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INFLUENCE OF CHEMICAL ADDITIVES ON gas hydrate FORMATION

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化工学报 2003年第Z1期54卷 37-40页

作者： TANG Cuiping and FAN Shuanshi (center for gas hydrate Research, Guangzhou Institute of Energy Conversion, Chinese Academy of Science, Guangzhou 510070, Guangdong, China) center for gas hydrate Research Guangzhou Institute of Energy Conversion Chinese Academy of Science Guangzhou 510070 Guangdong China

One surfactant as sodium dodecyl sulfate (SDS) and one synthesized sample as gas hydrate inhibitor are introduced in this paper. Through experiments we prove sodium dodecyl sulfate can accelerate the formation rate of... 详细信息

关键词： natural gas hydrate, chemical additive, kinetic inhibitor

THERMAL CONDUCTIVITY OF THF CLATHRATE hydrate FROM 243 K TO 263 K

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化工学报 2003年第Z1期54卷 71-75页

作者： HUANG Duzi~(1,2) and FAN Shuanshi~1(~1center for gas hydrate, Guangzhou Institute of Energy Conversion, CAS, Guangzhou, 510070, Guangdong, China ~2 Department of Thermal Science & Energy Engineering, USTC, Hefei, 230036, Anhui, China) center for gas hydrate Guangzhou Institute of Energy Conversion CAS Guangzhou 510070 Guangdong China Department of Thermal Science & Energy Engineering USTC Hefei 230036 Anhui China center for gas hydrate Guangzhou Institute of Energy Conversion CAS Guangzhou 510070 Guangdong China

Using transient plane source technique, we measured THF hydrate thermal conductivity from 243 K to 263 K. The sample THF solution is over saturated in order to avoid the effect of ice. And also to avoid the effect of crystal anisotropy, the THF hydrate was crushed to measure. In the test temperature value increases with the temperature increasing.

关键词： THF in or it THERMAL CONDUCTIVITY OF THF CLATHRATE hydrate FROM 243 K TO 263 K of that

Decomposition behaviors of methane hydrate in porous media below the ice melting point by depressurization

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2207-2212页

作者： Yu Zhang Tian Wang Xiaosen Li Kefeng Yan Yi Wang Zhaoyang Chen Guangzhou Institute of Energy Conversion Key Laboratory of Gas HydrateChinese Academy of SciencesGuangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China Guangzhou center for gas hydrate Research Chinese Academy of SciencesGuangzhou 510640China University Science&Technology of China Nano Science&Technology InstituteSuzhou 215123China

The decomposition behaviors of methane hydrate below the ice melting point in porous media with different particle size and different pore size were *** silica gels with the particle size of 105–150μm,150–200μm and 300–450μm,and the mean pore diameters of 12.95 nm,17.96 nm and 33.20 nm were used in the *** recovery and temperature change curves were determined for each *** hydrate decomposition process in the experiments can be divided into the depressurization period and the isobaric *** temperature in the system decreases quickly in the depressurization process with the hydrate decomposition and reaches the lowest point in the isobaric *** hydrate decomposition in porous media below ice-melting point is very fast and no self-perseveration effect is *** hydrate decomposition is influenced both by the driving force and the initial hydrate *** the experiments with the high hydrate saturation,the hydrate decomposition will stop when the pressure reaches the equilibrium dissociation *** stable pressure in the experiment with high hydrate saturation exceeds the equilibrium dissociation pressure of bulk hydrate and increases with the decrease of the pore size.

关键词： Methane hydrate Depressurization Porous media Decomposition Ice-melting point

Acoustic characteristics of cold-seep methane bubble behavior in the water column and its potential environmental impact

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Acta Oceanologica Sinica 2020年第5期39卷 133-144页

作者： Jiangong Wei Tingting Wu Xiguang Deng Zongze Yu Lifeng Wang gas hydrate Engineering and Technology center Guangzhou Marine Geological SurveyGuangzhou 510075China MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyGuangzhou 510075China

The amount of methane leaked from deep sea cold seeps is enormous and potentially affects the global warming,ocean acidification and global carbon *** is of great significance to study the methane bubble movement and dissolution process in the water column and its output to the *** bubbles produce strong acoustic impedance in water bodies,and bubble strings released from deep sea cold seeps are called"gas flares"which expressed as flame-like strong backscatter in the water *** characterized the morphology and movement of methane bubbles released into the water using multibeam water column data at two cold *** result shows that methane at site I reached 920 m water depth without passing through the top of the gas hydrate stability zone(GHSZ,850 m),while methane bubbles at site II passed through the top of the GHSZ(597 m)and entered the non-GHSZ(above 550 m).By applying two methods on the multibeam data,the bubble rising velocity in the water column at sites I and II were estimated to be 9.6 cm/s and 24 cm/s,*** velocity is positively associated with water depth which is inferred to be resulted from decrease of bubble size during methane ascending in the *** with numerical simulation,we concluded that formation of gas hydrate shells plays an important role in helping methane bubbles entering the upper water bodies,while other factors,including water depth,bubble velocity,initial kinetic energy and bubble size,also influence the bubble residence time in the water and the possibility of methane entering the *** estimate that methane gas flux at these two sites is 0.4×10~6–87.6×10~6 mol/a which is extremely small compared to the total amount of methane in the ocean body,however,methane leakage might exert significant impact on the ocean acidification considering the widespread distributed cold *** addition,although methane entering the atmosphere is not observed,further research is still needed to

关键词： gas bubble methane cold seep Nigerian Continental Margin Greenhouse effect Makran accretion wedge

Detection and indication of 1,3,4-C27-29 triol in the sediment of northern South China Sea

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Science China Earth Sciences 2016年第6期59卷 1187-1194页

作者： ZHU XiaoWei MAO ShengYi WU NengYou JIA GuoDong SUN YongGe GUAN HongXiang WU DaiDai Key Laboratory of Marginal Sea Geology South China Sea Institute of OceanologyCASGuangzhou 510301China Key Laboratory of Marginal Sea Geology Guangzhou Institute of GeochemistryCASGuangzhou 510640China Key Laboratory of gas hydrate Guangzhou Institute of Energy ConversionCASGuangzhou 510640China Department ofGeosciences Zhejiang UniversityHangzhou 310037China Guangzhou center for gas hydrate Research CASGuangzhou 510640China

After the detection of the 1,20,21-C29 long-chain triol in some sediments and freshwater pteridophytes, in this study a new homologous long-chain triol, 1,3,4-C27-29, is detected for the first time in the Site4B core sediment in the northern South China Sea. The hydroxyl location and length of the carbon chain of this newly discovered triol differ from those of 1,20,21-C29 triol. The test results of its molecular distribution and individual carbon isotope reveal that 1,3,4-C29triol has a good correlation with n-C26-30 even carbon-numbered long-chain fatty alcohols, with R2 （n=68） values of 0.905, 0.929 and 0.903, respectively, and its carbon isotope composition, at -32.3%o_1.9%o, is similar to that of rt-C26.30, at -29.13%o^0.87%o, -32.98%o^1.28%o, and -32.98%o^1.28%o. 1,3,4-C29 triol from the Site4B core sediment and terrigenous long-chain fatty alcohol （n-C26.34） show highly consistent distribution trends in the entire section; thus, the former could serve as a proxy indicator of the terrigenous input. Considering that the 1,20,21-C29 triol in previous research belongs to Azolla, which are fresh water pteridophytes, the 1,3,4-C27-29 triol identified in this study might have similar biogenetic derivation. Thus, determination of its biogenic area and growing environment could provide potential organic geochemical evidence supporting the terrigenous input and source in the northern South China Sea.

关键词： Long-chain triol Northern South China Sea Terrigenous input

Semi-clathrate hydrate based carbon dioxide capture and separation techniques

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Frontiers of Environmental Science & Engineering 2023年第12期17卷 1-29页

作者： Lijuan Gu Hailong Lu Beijing International center for gas hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China National Engineering Research center for gas hydrate Exploration and Development Guangzhou 511466China

CO_(2)is considered as the main contributor to global warming,and hydrate enclathration is an efficient way for carbon capture and separation(CCS).Semi-clathrate hydrate(SCH)is a type of clathrate hydrate capable of encaging CO_(2)molecules under mild temperature and pressure *** has numerous unique advantages,including high thermal stability,selective absorption of gas molecules with proper size and recyclable,making it a promising candidate for *** SCH based CCS technology is in the developing stage and great efforts have to be conducted to improve the performance that is determined by their thermodynamical and structural *** review summarizes and compares the thermodynamic and structural properties of SCH and quaternary salt hydrates with gas mixtures to be captured and *** on the description of the physical properties of SCH and hydrate of quaternary salts with gas mixture,the CO_(2)capture and separation from fuel gas,flue gas and biogas with SCH are *** review focuses on the use of tetra-nbutyl ammonium halide and tetra-n-butyl phosphonium halide,which are the current application *** review aims to provide guidance for the future applications of SCH.

关键词： Semi-clathrate hydrate Tetra-n-butyl ammonium halide Tetra-n-butyl phosphonium halide Structure Thermodynamical properties CO_(2) capture and separation

Research Progress on the Electrical Properties of gas hydrate-bearing Sediments

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 816-827页

作者： TAN Kui ZHANG Qi HE Tao Key Laboratory of Orogenic Belts and Crustal Evolution(Ministry of Education) School of Earth and Space SciencesPeking UniversityBeijing 100871China Beijing International center for gas hydrate Peking UniversityBeijing 100871China

Electrical properties are important physical parameters of natural gas hydrate,and,specifically,resistivity has been widely used in the quantitative estimation of hydrate *** are three main methods to study the electrical properties of gas hydrate-bearing sediments:experimental laboratory measurements,numerical simulation,and resistivity *** measurements can be divided into three categories:normal electrical measurement,complex resistivity measurement,and electrical resistivity *** measurements show that the resistivity of hydrate-bearing sediment is affected by many factors,and its distribution as well as the hydrate saturation is not uniform;there is a distinct non-Archie *** numerical method can simulate the resistivity of sediments by changing the hydrate occurrence state,saturation,distribution,***,it needs to be combined with X-ray CT,nuclear magnetic resonance,and other imaging techniques to characterize the porous characteristics of the hydrate-bearing *** well logging can easily identify hydrate layers based on their significantly higher resistivity than the background,but the field data of the hydrate layer also has a serious non-Archie ***,more experimental measurements and numerical simulation studies are needed to correct the parameters of Archie’s formula.

关键词： resource exploration gas hydrate resistivity hydrate saturation numerical simulation well logging Archie's formula

Numerical Study of gas Production from a Methane hydrate Reservoir Using Depressurization with Multi-wells

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 928-936页

作者： SHANG Shilong GU Lijuan LU Hailong College of Engineering Peking UniversityBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Beijing International center for gas hydrate Peking UniversityBeijing 100871China

With the implementation of the production tests in permafrost and offshore regions in Canada,US,Japan,and China,the study of natural gas hydrate has progressed into the stage of technology development for industrial *** depressurization method is considered as a better strategy to produce gas from hydrate reservoirs based on production tests and laboratory ***-well production is proposed to improve gas production efficiency,to meet the requirement for industrial *** evaluating the applicability of multi-well production to hydrate exploitation,a 2D model is established,with numerical simulations of the performance of the multi-well pattern carried *** understand the dissociation behavior of gas hydrate,the pressure and temperature distributions in the hydrate reservoir are specified,and the change in permeability of reservoir sediments is *** results obtained indicate that multi-well production can improve the well connectivity,accelerate hydrate dissociation,enhance gas production rate and reduce water production as compared with single-well production.

关键词： oil and gas upstream unconventional resources natural gas hydrate numerical simulation depressurization

Seismic monitoring of sub-seafloor fluid processes in the Haima cold seep area using an Ocean Bottom Seismometer (OBS)

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Earth and Planetary Physics 2023年第5期7卷 582-602页

作者： Bin Liu JianYu Huang WenBin Jiang WeiWei Wang Li Yang Guangzhou Marine Geological Survey Guangzhou 511458China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China National Engineering Research center for gas hydrate Exploration and Development Guangzhou 511458China

The use of ocean bottom seismometers provides an effective means of studying the process and the dynamic of cold seeps by continuously recording micro-events produced by sub-seafloor fluid *** deployed a four-component Ocean Bottom Seismometer(OBS)at an active site of the Haima cold seep from 6 November to 19 November in ***,we present the results of this short-term OBS *** first examine the OBS record manually to distinguish(by their distinctive seismographic signatures)four types of events:shipping noises,vibrations from our remotely operated vehicle(ROV)operations,local earthquakes,and short duration events(SDEs).Only the SDEs are further discussed in this *** SDEs are similar to those observed in other sea areas and are interpreted to be correlated with sub-seafloor fluid *** the OBS data collected during the 14-day monitoring *** identify five *** to the SDE occurrence rate observed in other cold seep regions,five events is rather low,from which it could be inferred that fluid migration,and subsequent gas seepage,is not very active at the Haima *** conclusion agrees with multi-beam and chemical observations at that *** observations thus provide further constraint on the seepage activity in this *** is the first time that cold seep-related SDEs have been identified in the South China Sea,expanding the list of sea areas where SDEs are now linked to cold seep fluid migration.

关键词： cold seep OBS(Ocean Bottom Seismometer) SDE(short duration event) Haima South China Sea