Дисертації з теми "Hydrate Saturation"
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Heber, Ryan Conover. "Evidence for Widespread, Low Saturation Gas Hydrate in the Barents and Norwegian Seas." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587052616831745.
Повний текст джерелаJihui, Jia. "Microscopic and Macroscopic Characterization on Mechanical Properties of Gas Hydrate." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215521.
Повний текст джерелаSahoo, Sourav Kumar. "The effect of gas hydrate saturation and distribution on the geophysical properties of marine sediments." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/423695/.
Повний текст джерелаBoukongo, Sotaine Marie Aimé. "Etude des hydrates de gaz sur la marge active de Nankai (Japon) : analyse de données de sismique réflexion 3D et inversion des formes d'onde." Paris, Institut de physique du globe, 2007. http://www.theses.fr/2007GLOB0002.
Повний текст джерелаThe analysis of 3D seismic reflection data on the Nankai (Japan) active margin showed evidenceof a BSR (bottom simulating reflector) and a double BSR. The BSR is an acoustic impedance contrastat the interface separating sediments rich in gas hydrate, having a high velocity above, and sedimentsrich in free gas, having a low velocity below. The double BSR can be considered as a fossil BSR orcan result from a mixture of gases of different compositions within the sediments. The BSR depth isused to constrain the thermal regime in the 3D box (5 km x 42. 5 km) of the Nankai margin. The heatflow calculated from BSR depths gives values between 20-68 mW/m2. Strong BSR amplitudes arelocalized in the zone where the heat flow is relatively low, and weak BSR amplitudes are localized inthe zone where the heat flow is relatively high. The circulation of warm fluids would perturb theamplitude of BSR. The BSR is absent around the Tokai fault in the slope basin zone, and issometimes discontinuous or absent around the Kodaiba fault in the forearc basin zone. In the forearcbasin where the distribution of the BSR is more important, full waveform inversion results allowed toconfirm the presence of a zone with high velocity above the BSR, which could be due to the presenceof gas hydrate in sediments. Just below the BSR, we find a low velocity zone, which could be due tothe presence of the free gas in sediments. Strong BSR amplitude could be correlated with the presenceof underlaying free gas. The estimated concentration of gas hydrate is lower than 25 %. The meanvolume of gas hydrate calculated is about 85 x 107 m3. The estimated concentration of free gas variesbetween 0. 7 and 8 %. The mean volume of free gas calculated is about 6 x 107 m3. In the study area,we conclude that these concentrations/volumes are enormous but, they cannot constitute aneconomically exploitable reservoir, because gas hydrates are disseminated in the sediments
竹内, 道樹. "乳酸菌の不飽和脂肪酸代謝に関する生化学的研究とその応用". Kyoto University, 2015. http://hdl.handle.net/2433/199538.
Повний текст джерелаTakeuchi, Michiki. "Biochemical and applied studies on unsaturated fatty acid metabolisms in lactic acid bacteria." Kyoto University, 2015. http://hdl.handle.net/2433/199370.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第19046号
農博第2124号
新制||農||1032(附属図書館)
学位論文||H27||N4928(農学部図書室)
31997
京都大学大学院農学研究科応用生命科学専攻
(主査)教授 小川 順, 教授 加納 健司, 教授 植田 充美
学位規則第4条第1項該当
Hillier, Heidi Therese. "How is substrate selectivity in hydride transfer decided in an alcohol dehydrogenase? : Directed evolution of alcohol dehydrogenase A from Rhodococcus ruber DSM 44541 through iterative saturation mutagenesis, a study to understand the structure and function relationship of enzymatic catalysis." Thesis, Uppsala universitet, Biokemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331683.
Повний текст джерелаBehseresht, Javad. "Physical controls on hydrate saturation distribution in the subsurface." 2012. http://hdl.handle.net/2152/19558.
Повний текст джерелаtext
Bhatnagar, Gaurav, Walter G. Chapman, George J. Hirasaki, Gerald R. Dickens, and Brandon Dugan. "RELATING GAS HYDRATE SATURATION TO DEPTH OF SULFATE-METHANE TRANSITION." 2008. http://hdl.handle.net/2429/1179.
Повний текст джерелаGoldberg, David, Gilles Guerin, Alberto Malinverno, and Ann Cook. "VELOCITY ANALYSIS OF LWD AND WIRELINE SONIC DATA IN HYDRATE-BEARING SEDIMENTS ON THE CASCADIA MARGIN." 2008. http://hdl.handle.net/2429/1619.
Повний текст джерелаLu, Hailong, Huang Zeng, John A. Ripmeester, Tatsuji Kawasaki, Tetsuya Fujii, and Masaru Nakamizu. "SEDIMENT CONTROL ON THE SATURATION LEVEL OF GAS HYDRATE IN NATURE ENVIRONMENTS." 2008. http://hdl.handle.net/2429/1101.
Повний текст джерелаKawasaki, Tatsuji, Tetsuya Fujii, Masaru Nakamizu, Hailong Lu, and John A. Ripmeester. "EXPERIMENTAL STUDIES OF THE SATURATION LEVEL OF METHANE HYDRATE IN THE EASTERN NANKAI TROUGH SEDIMENTS." 2008. http://hdl.handle.net/2429/1095.
Повний текст джерелаLin, Yi-chin, and 林義欽. "Velocity structure and gas hydrate saturation study on Yuan-an ridge offshore southwest Taiwan." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/22512810987387544277.
Повний текст джерела國立中央大學
地球物理研究所
99
Interest in natural gas hydrates has grown in recent years with the recognition of the gas-hydrate bearing sediments offshore the southwestern Taiwan. Several oceanographic cruises were conducted in the aim of acquiring more information about the presence of gas hydrate. The collected reflection and refraction seismic data are extensively used to map and interpret the gas hydrate zones for the area of the Hengchun Ridge deformation front, accretionary wedge of the eastern subducting Maniala subduction zone, and the passive China continental Margin. Among them, a wide angle seismic experiment consisted of 24 recovered Ocean Bottom Seismometers (OBSs) were acquired along 4 in-line transects offshore southwestern Taiwan in November 2004 and several off-lines and cross-lines data were recorded simultaneously. In this study, we use PStomo_eq software to perform a 3-D acoustic inversion velocity analysis of the first arrivals records of the OBS by using all the in-lines, off-lines and cross-lines information. By analysing the inverted 3-D dimensional Vp models, we estimate the density and the thickness of the marine sediments and crust. Based on the core data, the porosity, the lithology and other physical properties were assumed and the Weighting equation is applied for the estimation of the gas hydrate concentration. In our study , the gas hydrate saturation is about 10%~30%, most of them are concentrated below the Yuan-An ridge and the anticlines.
Tu, Shu-Lin, and 塗書琳. "Using Pre-stack Depth Migration Technique to Analyze the Characteristics and Saturation of Gas Hydrate Offshore Southwestern Taiwan." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76379657231772836024.
Повний текст джерела臺灣大學
海洋研究所
98
The area offshore southwestern Taiwan is the place where active Luzon accretionary wedge province meets the passive China continental margin province. Not only marine seismic reflection data indicate that large amount of gas hydrates and free gases may exist beneath the seafloor sediments, but geochemical data also reveal high methane flux and shallow sulfide-methane interface (SMI) at many cored locations. In this study, we intend to investigate detail distribution and possible formation and migration of gas hydrates in both active and passive continental margins. We implement pre-stack depth migration technique to derive depth sections with accurate velocity information from large-offset multichannel seismic data collected during the 2009 TAIGER survey. We focus our study on the Yung-An Ridge and the Formosa Ridge areas in active and passive margin settings, respectively. Large variations in acoustic velocities are observed in both areas where BSRs are prominent. The high velocity values derived in shallow sedimentary layers above BSR range from 1750 to 2000 m/s, and this high velocity zone may indicate the existence of gas hydrates. The low velocity values ranging from 1450 to 1550 m/s below BSR are interpreted to be the free gases zone. Through rock physics modeling, we establish the relationships between velocity and gas hydrate saturation values. Estimated gas hydrate saturation values suggest that gas hydrate could occupy up to 50 % of pore space in the Yung-An Ridge area and 35 % of pore space in the Formosa Ridge area. Comparing seismic images of the constructed depth sections with corresponding velocity models, we suggest that the distribution of gas hydrates and free gases in the Yung-An Ridge area are controlled by complex fault systems and porous sand layers. Distribution of gas hydrates and free gases in the Formosa Ridge area are controlled by submarine erosion and mass movement processes and development of faults and fractures in the Formosa Ridge area.
Shih, Tzu-Yung, and 施姿詠. "Application of P-S converted waves in estimating the gas-hydrate saturation of the sedimentary layer near Yuan-An Ridge." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/70507132391150528026.
Повний текст джерела國立臺灣海洋大學
應用地球科學研究所
101
In this study, we analyze four-component (hydrophone, vertical and two horizontal components) data recorded from 25 ocean-bottom seismometers (OBS) in 2008 for investigating converted shear waves and for estimating gas-hydrate saturation west of the Yuan-An Ridge off SW Taiwan. Firstly, initial Vp/Vs models west of the Yuan-An Ridge were constructed for P-wave velocity models based on the previous studies. Subsequently, travel time and amplitude of the P-S converted waves were synthesized based on initial Vp/Vs models and were superimposed on four-component OBS data for determining the phases of P-S converted waves. Secondly, we picked the travel times of the P-S converted waves from the four-component OBS data to invert the Vp/Vs model. Finally, we reduce the travel time errors to obtain a better Vp/Vs model. Furthermore, the gas-hydrate saturation was estimated by the four-phases four-materials (water, free gas, hydrates and rock matrix) of Wood’s equation based on the P-wave velocity (1.80-1.95 km/s) and the Vp/Vs (3.18-3.38) of gas-hydrate layer. Therefore, hydrate saturation of 5 -17% are estimated in the west sedimentary basins at the Yuan-An Ridge. Since the Vp/Vs ratio west of Yuan-An Ridge in the second sedimentary layer is higher than that in the other layers, free gas may be migrated along the thrust faults and to accumulate the hydrate below the Yuan-An Ridge.