Triple mass-transport deposits （MTDs） with areas of 625, 494 and 902 km^2, respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic...Triple mass-transport deposits （MTDs） with areas of 625, 494 and 902 km^2, respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic reflection data and multi-beam bathymetric data, the Quaternary MTDs are characterized by typical geometric shapes and internal structures. Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°. The head wall scarps of the MTDs arrived to 50 km in length （from headwall to termination）. Their inner structures include well developed basal shear surface, growth faults, stepping lateral scarps, erosion grooves, and frontal thrust deformation. From seismic images, the central deepwater channel system of the Xisha Trough has been filled by interbedded channel-levee deposits and thick MTDs. Therefore, we inferred that the MTDs in the deepwater channel system could be dominated by far-travelled slope failure deposits even though there are local collapses of the trough walls. And then, we drew the two-dimensional process model and three- dimensional structure model diagram af the MTDs. Combined with the regional geological setting and previous studies, we discussed the trigger mechanisms of the triple MTDs.展开更多
The deposition of Asian dust aerosols during their trans-Pacific transport might cause significant marine phytoplankton biomass increases. However, the knowledge of the trans-Pacific dust transport, deposition, and sp...The deposition of Asian dust aerosols during their trans-Pacific transport might cause significant marine phytoplankton biomass increases. However, the knowledge of the trans-Pacific dust transport, deposition, and spatial distribution is still poor due to a lack of continuous and simultaneous observations in the Asian subcontinent, the north Pacific Ocean, and North America. The severe Asian dust storm during 6 to 9 April 2001 provided an opportunity to gain a better understanding of trans-Pacific dust transport and deposition, using a comprehensive set of observations from satellites, ground-based light detection and ranging, aircraft, and surface observation networks. The observations and model simulations outline the general pattern of dust transport, deposition, vertical profile, and spatial distribution. The following points were observed： （1） the surface dust concentrations decreased exponentially with the increasing dust transport distance from 80°E to 120°W along the transport pathway; （2） the altitude of the dust concentration peak increased with increasing transport distance in the north Pacific region; and （3） the spatial distribution of dust deposition mainly depended on the trans-Pacific transport route.展开更多
Nanoparticle transport and deposition in bends with circular cross-section are solved for different Reynolds numbers and Schmidt numbers. The perturbation method is used in solving the equations. The results show that...Nanoparticle transport and deposition in bends with circular cross-section are solved for different Reynolds numbers and Schmidt numbers. The perturbation method is used in solving the equations. The results show that the particle transport patterns are similar and independent of the particle size and other parameters when suspended nanoparticles flow in a straight tube. At the outside edge, particle deposition is the most intensive, while deposition at the inside edge is the weakest. In the upper and lower parts of the tube, depositions are approximately the same for different Schmidt numbers. Curvatures of tube, Reynolds number, and Schmidt number have second-order, forth-order, and first-order effects on the relative deposition efficiency, respectively.展开更多
About φ45 mm LiAlO2 single crystal was grown by Czochralski （Cz） technique. However, the full-width at half-maximum （FWHM） value was high to 116.9 arcsec. After three vapor transport equilibration （VTE） process...About φ45 mm LiAlO2 single crystal was grown by Czochralski （Cz） technique. However, the full-width at half-maximum （FWHM） value was high to 116.9 arcsec. After three vapor transport equilibration （VTE） processes, we can obtain high-quality LiAlO2 slice with the FWHM value of 44.2 arcsec. ZnO films were fabricated on as-grown slices and after-VTE ones by pulsed laser deposition （PLD）. It was found that ZnO films on the two slices have similar crystallinity, optical transmittance and optical band gap at room temperature. These results not only show that LAO substrate is suitable for ZnO growth, but also prove that the crystal quality of LAO substrate slightly affects the structural and optical properties of ZnO film.展开更多
Calculations based on the available thermodynamic data of AuCl2^- and Au(HS)2^- indicate that AuCl2^- is responsible for the transport and enrichment of gold during the stage of pre-concentration in the source bed whi...Calculations based on the available thermodynamic data of AuCl2^- and Au(HS)2^- indicate that AuCl2^- is responsible for the transport and enrichment of gold during the stage of pre-concentration in the source bed while Au(HS)2^- is the main gold species involved in the formation of gold deposits in response to hydrothermal reworking .Acid chloride solutions with αcl^->10° and sulfur-rich solutions with a∑s in excess of 10^-2 are held as important criteria for gold enrichment in the source bed and for the formation of gold deposits by subsequent hydrothermal event, respectively.展开更多
In this paper we focus on diamond film hot-filament chemical vapor deposition reactors where the only reactant is hydrogen so as to study the formation and transport of hydrogen atoms. Analysis of dimensionless number...In this paper we focus on diamond film hot-filament chemical vapor deposition reactors where the only reactant is hydrogen so as to study the formation and transport of hydrogen atoms. Analysis of dimensionless numbers for heat and mass transfer reveals that thermal conduction and diffusion are the dominant mechanisms for gas-phase heat and mass transfer, respectively. A simplified model has been established to simulate gas-phase temperature and H concentration distributions between the filament and the substrate. Examination of the relative importance of homogeneous and heterogeneous production of H atoms indicates that filament-surface decomposition of molecular hydrogen is the dominant source of H and gas-phase reaction plays a negligible role. The filament-surface dissociation rates of H2 for various filament temperatures were calculated to match H-atom concentrations observed in the literature or derived from power consumption by filaments. Arrhenius plots of the filament-surface hydrogen dissociation rates suggest that dissociation of H2 at refractory filament surface is a catalytic process, which has a rather lower effective activation energy than homogeneous thermal dissociation. Atomic hydrogen, acting as an important heat transfer medium to heat the substrate, can freely diffuse from the filament to the substrate without recombination.展开更多
颗粒调剖堵水是提高原油采收率的重要途径。了解颗粒在多孔介质中的运移沉积特性,便于颗粒制备的优化,提高颗粒与地层孔喉配伍性和封堵效率。综述了颗粒浓度值、粒径、多孔介质结构、粒径比、介质内流体参数等因素对运移沉积的影响,总...颗粒调剖堵水是提高原油采收率的重要途径。了解颗粒在多孔介质中的运移沉积特性,便于颗粒制备的优化,提高颗粒与地层孔喉配伍性和封堵效率。综述了颗粒浓度值、粒径、多孔介质结构、粒径比、介质内流体参数等因素对运移沉积的影响,总结了简化几何、介观模拟、LB-DEM(lattice Boltzmann method-discrete element method)、CFD-DEM(computational fluid dynamics-discrete element method)等模拟方法研究结果。分析表明,粒径比的临界值影响多孔介质的沉积位置和堵塞程度,粒径不同、所受力差异较大,大颗粒受水动力、重力、流体流速影响显著。多孔介质内流体流动模型尚未完全统一,Brinkman-Forchheimer-Darcy模型适用性较强,CFD-DEM方法从微观角度对介质内运移沉积流固耦合进行了验证,为非均质储层的调剖方案提供了依据。展开更多
块体搬运沉积(mass transport deposits,MTDs)是目前海洋研究方面的热点,而块体搬运沉积内部具有什么样的形态特征依然不够明确。该文基于琼东南盆地陵水凹陷高精度三维地震资料,描述了陵水凹陷L区块体搬运沉积三维地震构型,研究了盆地...块体搬运沉积(mass transport deposits,MTDs)是目前海洋研究方面的热点,而块体搬运沉积内部具有什么样的形态特征依然不够明确。该文基于琼东南盆地陵水凹陷高精度三维地震资料,描述了陵水凹陷L区块体搬运沉积三维地震构型,研究了盆地内深水沉积物内部结构、特征及形成机制,识别了侵蚀擦痕、逆冲推覆构造、挤压脊、水道等构造特征,并结合剖面、平面特征推测其成因及其分布规律,探讨了MTDs形成的特殊构造,并提出了三个假设:在流动开始之前已存在,并在层内被动运输;在流动运动中形成;在流动停滞期间形成。MTDs沉积层内部致密,鲜有贯穿性构造,是油气储集中良好的盖层。展开更多
A PIC （particle-in-cell）-MC （Monte Carlo） code to model electron beam transport into dense matter is developed. The background target is treated as a cold, stationary fluid and the fast electrons as particles with...A PIC （particle-in-cell）-MC （Monte Carlo） code to model electron beam transport into dense matter is developed. The background target is treated as a cold, stationary fluid and the fast electrons as particles with the relativistic motions. The process is described by a particle-in-cell method with consideration of the influence of both the self-generated electric and magnetic fields as well as collisions between the fast electrons and the target. The collisional part of the code is solved by the Monte Carlo-type method. Furthermore by assuming that the background current balances with the fast electron current, the electric field is given by the Ohm＇s law and the magnetic field is calculated from the Faraday＇s law. Both are solved in a two-dimensional cylindrical geometry. The algorithms implemented in the code are demonstrated and the numerical experiments are performed for monoenergy homogeneous fast electron beam transport in an aluminum target when the fields, collision and angular scattering are switched on and off independently.展开更多
We have developed a three dimensional （3D） PIC （particle-in-cell）-MC （Monte Carlo） code in order to simulate an electron beam transported into the dense matter based on our previous two dimensional code. The rel...We have developed a three dimensional （3D） PIC （particle-in-cell）-MC （Monte Carlo） code in order to simulate an electron beam transported into the dense matter based on our previous two dimensional code. The relativistic motion of fast electrons is treated by the particle-in-cell method under the influence of both a self-generated transverse magnetic field and an axial electric field, as well as collisions. The electric field generated by return current is expressed by Ohm＇s law and the magnetic field is calculated from Faraday＇s law. The slowing down of monoenergy electrons in DT plasma is calculated and discussed.展开更多
A 3D Monte Carlo （MC） code PIC- EDDY, based on EDDY （erosion and deposition dynamic simulation） code, was used to investigate the redeposition of different impurities in the gaps of C tiles. By incorporating the r...A 3D Monte Carlo （MC） code PIC- EDDY, based on EDDY （erosion and deposition dynamic simulation） code, was used to investigate the redeposition of different impurities in the gaps of C tiles. By incorporating the rate coefficients of beryllium （Be） and tungsten （W） into the code, we obtain deposition profiles of hydrocarbon, beryllium and tungsten particles in the toroidal and poloidal gaps, respectively. The redeposition rate of tungsten was found to be higher than those of other impurities in the gaps, except at the bottom, due to its easier local deposition within one gyroradius. Due to the effect of reflection coefficients of hydrocarbon fragments on graphite, fewer hydrocarbons were resided at the entrance while more were deposited on the sides of the gap. At elevated plasma temperatures （such as 30 eV）, asymmetric deposition distributions were observed between the toroidal and poloidal gaps due to the dominant ionized particles. Ions were mainly deposited within 1 mm depth inside gaps, and the bottom deposition particles were almost all neutrals.展开更多
A two-dimensional hybrid code is developed to model the transport of a high-current electron beam in a dense plasma target. The beam electrons are treated as particles and described by particle-in-cell simulation incl...A two-dimensional hybrid code is developed to model the transport of a high-current electron beam in a dense plasma target. The beam electrons are treated as particles and described by particle-in-cell simulation including collisions with the target plasma particles. The background target plasma is assumed to be a stationary fluid with temperature variations. The return current and the self-generated electric and magnetic fields are obtained by combining Amp^re＇s law without the displacement current, the resistive Ohm＇s law and Faraday＇s law. The equations are solved in two-dimensional cylindrical geometry with rotational symmetry on a regular grid, with centered spatial differencing and first-order implicit time differencing. The algorithms implemented in the code are described, and a numerical experiment is performed for an electron beam with Maxwellian distribution ejected into a uniform deuterium-tritium plasma target.展开更多
块体搬运沉积(mass transport deposits,MTDs)作为深水沉积体系的重要组成在资源勘探和地质灾害等方面具有重要意义。琼东南盆地深水区水合物钻探发现水合物层之上发育三套MTDs,目前对其沉积特征以及控制因素等研究不足,进而限制了其对...块体搬运沉积(mass transport deposits,MTDs)作为深水沉积体系的重要组成在资源勘探和地质灾害等方面具有重要意义。琼东南盆地深水区水合物钻探发现水合物层之上发育三套MTDs,目前对其沉积特征以及控制因素等研究不足,进而限制了其对下伏水合物藏影响的认识。本研究以紧邻水合物层的第三套块体搬运沉积(MTD3)为重点研究对象,综合利用2D/3D地震数据、测井及岩芯资料对MTD3的沉积特征进行研究,并探讨了MTD3的物质来源、控制因素以及对下伏水合物藏的影响。研究表明,MTD3的岩性主要为具有明显的变形特征的泥质沉积,在测井上表现为低伽马值和低电阻率以及不规则成像特征,在地震剖面上表现为与顶底连续性较好的强振幅反射有明显的差别低幅杂乱或空白反射;MTD3在琼东南盆地发育体部滑移区和趾部挤压区,未见头部拉张区,平面上呈条带状展布,面积约3600 km2。MTD3的沉积物质可能来源于琼东南盆地西北部陆坡,然后沿中央坳陷带自SW向NE运移。MTD3的发育受海底地形地貌、构造和地震活动、沉积速率以及海平面变化等因素的综合控制。位于趾部挤压区的MTD3与半远洋沉积共同构成下伏水合物的盖层,其致密岩性以及浅层超压共同促使水合物的富集成藏。本研究加深了对琼东南盆地第四纪浅层事件性沉积的认识,并为与块体搬运沉积相关的水合物资源预测提供地质理论指导。展开更多
基金The National Natural Science Foundation of China under contract Nos 41306057 and 40906028the Open Fund of the Key Laboratory of Submarine Geosciences,State Oceanic Administration under contract No.KLSG1406
文摘Triple mass-transport deposits （MTDs） with areas of 625, 494 and 902 km^2, respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic reflection data and multi-beam bathymetric data, the Quaternary MTDs are characterized by typical geometric shapes and internal structures. Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°. The head wall scarps of the MTDs arrived to 50 km in length （from headwall to termination）. Their inner structures include well developed basal shear surface, growth faults, stepping lateral scarps, erosion grooves, and frontal thrust deformation. From seismic images, the central deepwater channel system of the Xisha Trough has been filled by interbedded channel-levee deposits and thick MTDs. Therefore, we inferred that the MTDs in the deepwater channel system could be dominated by far-travelled slope failure deposits even though there are local collapses of the trough walls. And then, we drew the two-dimensional process model and three- dimensional structure model diagram af the MTDs. Combined with the regional geological setting and previous studies, we discussed the trigger mechanisms of the triple MTDs.
文摘The deposition of Asian dust aerosols during their trans-Pacific transport might cause significant marine phytoplankton biomass increases. However, the knowledge of the trans-Pacific dust transport, deposition, and spatial distribution is still poor due to a lack of continuous and simultaneous observations in the Asian subcontinent, the north Pacific Ocean, and North America. The severe Asian dust storm during 6 to 9 April 2001 provided an opportunity to gain a better understanding of trans-Pacific dust transport and deposition, using a comprehensive set of observations from satellites, ground-based light detection and ranging, aircraft, and surface observation networks. The observations and model simulations outline the general pattern of dust transport, deposition, vertical profile, and spatial distribution. The following points were observed： （1） the surface dust concentrations decreased exponentially with the increasing dust transport distance from 80°E to 120°W along the transport pathway; （2） the altitude of the dust concentration peak increased with increasing transport distance in the north Pacific region; and （3） the spatial distribution of dust deposition mainly depended on the trans-Pacific transport route.
基金supported by the National Natural Science Foundation of China (No. 10632070)
文摘Nanoparticle transport and deposition in bends with circular cross-section are solved for different Reynolds numbers and Schmidt numbers. The perturbation method is used in solving the equations. The results show that the particle transport patterns are similar and independent of the particle size and other parameters when suspended nanoparticles flow in a straight tube. At the outside edge, particle deposition is the most intensive, while deposition at the inside edge is the weakest. In the upper and lower parts of the tube, depositions are approximately the same for different Schmidt numbers. Curvatures of tube, Reynolds number, and Schmidt number have second-order, forth-order, and first-order effects on the relative deposition efficiency, respectively.
文摘About φ45 mm LiAlO2 single crystal was grown by Czochralski （Cz） technique. However, the full-width at half-maximum （FWHM） value was high to 116.9 arcsec. After three vapor transport equilibration （VTE） processes, we can obtain high-quality LiAlO2 slice with the FWHM value of 44.2 arcsec. ZnO films were fabricated on as-grown slices and after-VTE ones by pulsed laser deposition （PLD）. It was found that ZnO films on the two slices have similar crystallinity, optical transmittance and optical band gap at room temperature. These results not only show that LAO substrate is suitable for ZnO growth, but also prove that the crystal quality of LAO substrate slightly affects the structural and optical properties of ZnO film.
文摘Calculations based on the available thermodynamic data of AuCl2^- and Au(HS)2^- indicate that AuCl2^- is responsible for the transport and enrichment of gold during the stage of pre-concentration in the source bed while Au(HS)2^- is the main gold species involved in the formation of gold deposits in response to hydrothermal reworking .Acid chloride solutions with αcl^->10° and sulfur-rich solutions with a∑s in excess of 10^-2 are held as important criteria for gold enrichment in the source bed and for the formation of gold deposits by subsequent hydrothermal event, respectively.
文摘In this paper we focus on diamond film hot-filament chemical vapor deposition reactors where the only reactant is hydrogen so as to study the formation and transport of hydrogen atoms. Analysis of dimensionless numbers for heat and mass transfer reveals that thermal conduction and diffusion are the dominant mechanisms for gas-phase heat and mass transfer, respectively. A simplified model has been established to simulate gas-phase temperature and H concentration distributions between the filament and the substrate. Examination of the relative importance of homogeneous and heterogeneous production of H atoms indicates that filament-surface decomposition of molecular hydrogen is the dominant source of H and gas-phase reaction plays a negligible role. The filament-surface dissociation rates of H2 for various filament temperatures were calculated to match H-atom concentrations observed in the literature or derived from power consumption by filaments. Arrhenius plots of the filament-surface hydrogen dissociation rates suggest that dissociation of H2 at refractory filament surface is a catalytic process, which has a rather lower effective activation energy than homogeneous thermal dissociation. Atomic hydrogen, acting as an important heat transfer medium to heat the substrate, can freely diffuse from the filament to the substrate without recombination.
文摘颗粒调剖堵水是提高原油采收率的重要途径。了解颗粒在多孔介质中的运移沉积特性,便于颗粒制备的优化,提高颗粒与地层孔喉配伍性和封堵效率。综述了颗粒浓度值、粒径、多孔介质结构、粒径比、介质内流体参数等因素对运移沉积的影响,总结了简化几何、介观模拟、LB-DEM(lattice Boltzmann method-discrete element method)、CFD-DEM(computational fluid dynamics-discrete element method)等模拟方法研究结果。分析表明,粒径比的临界值影响多孔介质的沉积位置和堵塞程度,粒径不同、所受力差异较大,大颗粒受水动力、重力、流体流速影响显著。多孔介质内流体流动模型尚未完全统一,Brinkman-Forchheimer-Darcy模型适用性较强,CFD-DEM方法从微观角度对介质内运移沉积流固耦合进行了验证,为非均质储层的调剖方案提供了依据。
文摘块体搬运沉积(mass transport deposits,MTDs)是目前海洋研究方面的热点,而块体搬运沉积内部具有什么样的形态特征依然不够明确。该文基于琼东南盆地陵水凹陷高精度三维地震资料,描述了陵水凹陷L区块体搬运沉积三维地震构型,研究了盆地内深水沉积物内部结构、特征及形成机制,识别了侵蚀擦痕、逆冲推覆构造、挤压脊、水道等构造特征,并结合剖面、平面特征推测其成因及其分布规律,探讨了MTDs形成的特殊构造,并提出了三个假设:在流动开始之前已存在,并在层内被动运输;在流动运动中形成;在流动停滞期间形成。MTDs沉积层内部致密,鲜有贯穿性构造,是油气储集中良好的盖层。
基金supported by the National High Technology ICF Committee of Chinathe National Natural Science Fund of China(Nos. 10335020, 10375011, 10576007)the Laboratory of Computational Physics (No. 51479050205ZW0905)
文摘A PIC （particle-in-cell）-MC （Monte Carlo） code to model electron beam transport into dense matter is developed. The background target is treated as a cold, stationary fluid and the fast electrons as particles with the relativistic motions. The process is described by a particle-in-cell method with consideration of the influence of both the self-generated electric and magnetic fields as well as collisions between the fast electrons and the target. The collisional part of the code is solved by the Monte Carlo-type method. Furthermore by assuming that the background current balances with the fast electron current, the electric field is given by the Ohm＇s law and the magnetic field is calculated from the Faraday＇s law. Both are solved in a two-dimensional cylindrical geometry. The algorithms implemented in the code are demonstrated and the numerical experiments are performed for monoenergy homogeneous fast electron beam transport in an aluminum target when the fields, collision and angular scattering are switched on and off independently.
基金National High Technology ICF Committee in ChinaNational Natural Science Fund of China(Nos.10675024,10335020,10375011,and 10576007)+1 种基金National Basic Research Program of China(973 Program)(No.2007CB815101)the Laboratory of Computational Physics(No.51479050205ZW0905)
文摘We have developed a three dimensional （3D） PIC （particle-in-cell）-MC （Monte Carlo） code in order to simulate an electron beam transported into the dense matter based on our previous two dimensional code. The relativistic motion of fast electrons is treated by the particle-in-cell method under the influence of both a self-generated transverse magnetic field and an axial electric field, as well as collisions. The electric field generated by return current is expressed by Ohm＇s law and the magnetic field is calculated from Faraday＇s law. The slowing down of monoenergy electrons in DT plasma is calculated and discussed.
基金supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2011GB110003,2011GB110001 and2013GB107004)National Natural Science Foundation of China(Nos.11005125,11205198 and 11375010)
文摘A 3D Monte Carlo （MC） code PIC- EDDY, based on EDDY （erosion and deposition dynamic simulation） code, was used to investigate the redeposition of different impurities in the gaps of C tiles. By incorporating the rate coefficients of beryllium （Be） and tungsten （W） into the code, we obtain deposition profiles of hydrocarbon, beryllium and tungsten particles in the toroidal and poloidal gaps, respectively. The redeposition rate of tungsten was found to be higher than those of other impurities in the gaps, except at the bottom, due to its easier local deposition within one gyroradius. Due to the effect of reflection coefficients of hydrocarbon fragments on graphite, fewer hydrocarbons were resided at the entrance while more were deposited on the sides of the gap. At elevated plasma temperatures （such as 30 eV）, asymmetric deposition distributions were observed between the toroidal and poloidal gaps due to the dominant ionized particles. Ions were mainly deposited within 1 mm depth inside gaps, and the bottom deposition particles were almost all neutrals.
基金supported by National Natural Science Foundation of China(Nos.11175030,11475030,91230205,11175029 and 11375032)the National High-Tech ICF Committee of Chinathe Science and Technology Foundation of China Academy of Engineering Physics(No.2011A0102008)
文摘A two-dimensional hybrid code is developed to model the transport of a high-current electron beam in a dense plasma target. The beam electrons are treated as particles and described by particle-in-cell simulation including collisions with the target plasma particles. The background target plasma is assumed to be a stationary fluid with temperature variations. The return current and the self-generated electric and magnetic fields are obtained by combining Amp^re＇s law without the displacement current, the resistive Ohm＇s law and Faraday＇s law. The equations are solved in two-dimensional cylindrical geometry with rotational symmetry on a regular grid, with centered spatial differencing and first-order implicit time differencing. The algorithms implemented in the code are described, and a numerical experiment is performed for an electron beam with Maxwellian distribution ejected into a uniform deuterium-tritium plasma target.
文摘块体搬运沉积(mass transport deposits,MTDs)作为深水沉积体系的重要组成在资源勘探和地质灾害等方面具有重要意义。琼东南盆地深水区水合物钻探发现水合物层之上发育三套MTDs,目前对其沉积特征以及控制因素等研究不足,进而限制了其对下伏水合物藏影响的认识。本研究以紧邻水合物层的第三套块体搬运沉积(MTD3)为重点研究对象,综合利用2D/3D地震数据、测井及岩芯资料对MTD3的沉积特征进行研究,并探讨了MTD3的物质来源、控制因素以及对下伏水合物藏的影响。研究表明,MTD3的岩性主要为具有明显的变形特征的泥质沉积,在测井上表现为低伽马值和低电阻率以及不规则成像特征,在地震剖面上表现为与顶底连续性较好的强振幅反射有明显的差别低幅杂乱或空白反射;MTD3在琼东南盆地发育体部滑移区和趾部挤压区,未见头部拉张区,平面上呈条带状展布,面积约3600 km2。MTD3的沉积物质可能来源于琼东南盆地西北部陆坡,然后沿中央坳陷带自SW向NE运移。MTD3的发育受海底地形地貌、构造和地震活动、沉积速率以及海平面变化等因素的综合控制。位于趾部挤压区的MTD3与半远洋沉积共同构成下伏水合物的盖层,其致密岩性以及浅层超压共同促使水合物的富集成藏。本研究加深了对琼东南盆地第四纪浅层事件性沉积的认识,并为与块体搬运沉积相关的水合物资源预测提供地质理论指导。
