期刊文献+
共找到86篇文章
< 1 2 5 >
每页显示 20 50 100
Evaluation of the Shallow Gas Hydrate Production Based on the Radial Drilling-Heat Injection-Back Fill Method
1
作者 CHEN Qiang WAN Yizhao +6 位作者 WU Nengyou SUN Jianye WANG Jian LIU Changling LI Yanlong LI Chengfeng HU Gaowei 《Journal of Ocean University of China》 CAS CSCD 2024年第1期119-128,共10页
It has been evidenced that shallow gas hydrate resources are abundant in deep oceans worldwide.Their geological back-ground,occurrence,and other characteristics differ significantly from deep-seated hydrates.Because o... It has been evidenced that shallow gas hydrate resources are abundant in deep oceans worldwide.Their geological back-ground,occurrence,and other characteristics differ significantly from deep-seated hydrates.Because of the high risk of well construction and low production efficiency,they are difficult to be recovered by using conventional oil production methods.As a result,this paper proposes an alternative design based on a combination of radial drilling,heat injection,and backfilling methods.Multi-branch holes are used to penetrate shallow gas hydrate reservoirs to expand the depressurization area,and heat injection is utilized as a supplement to improve gas production.Geotechnical information collected from an investigation site close to the offshore production well in the South China Sea is used to assess the essential components of this plan,including well construction stability and gas production behavior.It demonstrates that the hydraulic fracturing of the 60mbsf overburden layer can be prevented by regulating the drilling fluid densities.However,the traditional well structure is unstable,and the suction anchor is advised for better mechanical performance.The gas produc-tion rate can be significantly increased by combining hot water injection and depressurization methods.Additionally,the suitable produc-tion equipment already in use is discussed. 展开更多
关键词 shallow gas hydrate trail production radial drilling-heat injection-back fill method experimental and numerical simulation
下载PDF
Microscopic study on the key process and influence of efficient synthesis of natural gas hydrate by in situ Raman analysis of water microstructure in different systems with temperature drop 被引量:2
2
作者 Wei Zhang Chun-Gang Xu +2 位作者 Xiao-Sen Li Zhuo-Yi Huang Zhao-Yang Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第7期317-333,I0008,共18页
Gas hydrate technology has considerable potential in many fields.However,due to the lack of understanding of the micro mechanism of hydrate formation,it has not been commercially applied so far.Gas hydrate formation i... Gas hydrate technology has considerable potential in many fields.However,due to the lack of understanding of the micro mechanism of hydrate formation,it has not been commercially applied so far.Gas hydrate formation is essentially a gas-liquid-solid phase transition of water and gas molecules at a certain temperature and pressure.The key to the hydrate formation is the transformation of water molecule from disordered arrangement to ordered arrangement.In this process,weakly hydrogen bonded water will be correspondingly converted to strongly hydrogen bonded water.Through in situ Raman analysis and experiments,the position change of the corresponding peaks of the strongly hydrogen bonded water and the weakly hydrogen bonded water was compared in this work,and the key microscopic process and influence of gas hydrate formation in different systems were comprehensively studied and summarized.It is found that,with the decrease of temperature,the OAH of the weakly hydrogen bonded water remains unchanged when the temperature drops to a certain value,which is the key to the transformation of water into cage hydrate rather than ice.The conversion from the weakly hydrogen bonded water to the strongly hydrogen bonded water is closely related to the gas-liquid interface force,the hydrophilicity/hydrophobicity of the promoter,the ionization degree of liquid,and the electrostatic field of the system.Among the four most common promoters,tetrahydrofuran(THF)has the highest efficiency in promoting methane(CH4)hydrate formation.Therefore,this study provides a scientific direction and basis for the development of high efficient hydrate formation promoters,which can effectively weaken the hydrogen bond of weakly hydrogen bonded water and promote the conversion of weakly hydrogen bonded water to strongly hydrogen bonded water. 展开更多
关键词 HYDRATE CONVERSION Hydrogen bonded water PROMOTER Micro mechanism
下载PDF
Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation 被引量:10
3
作者 X.H.Zhang D.S.Luo +2 位作者 X.B.Lu L.L.Liu C.L.Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第2期266-274,共9页
The changes in the mechanical properties of gas hydrate-bearing sediments(GHBS) induced by gas hydrate(GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies pre... The changes in the mechanical properties of gas hydrate-bearing sediments(GHBS) induced by gas hydrate(GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies present substantial mechanical data and constitutive models for GHBS at a given GH saturation under the non-dissociated condition. In this paper, GHBS was formed by the gas saturated method, GH was dissociated by depressurization until the GH saturation reached different dissociation degrees. The stress–strain curves were measured using triaxial tests at a same pore gas pressure and different confining pressures. The results show that the shear strength decreases progressively by 30%–90% of the initial value with GH dissociation, and the modulus decreases by 50% –75%. Simplified relationships for the modulus, cohesion, and internal friction angle with GH dissociated saturation were presented. 展开更多
关键词 Gas hydrate-bearing sediments DISSOCIATION Mechanical properties Shear strength Triaxial test
下载PDF
Study of the Surface Morphology of Gas Hydrate 被引量:13
4
作者 SUN Jianye LI Chengfeng +3 位作者 HAO Xiluo LIU Changling CHEN Qiang WANG Daigang 《Journal of Ocean University of China》 SCIE CAS CSCD 2020年第2期331-338,共8页
Study of the surface morphology of gas hydrate is of great importance in understanding its physical properties and occurrence.In order to investigate the surface morphology of different types(sI and sII)and occurrence... Study of the surface morphology of gas hydrate is of great importance in understanding its physical properties and occurrence.In order to investigate the surface morphology of different types(sI and sII)and occurrences(pore-filling and fracture-filling)of gas hydrate,both lab-synthesized and drilled-gas hydrate samples were measured using cryo-scanning electron microscopy(cryo-SEM).Results showed that the surface of s I hydrate was relatively smooth,and spongy nano-pores(200–400 nm)gradually occurred at the surface during continuous observation.The surface of sII hydrate was more compact,showing a tier-like structure.Hydrate occurred in quartz sand and usually filled the pores of the sediments and both hydrate and sediments were cemented with each other.SEM observation of the gas hydrates collected from the South China Sea showed that the surface morphology and contact relation with sediments varied with hydrate occurrence.For instance,hydrates dispersed in sediments mainly filled the pores of the sediments.The existence of microorganism shells,such as foraminifera,was beneficial to the formation of gas hydrate.When hydrate occurred as a massive or vein structure,it was easily distinguished from the surrounding sediments.The surface of hydrate with massive or vein structure showed two distinct characters:one was dense and smooth,the other is porous(several to tens of micrometers in diameter).The occurrence of different hydrate morphologies was probably caused by the supplement rates of methane gas. 展开更多
关键词 gas hydrate surface morphology CRYO-SEM grain contacts
下载PDF
Inhibitory effects of novel green inhibitors on gas hydrate formation 被引量:6
5
作者 Cuiping Tang Deqing Liang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第9期2107-2117,共11页
Natural gas hydrates easily form in pipelines,causing potential safety issues during oil and gas production and transportation.Injecting gas hydrate inhibitors is one of the most effective methods for preventing gas h... Natural gas hydrates easily form in pipelines,causing potential safety issues during oil and gas production and transportation.Injecting gas hydrate inhibitors is one of the most effective methods for preventing gas hydrate formation or aggregation.However,some thermodynamic hydrate inhibitors are toxic and harmful to the environment,whereas degradation of kinetic inhibitors is difficult.Therefore,environmentally friendly and easily biodegradable novel green inhibitors have been proposed and investigated.This paper provides a short but systematic review of the inhibitory performance of amino acids,antifreeze proteins,and ionic liquids.For different hydrate formation systems,the influences of the inhibitor type,structure,and concentration on the inhibitory effects are summarized.The mechanism of green inhibitors as kinetic inhibitors is also discussed.The progress described here will facilitate further developments of such green inhibitors for gas hydrate formation. 展开更多
关键词 Gas HYDRATE Inhibition Green INHIBITORS KINETIC INHIBITORS THERMODYNAMIC INHIBITORS
下载PDF
Effect of Methane Gas on Acoustic Characteristics of Hydrate-Bearing Sediment–Model Analysis and Experimental Verification 被引量:4
6
作者 BU Qingtao HU Gaowei +5 位作者 LIU Changling DONG Jie XING Tongju SUN Jianye LI Chengfeng MENG Qingguo 《Journal of Ocean University of China》 SCIE CAS CSCD 2021年第1期75-86,共12页
Gas leakage is an important consideration in natural systems that experience gas hydrate accumulation.A number of velocity models have been created to study hydrate-bearing sediments,including the BGTL theory,the weig... Gas leakage is an important consideration in natural systems that experience gas hydrate accumulation.A number of velocity models have been created to study hydrate-bearing sediments,including the BGTL theory,the weighted equation,the Wood equation,the K-T equation,and the effective medium theory.In previous work,we regarded water as the pore fluid,which meant its density and bulk modulus values were those of water.This approach ignores the presence of gas,which results in a biased calculation of the pore fluid's bulk modulus and density.To take into account the effect of gas on the elastic wave velocity,it is necessary to recalculate the bulk modulus and density of an equivalent medium.Thus,a high-pressure reactor device for simulating leakage systems was developed to establish the relationship between wave velocity and hydrate saturation in methane-flux mode.A comparison of the values calculated by the velocity model with the experimental data obtained in this study indicates that the effective medium theory(EMT,which considers gas effects)is more applicable than other models.For hydrate saturations of 10%–30%,the result ranges between EMT-B(homogenous gas distribution)and EMT-B(patchy gas distribution).For hydrate saturations of 30%–60%,the results are similar to those of the EMT-B(homogenous gas distribution)mode,whereas hydrate saturations of 60%–70%yield results similar to those of the EMT-A mode.For hydrate saturations greater than 80%,the experimental results are similar to those of the EMT-B mode.These results have significance for hydrate exploitation in the South China Sea. 展开更多
关键词 natural gas hydrate methane gas acoustic properties wave velocity model simulation experiment
下载PDF
Deformation Characteristics of Hydrate-Bearing Sediments
7
作者 DONG Lin LI Yanlong +4 位作者 ZHANG Yajuan HU Gaowei LIAO Hualin CHEN Qiang WU Nengyou 《Journal of Ocean University of China》 CAS CSCD 2024年第1期149-156,共8页
The safe and efficient development of natural gas hydrate requires a deep understanding of the deformation behaviors of reservoirs.In this study,a series of triaxial shearing tests are carried out to investigate the d... The safe and efficient development of natural gas hydrate requires a deep understanding of the deformation behaviors of reservoirs.In this study,a series of triaxial shearing tests are carried out to investigate the deformation properties of hydrate-bearing sediments.Variations of volumetric and lateral strains versus hydrate saturation are analyzed comprehensively.Results indicate that the sediments with high hydrate saturation show dilative behaviors,which lead to strain-softening characteristics during shearing.The volumetric strain curves have a tendency to transform gradually from dilatation to compression with the increase in effective confining pressure.An easy prediction model is proposed to describe the relationship between volumetric and axial strains.The model coefficientβis the key dominating factor for the shape of volumetric strain curves and can be determined by the hydrate saturation and stress state.Moreover,a modified model is established for the calculation of lateral strain.The corresponding determination method is provided for the easy estimation of model coefficients for medium sand sediments containing hydrate.This study provides a theoretical and experimental reference for deformation estimation in natural gas hydrate development. 展开更多
关键词 gas hydrate deformation characteristics volumetric strain lateral strain prediction model
下载PDF
Experimental Study on Consolidation Properties of Hydrate-Bearing Fine-Grained Sediments Collected from the Shenhu Area of the Northern South China Sea
8
作者 WEI Ruchun LIU Lele +5 位作者 JIA Chao DONG Xiao BU Qingtao ZHANG Yongchao LIU Changling WU Nengyou 《Journal of Ocean University of China》 SCIE CAS CSCD 2024年第4期981-990,共10页
Mechanical properties of hydrate-bearing fine-grained sediments are crucial to effectively mitigate environmental risks caused by artificial and natural decomposition of natural gas hydrates,and the decomposition can ... Mechanical properties of hydrate-bearing fine-grained sediments are crucial to effectively mitigate environmental risks caused by artificial and natural decomposition of natural gas hydrates,and the decomposition can induce laterally confined deformation.To explore the effect of natural gas hydrates on laterally confined compression properties,consolidation tests are conducted on remolded hydrate-free and hydrate-bearing samples by using natural fine-grained sediments collected from the northern South China Sea as the host sediments,and empirical equations are developed based on the analyses of consolidation characteristics.The results show that vertical loading induces a reduction in void ratio,and the reduction increases with decreasing hydrate saturation when samples are subjected to the same vertical stress change.The compression index of samples is about 0.53 whether there is hydrate or not,but the yield stress of samples increases sharply with increasing hydrate saturation once beyond the critical value.The coefficient of volume compression and the coefficient of consolidation of hydrate-bearing samples both increase firstly and then decrease to a relative stable level with increasing vertical stress,and the transition occurs at 200 kPa.The average consolidation degree with elapsed time increases rapidly under low vertical stresses,slowly under median vertical stresses,and under high vertical stresses,the consolidation increases a little faster but still slower than those under low vertical stresses. 展开更多
关键词 natural gas hydrate STIFFNESS compression index hydraulic permeability GEOHAZARD
下载PDF
Application of fracturing technology to increase gas production in low-permeability hydrate reservoir:A numerical study 被引量:3
9
作者 Peng-Fei Shen Gang Li +2 位作者 Xiao-Sen Li Bo Li Jin-Ming Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第6期267-277,共11页
Low temperature and low permeability are the challenges for the development of hydrate reservoirs in permafrost.The ice produced around the production well caused by high depressurization driving force reduces the gas... Low temperature and low permeability are the challenges for the development of hydrate reservoirs in permafrost.The ice produced around the production well caused by high depressurization driving force reduces the gas production,and it is necessary to reduce the effect of ice production on gas production.In this work,a new combination of fracturing technology and depressurization method was proposed to evaluate the gas production potential at the site DK-2 in Qinghai-Tibet Plateau Permafrost.A relatively higher intrinsic permeability of the fracture zone surround the horizontal production well was created by the fracturing technology.The simulation results showed that the fracture zone reduced the blocking of production ice to production wells and promoted the propagation of production pressure.And the gas production increased by 2.1 times as the radius of the fracture zone increased from 0 to 4 m in 30 years.Nearly half of the hydrate reservoirs were dissociated in 30 years,and greater than 51.7%of the gas production was produced during the first 10 years.Moreover,production behaviours were sensitive to the depressurization driving force but not to the thermal conductivity.The growth of gas production was not obvious with the intrinsic permeability of the fracture zone higher than 100 m D.The effect of ice production on gas production by fracturing technology and depressurization method was limited. 展开更多
关键词 Gas hydrates Fracturing technology DEPRESSURIZATION Low-permeability PERMAFROST
下载PDF
Microstructure Features and the Macroscopic Acoustic Behavior of Gassy Silt in the Yellow River Delta
10
作者 LIU Tao GUO Zhenqi +3 位作者 ZHANG Yan WU Chen LIU Lele DENG Shenggui 《Journal of Ocean University of China》 CAS CSCD 2024年第2期371-382,共12页
The morphological changes in isolated bubbles in gassy silt play a critical role in the microscopic structures between soil particles and bubbles and macroscopic physical properties.Based on X-ray CT scanning experime... The morphological changes in isolated bubbles in gassy silt play a critical role in the microscopic structures between soil particles and bubbles and macroscopic physical properties.Based on X-ray CT scanning experiments under various vertical loads(four levels),self-designed acoustic macro experiments,and a series of formula revisions to the macro-air-bearing silt sound-velocity prediction model,this paper discusses the macro-and micro-scale features of gassy silts from the Yellow River Delta.The samples consisted of different proportions of silt from the Yellow River Delta and porous media,and they were used to form two types of aerosol silts with initial gas contents of 4.23%and 7.67%.The results show that the air bubble content and external load considerably affect the microstructural parameters and acoustic behavior of gassy silt in the Yellow River Delta.The macroscopic sound velocity showed a linear positive correlation with vertical load and relation to microstructural parameters in varying manners and degrees.Based on the traditional Biot-Stoll acoustic model,the gas-phase medium coefficient was introduced for the proper calculation and prediction of the sound velocity of air-bearing silt.The errors of the overall prediction varied between 5.6%and 9.6%. 展开更多
关键词 gassy silt vertical load microstructure parameters bubble vibration Biot-Stoll acoustic model
下载PDF
Investigation of the hydrate formation process in fine sediments by a binary CO2/N2 gas mixture 被引量:2
11
作者 Xiaoya Zang Lihua Wan Deqing Liang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第9期2157-2163,共7页
To obtain the fundamental data of CO2/N2 gas mixture hydrate formation kinetics and CO2 separation and sequestration mechanisms,the gas hydrate formation process by a binary CO2/N2 gas mixture(50:50)in fine sediments(... To obtain the fundamental data of CO2/N2 gas mixture hydrate formation kinetics and CO2 separation and sequestration mechanisms,the gas hydrate formation process by a binary CO2/N2 gas mixture(50:50)in fine sediments(150–250μm)was investigated in a semibatch vessel at variable temperatures(273,275,and 277 K)and pressures(5.8–7.8 MPa).During the gas hydrate reaction process,the changes in the gaseous phase composition were determined by gas chromatography.The results indicate that the gas hydrate formation process of the binary CO2/N2 gas mixture in fine sediments can be reduced to two stages.Firstly,the dissolved gas containing a large amount of CO2 formed gas hydrates,and then gaseous N2 participated in the gas hydrate formation.In the second stage,all the dissolved gas was consumed.Thus,both gaseous CO2 and N2 diffused into sediment.The first stage in different experiments lasted for 5–15 h,and>60%of the gas was consumed in this period.The gas consumption rate was greater in the first stage than in the second stage.After the completion of gas hydrate formation,the CO2 content in the gas hydrate was more than that in the gas phase.This indicates that CO2 formed hydrate easily than N2 in the binary mixture.Higher operating pressures and lower temperatures increased the gas consumption rate of the binary gas mixture in gas hydrate formation. 展开更多
关键词 GAS HYDRATE FORMATION SEDIMENTS CO2/N2 MIXTURE
下载PDF
Microstructure Characterization of Bubbles in Gassy Soil Based on the Fractal Theory
12
作者 WU Chen LIN Guoqing +3 位作者 LIU Lele LIU Tao LI Chengfeng GUO Zhenqi 《Journal of Ocean University of China》 CAS CSCD 2024年第1期129-137,共9页
The microscopic characterization of isolated bubbles in gassy soil plays an important role in the macroscopic physical properties of sediments and is a key factor in the study of geological hazards in gas-bearing stra... The microscopic characterization of isolated bubbles in gassy soil plays an important role in the macroscopic physical properties of sediments and is a key factor in the study of geological hazards in gas-bearing strata.Based on the box-counting method and the pore fractal features in porous media,a fractal model of bubble microstructure parameters in gassy soil under different gas con-tents and vertical load conditions is established by using an industrial X-ray CT scanning system.The results show that the fractal di-mension of bubbles in the sample is correlated with the volume fraction of bubbles,and it is also restricted by the vertical load.The three-dimensional fractal dimension of the sample is about 1 larger than the average two-dimensional fractal dimension of all the slices from the same sample.The uniform porous media fractal model is used to test the equivalent diameter,and the results show that the variation of the measured pore diameter ratio is jointly restricted by the volume fraction and the vertical load.In addition,the measured self-similarity interval of the bubble area distribution is tested by the porous media fractal capillary bundle model,and the fitting curve of measured pore area ratio in a small loading range is obtained in this paper. 展开更多
关键词 gassy soil bubble microstructure parameters fractal dimension vertical load
下载PDF
Thermal recovery method of submarine gas hydrate based on a thermoelectric generator 被引量:2
13
作者 Cui-ling Xu Zhi-lei Sun +5 位作者 Wei Geng Xian-rong Zhang Hong Cao Li-ping Liu Xi-lin Zhang Bin Zhai 《China Geology》 2018年第4期568-569,共2页
1.Objective Natural gas hydrates are considered as a potential alternative fuel resource to petroleum and gas (Chong ZR et al.,2016),which can be exploited by means of depressurization,thermal method,inhibitor injecti... 1.Objective Natural gas hydrates are considered as a potential alternative fuel resource to petroleum and gas (Chong ZR et al.,2016),which can be exploited by means of depressurization,thermal method,inhibitor injection,etc.For the thermal method,gas hydrates are decomposed into water and methane when the reservoir is heated to above the equilibrium temperature of gas hydrate (Li X et al.,2016). However,the thermal recovery method needs a great deal of heat,and thus the feasibility of economic exploitation is reduced. 展开更多
关键词 NATURAL gas HYDRATES ALTERNATIVE fuel RESOURCE INHIBITOR INJECTION
下载PDF
Growth behavior and resource potential evaluation of gas hydrate in core fractures in Qilian Mountain permafrost area, Qinghai-Tibet Plateau 被引量:1
14
作者 Qing-guo Meng Chang-ling Liu +5 位作者 Zhen-quan Lu Xi-luo Hao Cheng-feng Li Qing-tao Bu Yun-kai Ji Jia-xian Wang 《China Geology》 CAS CSCD 2023年第2期208-215,共8页
The Qilian Mountain permafrost area located in the northern of Qinghai-Tibet Plateau is a favorable place for natural gas hydrate formation and enrichment,due to its well-developed fractures and abundant gas sources.U... The Qilian Mountain permafrost area located in the northern of Qinghai-Tibet Plateau is a favorable place for natural gas hydrate formation and enrichment,due to its well-developed fractures and abundant gas sources.Understanding the formation and distribution of multi-component gas hydrates in fractures is crucial in accurately evaluating the hydrate reservoir resources in this area.The hydrate formation experiments were carried out using the core samples drilled from hydrate-bearing sediments in Qilian Mountain permafrost area and the multi-component gas with similar composition to natural gas hydrates in Qilian Mountain permafrost area.The formation and distribution characteristics of multi-component gas hydrates in core samples were observed in situ by X-ray Computed Tomography(X-CT)under high pressure and low temperature conditions.Results show that hydrates are mainly formed and distributed in the fractures with good connectivity.The ratios of volume of hydrates formed in fractures to the volume of fractures are about 96.8%and 60.67%in two different core samples.This indicates that the fracture surface may act as a favorable reaction site for hydrate formation in core samples.Based on the field geological data and the experimental results,it is preliminarily estimated that the inventory of methane stored in the fractured gas hydrate in Qilian Mountain permafrost area is about 8.67×1013 m3,with a resource abundance of 8.67×108 m3/km2.This study demonstrates the great resource potential of fractured gas hydrate and also provides a new way to further understand the prospect of natural gas hydrate and other oil and gas resources in Qilian Mountain permafrost area. 展开更多
关键词 Gas hydrate Growth behavior Core fracture Rock Quality Designation Resource potential evaluation Engineering Oil and gas exploration Qilian Mountain permafrost area Qinghai-Tibet Plateau
下载PDF
Advances of experimental study on gas production from synthetic hydrate reservoir in China 被引量:1
15
作者 Jingchun Feng Longtao Sun +1 位作者 Yi Wang Xiaosen Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第9期2213-2225,共13页
China has entered the area of new normal economy which requires the harmonious development of energy consumption,environmental protection and economic development.Natural gas hydrate is a potential clean energy with t... China has entered the area of new normal economy which requires the harmonious development of energy consumption,environmental protection and economic development.Natural gas hydrate is a potential clean energy with tremendous reserve in China.The successful field test of marine hydrate exploitation in South China Sea created a new record of the longest continuous gas production from natural gas hydrate.However,the corresponding fundamental research is still urgently needed in order to narrow the gap between field test and commercial production.This paper reviewed the latest advances of experimental study on gas production from hydrate reservoir in China.The experimental apparatus for investigating the performance of hydrate dissociation in China has developed from one dimensional to two dimensional and three dimensional.In addition,well configuration developed from one tube to complicated multi-well networks to satisfy the demand of different production models.Besides,diverse testing methods have been established.The reviewed papers preliminary discussed the mechanical properties and the sediment deformation situation during the process of hydrate dissociation.However,most reported articles only consider the physical factor,the coupled mechanism of physical and chemical factor for the mechanical properties of the sediment and the sand production problem should be studied further. 展开更多
关键词 Natural GAS HYDRATE Experimental investigation GAS production EXPLOITATION technology SEDIMENT deformation
下载PDF
A three-dimensional environmental monitoring system for the production of marine gas hydrates 被引量:2
16
作者 Zhi-lei Sun Hong Cao +5 位作者 Wei Geng Le Zhang Xian-rong Zhang Cui-ling Xu Xin Li Jian-wei Guo 《China Geology》 2018年第4期570-571,共2页
1.Objectives As about 99% of the natural gas hydrate (NGH)resources are stored on the seafloor,it is inevitable that in its process of exploration and production,there will be geohazards such as methane leakage,seabed... 1.Objectives As about 99% of the natural gas hydrate (NGH)resources are stored on the seafloor,it is inevitable that in its process of exploration and production,there will be geohazards such as methane leakage,seabed subsidence,ecosystem damage and even landslide.Therefore,a set of integrated systems for environmental monitoring in the process of NGH production has been proposed in the consideration of environmental disasters that may arise in the process of hydrate production. 展开更多
关键词 THREE-DIMENSIONAL MONITORING SYSTEM HYDRATES
下载PDF
Identification of Re-Deposited Sediments and the Relationships with Heterogeneous Distributions of Gas Hydrates in the Shenhu Area 被引量:2
17
作者 SU Ming SHA Zhibin +4 位作者 QIAO Shaohua LIANG Jinqiang LIU Jie YANG Rui WU Nengyou 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第A01期270-272,共3页
The first marine gas hydrate drilling expedition (GMGS-1) of China was performed in the Shenhu Area, northern slope of the South China Sea (Fig. la) by Guangzhou Marine Geological Survey (GMGS) during April to J... The first marine gas hydrate drilling expedition (GMGS-1) of China was performed in the Shenhu Area, northern slope of the South China Sea (Fig. la) by Guangzhou Marine Geological Survey (GMGS) during April to June, 2007, to detect the occurrences of gas hydrates. The drilling results showed that the distributions of hydrates in the drilling area were heterogeneous. 展开更多
下载PDF
Re-examination on The Contribution of Deep Thermogenic Gas to Shallow Hydrate in The Shenhu Area,Northern Continental Slope of South China Sea 被引量:1
18
作者 CONG Xiaorong QIAO Shaohua +2 位作者 WU Nengyou YANG Rui SU Pibo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第A01期467-468,共2页
1 Introduction In April-June of 2007, the Expedition GMGS-1 was completed successfully in the Shenhu Area of the South China Sea. Gas hydrate was detected at three (Sites SH2, SH3 and SH7) of the five sites that wer... 1 Introduction In April-June of 2007, the Expedition GMGS-1 was completed successfully in the Shenhu Area of the South China Sea. Gas hydrate was detected at three (Sites SH2, SH3 and SH7) of the five sites that were cored. The Shenhu gas hydrate drilling area is located in the central Baiyun sag. 展开更多
下载PDF
Application of frequency division inversion in the prediction of heterogeneous natural gas hydrates reservoirs in the Shenhu Area,South China Sea
19
作者 Shu-yu Wu Jun Liu +5 位作者 Hua-ning Xu Chang-ling Liu Fu-long Ning Hong-xian Chu Hao-ran Wu Kai Wang 《China Geology》 2022年第2期251-266,共16页
Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this area.In th... Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this area.In the case that free gas exists beneath hydrate deposits,the frequency of the hydrate deposits will be noticeably attenuated,with the attenuation degree mainly affected by pore development and free gas content.Therefore,the frequency can be used as an important attribute to identify hydrate reservoirs.Based on the time-frequency characteristics of deposits,this study predicted the spatial distribution of hydrates in this area using the frequency division inversion method as follows.Firstly,the support vector machine(SVM)method was employed to study the amplitude versus frequency(AVF)response based on seismic and well logging data.Afterward,the AVF response was introduced as independent information to establish the nonlinear relationship between logging data and seismic waveform.Then,the full frequency band information of the seismic data was fully utilized to obtain the results of frequency division inversion.The inversion results can effectively broaden the frequency band,reflect the NGHs distribution,and reveal the NGHs reservoirs of two types,namely the fluid migration pathway type and the in situ self-generation self-storage diffusion type.Moreover,the inversion results well coincide with the drilling results.Therefore,it is feasible to use the frequency division inversion to predict the spatial distribution of heterogeneous NGHs reservoirs,which facilitates the optimization of favorable drilling targets and is crucial to the resource potential assessment of NGHs. 展开更多
关键词 Gas hydrates HETEROGENEITY Frequency division inversion Self-generation and self-storage diffusion type NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea
下载PDF
Mechanical Properties of Methane Hydrate-Bearing Interlayered Sediments 被引量:16
20
作者 DONG Lin LI Yanlong +5 位作者 LIU Changling LIAO Hualin CHEN Guoqi CHEN Qiang LIU Lele HU Gaowei 《Journal of Ocean University of China》 SCIE CAS CSCD 2019年第6期1344-1350,共7页
The complex distribution of gas hydrate in sediments makes understanding the mechanical properties of hydrate-bearing sediments a challenging task.The mechanical behaviors of hydrate-bearing interlayered sediments are... The complex distribution of gas hydrate in sediments makes understanding the mechanical properties of hydrate-bearing sediments a challenging task.The mechanical behaviors of hydrate-bearing interlayered sediments are still poorly known.A series of triaxial shearing tests were conducted to investigate the strength parameters and deformation properties of methane hydrate-bearing interlayered sediments at the effective pressure of 1 MPa.The results indicate that the stress-strain curves of hydrate-bearing interlayered sediments are significantly different from that of hydrate-bearing sediments.The peak strength,Young's modulus,initial yielding modulus,and failure mode are deeply affected by the methane hydrate distribution.The failure behaviors and mechanism of strain softening and hardening patterns of the interlayered specimens are more complicated than those of the integrated specimens.This study compares the different mechanical behaviors between integrated and interlayered specimens containing gas hydrate,which can serve as a reference for the prediction and analysis of the deformation behaviors of natural gas hydrate reservoirs. 展开更多
关键词 gas HYDRATE interlayered SEDIMENTS MECHANICAL property TRIAXIAL SHEARING tests strength parameters
下载PDF
上一页 1 2 5 下一页 到第
使用帮助 返回顶部