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| 1 | Mechanical property of artificial methane hydrate under triaxial compression显示文摘Methane production from hydrate reservoir may induce seabed slide and deformation of the hydrate-bearing strata.The research on mechanical properties of methane hydrate is considered to be important for developing an efficient methane exploitation technology.In this paper,a triaxial test system containing a pressure crystal device was developed with the conditions to stabilize the hydrate.A series of triaxial shear tests were carried out on artificial methane hydrate specimen.In addition,mechanical characteristics of methane hydrate were studied with the strain rates of 0.1 and 1.0 mm/min,respectively,under the conditions of different temperatures(T =-5,-10,and-20 ℃) and confining pressures(P = 0,5,10,15,and 20 MPa).The preliminary results show that when the confining pressure was less than 10 MPa,the increase of confining pressure leaded to the enhancement of shear strength.Furthermore,the decreasing temperature and the increasing strain rate both caused the increase in shear strength. | Yongchen Song Feng Yu Yanghui Li Weiguo Liu Jiafei Zhao | 2010 | Journal of Natural Gas Chemistry2010，19，3： | 28 |
| 2 | Seismic Reflection Characteristics and Evolution of Intrusions in the Qiongdongnan Basin: Implications for the Rifting of the South China Sea显示文摘The Qiongdongnan Basin(QDNB) is situated in the extensional zone at the vertex of the V-shaped northwest sub-basin, non-volcanic northern margin of the South China Sea(SCS). From north to south, the thickness of the continental lithosphere decreases from 22 km on the northern continental shelf to 17 km at the deepest area of the central depression. A sharp change on the crustal structure is of importance to hydrocarbon exploration yet the dynamic causes remain unknown. A comprehensive study including (1) interpretation of seismic profiles,(2) P-wave velocity data modeling, and (3) magnetic anomalies analysis reveals that there are some high-density intrusions along the lithospheric thinning belt. Chaotic reflections can be found in the southwest of the QDNB, with a low velocity(<3.4 km/s), while in the center and the east, the intensively deformed strata passing towards the diapir flanks and their high velocities(>6 km/s) suggest the existence of igneous diapirs. Diapirism differentiation are primarily achieved through analysis of the contact relationship and the thickness variations in the surrounding strata. The first phase of diapirism along the Songnan low uplift occurred in the Late Mesozoic, and the second phase of diapirism in a form of subsequent gas movement remained active until the Late Quaternary. The distribution and the evolution of the diapirs would have major implications for post-rift emplacement. | Yanghui Zhao Dianjun Tong Ying Song Linlong Yang Chao Huang | 2016 | Journal of Earth Science2016，27，4： | 8 |
| 3 | Numerical studies of hydrate dissociation and gas production behavior in porous media during depressurization process显示文摘In this study,a numerical model is developed to investigate the hydrate dissociation and gas production in porous media by depressurization.A series of simulation runs are conducted to study the impacts of permeability characteristics,including permeability reduction exponent,absolute permeability,hydrate accumulation habits and hydrate saturation,sand average grain size and irreducible water saturation.The effects of the distribution of hydrate in porous media are examined by adapting conceptual models of hydrate accumulation habits into simulations to govern the evolution of permeability with hydrate decomposition,which is also compared with the conventional reservoir permeability model,i.e.Corey model.The simulations show that the hydrate dissociation rate increases with the decrease of permeability reduction exponent,hydrate saturation and the sand average grain size.Compared with the conceptual models of hydrate accumulation habits,our simulations indicate that Corey model overpredicts the gas production and the performance of hydrate coating models is superior to that of hydrate filling models in gas production,which behavior does follow by the order of capillary coating>pore coating>pore filling>capillary filling.From the analysis of t1/2,some interesting results are suggested as follows:(1) there is a 'switch' value(the'switch'absolute permeability) for laboratory-scale hydrate dissociation in porous media,the absolute permeability has almost no influence on the gas production behavior when the permeability exceeds the 'switch' value.In this study,the 'switch' value of absolute permeability can be estimated to be between 10 and 50 md.(2) An optimum value of initial effective water saturation Sw,e exists where hydrate dissociation rate reaches the maximum and the optimum value largely coincides with the value of irreducible water saturation S wr,e.For the case of Sw,Swr,e,there are different control mechanisms dominating the process of hydrate dissociation and gas production. | Xuke Ruan Mingjun Yang Yongchen Song Haifeng Liang Yanghui Li | 2012 | Journal of Natural Gas Chemistry2012，21，4： | 3 |
| 4 | Adsorption isotherms and kinetic characteristics of methane on block anthracite over a wide pressure range显示文摘It is important to quantitatively understand the methane adsorption and transport mechanism in coal for an evaluation of the reserves and for its production forecast. In this work, a block coal sample was chosen to perform the CH4 adsorption experiments using the gravimetric method at temperatures of 293.60 K, 311.26 K, 332.98 K and 352.55 K and pressures up to 19 MPa. The excess adsorption capacity of CH4 in dry block anthracite increased, followed by a sequence decrease with the increasing pressure. High temperature restrained the growth of the excess adsorption due to that the adsorption is an intrinsically physical and exothermic process. The excess adsorption peak decreased slowly with the increase of temperature and intersected at a pressure of more than 18 MPa; meanwhile, the pressure at the excess adsorption peak increased.The existing correlations were examined in terms of density rather than pressure. The DR+k correlation, with an average relative deviation of ±0.51%, fitted our data better than the others, with an average relative deviation of up to 2.29%. The transportation characteristics of CH4 adsorption was also investigated in this study, including the adsorption rate and diffusion in block coal. The kinetic data could be described by a modified unipore model. The adsorption rates were found to exhibit dependence on pressure and temperature at low pressures, while the calculated diffusivities exhibited little temperature dependence. In addition, the kinetic characteristics were compared between CH4 and CO2 adsorption on the block coal. The excess adsorption ratios of CO2 to CH4obtained from the DR+k model decreased with the increasing pressure. | Wanli Xing Yongchen Song Yi Zhang Weiguo Liu Lanlan Jiang Yanghui Li Yuechao Zhao | 2015 | Journal of Energy Chemistry2015，24，2： | 2 |
| 5 | The status of natural gas hydrate research in China: A review显示文摘 | Song Yongchen Yang Lei Zhao Jiafei Liu Weiguo Yang Mingjun Li Yanghui | 2014 | Renewable and Sustainable Energy Reviews2014，31，： | 1 |
| 6 | Artesunate alleviates hepatic fibrosis induced by multiple pathogenic factors and inflammation through the inhibition of LPS/TLR4/NF-κB signaling pathway in rats显示文摘 | Lina Lai Yunxia Chen Xiaoxia Tian Xujiong Li Xiaojing Zhang Jingwen Lei Yanghui Bi Buwu Fang Xiaoliang Song | 2015 | European Journal of Pharmacology2015，，： | 1 |
| 7 | The glutamate biosynthetic pathway in brain:a novel mechanism of moderate UV-induced neurobehavioral changes显示文摘Using single-cell mass spectrometry technology,Zhu et al.[1] recently revealed that a novel intra-neuronal glutamate(GLU)biosynthetic pathway contributes to sunlight ultraviolet(UV)-induced neurobehavioral effects.In the study,moderate UV exposure was found to increase blood levels of urocanic acid(UCA),which may cross the blood–brain barrier(BBB).Subsequently,UCA promotes GLU biosynthesis and release in various brain regions,including motor cortex and hippocampus.Strikingly,UV exposure improves motor learning and object recognition memory.The inhibitor against urocanase,an enzyme critical for the conversion of UCA to GLU,reverses the UV exposure-related neurological effects.Thus,the activation of UCA-GLU metabolic pathway mediates the process of UV-triggered neurobehavioral changes(Fig.1). | Jianping Cao Lan She Yanghui Song | 2019 | Acta Biochimica et Biophysica Sinica2019，51，2： | 0 |
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