUN | 2008 | Global Geology2008，11，3： | 2 |
| 16 | Experimental study on pore pressure in rock-soil slope during reservoir water level fluctuation显示文摘A test system was developed for measuring the pore pressure in porous media, and a new model was devised for the pore pressure testing in both saturated and unsaturated rock-soil. Laboratory experiments were carried out to determine the pore pressure during water level fluctuation. The variations of transient pore pressure vs. time at different locations of the simulated rock-soil system were acquired and processed, and meanwhile the deformation and failure of the model are observed. The experiment results show that whether the porous media are saturated or not, the transient pore pressure is mainly dependent on the water level fluctuation, and coupled with the variation of the stress field. | LIU Yuewu CHEN Huixin LIU Qingquan GONG Xin ZHANG Dawei LI Lianxiang | 2005 | Science China(Technological Sciences)2005，48，z1： | 2 |
| 17 | Organic-rich formation and hydrocarbon enrichment of lacustrine shale strata:A case study of Chang 7 Member显示文摘Lacustrine shale is an important target for the exploration of unconventional oil and gas in China beyond marine shale gas.However,the formation environment of lacustrine shale differs from that of marine shale,resulting in a different reservoir composition,organic matter,oil and gas content,and hydrocarbon mobility.In this study,the Chang 7 shale of the Yanchang Formation in the Ordos Basin was used to analyze the effect of volcanic activity on the paleoproductivity and preservation conditions during the formation of lacustrine shale.The results show that algae and bacteria were developed before the eruption.After the eruption,the number of bacteria declined,but the increased prosperity of algae reflects that the volcanic activity enhanced ancient productivity.The sulfate generated by volcanic activity promotes bacterial sulfate reduction,and the produced H_(2)S leads to a strong reducing environment in the waterbody,which is conducive to the preservation of organic matter.Organic geochemical analysis shows that the black shale in the shale strata has a high total organic carbon(TOC)content and strong hydrocarbon generation potential,whereas the tuff has a low TOC content and can scarcely generate hydrocarbons,indicating that the tuff deposited by volcanic activity cannot be considered as effective source rock.In terms of storage space,shale is mainly laminar and dispersed,and it includes organic and inorganic pores.The development of organic pores is affected by thermal maturity,whereas inorganic pores mainly occur between detrital particles and crystals.Tuff is mainly supported by heterogeneous matrix and associated with alteration.Its pores include inter-and intragranular mineral pores.The development of tight sandstone pores is affected by compaction,cementation,and dissolution,which mainly consist of intra-and intergranular pores.The Chang 7 lacustrine shale generally contains oil,but different lithologies have different oil drainage efficiencies.Sandstone and shale exhibit the best and worst oil drainage efficiency,respectively.It is mainly affected by the pore size distribution,fluid properties,and rock wettability.Therefore,the development of shale oil should mainly focus on lacustrine shale formations with interbeds.The mutual dissolution of organic matter and hydrocarbons in the shale section leads to the poor mobility and difficult development of hydrocarbons. | Quanyou LIU Peng LI Zhijun JIN Yuewu SUN Guang HU Dongya ZHU Zhenkai HUANG Xinping LIANG Rui ZHANG Jiayi LIU | 2022 | Science China Earth Sciences2022，65，1： | 2 |
| 18 | The simula- tion of Klinkenberg effect in porous medium with Lat- tice Boltzmann method 显示文摘 | Liu Yuewu Zhou Fuxin Yan Guangwu | 2003 | Computational Physics2003，20，2： | 1 |
| 19 | Optimization of culture medium for yellow pigments production with Monascus anka mutant using response surface methodology显示文摘 | Bo zhou Jufang Wang Yuewu Pu | 2009 | European Food Research and Technology2009，228，6： | 1 |
| 20 | Molecular dynamics simulations of microstrure of nanocrystalline copper显示文摘 | Wen Yuhua Zhou Fuxin Liu Yuewu | 2001 | Chinese Physics Letter2001，31，3： | 1 |
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