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seismic profiles
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  地震剖面
    Through the characteristics of geophysical field and the distribution of faults, especially by interpretation of seismic profiles and contrdsting well data, we compared and interpreted seven reflected interfases, Tl, T2, T3, T4, T5, T6 and Tg, of which Tg, T5 and T3 represent three regional unconfondties and are the reflections of three tectonic movements in the Cenozoic sediments of Wanan Basin.
    通过分析区域地球物理场特征及断裂分布,以及地震剖面的解释并结合钻井资料对比分析,在万安盆地新生代沉积中对比解释出T1,T2,T3,T4,T5,T6和Tg等7个地震反射界面。
短句来源
    Seven seismic reflective boundaries (T_1、 T_2、 T_3~1、 T^ T_4、 T_5 and T_g) from up to low are recognized in the seismic profiles of Wan'an basin based on the analysis of seismic re- flective features.
    根据地震反射特征,万安盆地地震剖面由上而下识别出T_1、T_2、T_3、T_3~1、T_4、T_5、T_g共7个地震反射界面。
短句来源
    By using the seismic profiles across the southwest subbasin and the velocity structure and basement of the sediments from the sonobuoy data,together with the drilling data from the shelf that are correlated with those of the strata in the neighboring sedimentary basin, five seismic reflection boundaries have been recognized, named T2,T3,T4,T5,and Tg.
    利用横穿西南海盆的地震剖面,结合声纳浮标资料获得的海盆中沉积物及基底的速度结构,同时结合陆上的钻井分层,并与邻区的沉积盆地地层进行对比,在西南海盆中划分出T2、T3、T4、T5、Tg5个反射界面。
短句来源
    Lithofacies and paleogeography of the Early Paleozoic in the basin was researched based on 48 wells which reached or penetrated the Paleozoic, 9800 km seismic profiles, a large amount of isotopes and trace elements composition analyses and other relevant data.
    通过盆地内48口钻至下古生界钻井的沉积层序与沉积相分析、9800km地震剖面的地震相分析、大量Sr、C同位素及微量元素分析,并结合相关资料,开展了寒武纪—奥陶纪的以世或期为单位的岩相古地理研究,定性探讨海平面变迁。
短句来源
    The thesis analyses seismic profiles, gravity and magnetic anomalies, sat-telite photographs, topographic characteristics, stratigraphic thicknesses, crustal deformations, distribution of earthquakes, Volcanics and so on. It is discovered that there are three fault systems (NEE, NW, and NE in direction) in the strait. Among them, the NEE and NW running fault systems dominate and constitute the framework of the faulting structures.
    本文从地震剖面、重磁异常、卫星照片、地貌特征、地层厚度、地壳形变、地震及火山分布等方面综合分析,认为琼州海峡主要发育NEE,NW及NE向三组断裂系,并对它们的活动性进行了初步的探讨。
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    With the help of work station, separation of seismicsequences and the interpretation and integration of seismic profiles were achieved,further, the residual basin’s spatial distribution was figured out.
    残留盆地的南界位于勿南沙隆起的南部,地震 BP47 测线附近,也为断层接触,整个残留盆地的走向为北东方向,与青龙组在陆上的分布相一致。
短句来源
    In this paper, part of 4 seismic profiles in Qiongdongnan basin was restored by2DMove software. We calculated the extension parameters of every balancedcross-section in the different period, quantitatively analyzed the intensity of tectonicevolution in the study area, expatiated the tectonic evolution history of Qiongdongnanbasin, and primarily discussed the relationship between the formation of gas hydrateand the tectonic evolution.
    本文通过运用2DMove软件,对琼东南盆地研究区四条测线的部分剖面进行构造复原,计算出了各条剖面每个时期的伸展参数,对研究区构造活动强度进行了初步的定量分析,进一步明确了琼东南盆地构造演化史,初步探讨了与天然气水合物形成的联系。
短句来源
    The shallow seismic profiles show that the clinoform comprises three units:from the lower to the upper, has SU3,SU2 and SU1,maximum thick up to 40m.
    SU1显示加积型的反射特征,内部反射层为近似水平的连续反射,最大沉积厚度超过18m,其底部为切割下伏地层的侵蚀面。 对应于楔形沉积体的两个钻孔岩心由三个沉积单元组成,从下到上依次为DU3、DU2、DU1,与SU3、SU2、SU 1相对应。
短句来源
    the southern part of the delta, however, is gradually progradating southeastern ward as revealed by shallow seismic profiles and sediments.
    由于科氏力、径、潮流及苏北沿岸流的作用,长江水下三角洲沉积主体目前正逐步偏向东南,这导致北部不断受改造、废弃。
短句来源
    Seismic stratigraphy analysis on high-resolution seismic profiles along themud coast of Taishan, Guangdong, with total length of 150km, has been carried outto research the rugged basement overlying Quaternary sediments, sedimentaryevolution and complex neotectonic process.
    根据广东台山广海湾150km高分辨率地震资料,研究岬湾型海岸起伏多变的基底和上覆的第四纪沉积层序、沉积演化以及复杂的新构造作用。
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  seismic profiles
The seismic profiles image several faults, bottom simulating reflectors, and a large rotational slump.
      
Concepts related to Mathematical Information Theory detect some seismic profiles of the refraction experiment which give the most homogeneous coverage of the model in terms of number of trajectories crossing it.
      
From an analysis of many seismic profiles across the stable continental regions of North America and northern Europe, the crustal and upper mantle velocity structure is determined.
      
In 1977, two seismic profiles were carried out in Martinique, one in the area of 'Montagne Pelée' volcano, and the second in the eastern part of the island.
      
In 1976 and 1977, seismic profiles were carried out in Guadeloupe.
      
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In recent years, non-dynamite seismic sources—PAR Air Guns ha ve found wide applications in marine seismic exploration. PAR Air Gun consists of an array of guns (with up to more than 30 guns) to increase the cxcitation energy. When it is used in shallow water and marsh zones, however, the energy output of the excited sound pulse drops sharply because of the short distance between the bo ttom and the surface of the water. No satisfactory result can be achieved in incre asing the output energy by...

In recent years, non-dynamite seismic sources—PAR Air Guns ha ve found wide applications in marine seismic exploration. PAR Air Gun consists of an array of guns (with up to more than 30 guns) to increase the cxcitation energy. When it is used in shallow water and marsh zones, however, the energy output of the excited sound pulse drops sharply because of the short distance between the bo ttom and the surface of the water. No satisfactory result can be achieved in incre asing the output energy by enlargng the air gun dimension or by increasing the air gun chamber volume. The air gun described in this paper has an additional air chamber with a piston and a release port of the same configuration. The second chamber will not change the sound pulse wave form and the two chambers are connected to form a combined chamber. In firing, the pressure decrease in the second chamber is affected by that in the first one, which greatly increases the velocity of the piston in the second chamber and make it possible to release efficiently the energy stored in the high pressure air.In this way, the tandem piston air gun is capable of producing high energy sound pulse excitations. To meet the requirements of working in shallow water and marsh areas, plug-in excitation in the mud has been adopted instead of excita tion in the water. This greatly increases the energy output of the sound pulse produced by the air gun Field tests show the tandem piston air gun can produce sound pulses with effe ctive energy concentrated between 10—80 Hz, the primary frequency being in the proximation of 35 Hz. This meets the basic requirements of seismic exploration. With identical air pressure and chamber volume, the tandem piston air gun can produce 6 times more energy than marine air guns. Its seismic profile record is eq uivalent to that produced by 3 kg of TNT explosives.

近年来,非炸药震源——气枪(PAR Air Gun),已广泛使用在海洋地震勘探。它用多枪組合法(組合数达30多只)来提高激发能量。但是,当它在浅水沼泽地区使用,由于水底与水面較近,气枪所激发的声脉冲能量輸出急剧下降。用加大枪室容积,增加气枪压力等方法,效果极不理想。本文主要叙述气枪在不改变排气口形状及激发的声脉冲波形特征情况下,增加一个带有同样排气口和加速开門活塞的第二气室,两个气室相互联合,二个活塞相互串联,构成一个串联双活塞气枪,簡称为联合气枪。由于第二气室的减压是受第一气室减压的影响,促使第二气室的开门活塞速度大大提高,贮能的高压气便得到充分有效的释放,从而达到了联合气枪的大能量声脉冲激发。为适用于浅水沼泽地区工作,现将气枪位于水中激发方式变为插入泥层中的激发方式,大大提高了声脉冲能量輸出。测量表明,联合气枪的激发能量大部分集中在10赫~80赫。主频率在35赫附近,基本符合地震勘探。在相同工作压力与容积条件下,联合气枪的激发能量比气枪大6倍以上。其地震剖面記录效果和3公斤炸药井炮相当。

A seismic reflection survey for investigating the structure of Okinawa Trough was carried out in June, 1982. The seismic strata in the Trough are divided into three layers, the upper layer, the middle layer and the lower llayer, they are Pleistocene, Pliocene and Miocene, respectively. The upper layer is of parallel or subparallel seismic reflection configuration, The reflection interfaces keep primary sedimentary structure, and are easy to be tracked continuously, the energy reflected from...

A seismic reflection survey for investigating the structure of Okinawa Trough was carried out in June, 1982. The seismic strata in the Trough are divided into three layers, the upper layer, the middle layer and the lower llayer, they are Pleistocene, Pliocene and Miocene, respectively. The upper layer is of parallel or subparallel seismic reflection configuration, The reflection interfaces keep primary sedimentary structure, and are easy to be tracked continuously, the energy reflected from which is intensive. The middle layer is folded slightly. The seismic interface of middic layer appears mostly in short curves due to faulting and folding, the energy from which is either strong or weak. The interface can not be tracked in wide area, because the seismic sequences lost primary sedimentary structure already. The lower is a deformed layer. The interface of lower llayer is rough and obscure, the reflection energy from which is so weak that the lojwer layer are even reflection-free or with chaotic seismic reflection configuration.There are several seismic onlaps of stratal configuration for each layer, implicating relative changes of sea level in geological time. Three important sedimentation cycles were found in upper layer, and the progradational reflection configuration can be distinguished in seismic profile DSIII. Numerous contemporary structures, as growth faults and roll over structure, are produced in sedimentation process.

冲绳海槽的地震反射波组,根据变形程度分为三组,即未变形的A层组,微变形的B层组和严重变形的c层组。局部地区出现D层组。A层组的地质年代可能是更新统至现代的沉积,海槽南段较厚,其旅行时最大近2秒,北段较薄,最薄约0.3秒。B层组可能是上新统的沉积,其厚度变化与A层组相反,南段薄,北段厚。C层组则可能是中新统和比中新统更老的地层。 海槽中充分发育着顺海槽走向的高角度正断层,为海槽的裂陷成因提供了可靠的依据。

The application of shallow seismic profile,side-scan sonar,magnetic servey and echo sounder in engineering geological investigation in river and offshore area was discussed in this paper The basic principles,investigation methods,and selection of instrument parameters were also discussed.Some practical examples were presented to show the correct way of applying these methods to obtain satisfactory resalts.

本文主要讨论浅地震剖面、旁侧声纳、水深测量及磁力测量等几种地球物理方法在近海与江河等水域工程地质调查中的应用,包括它们的工作原理、调查方法与仪器参数的选择及调查中应注意的问题,并用具体事例说明如何正确地运用这些方法而获得较为满意的效果。

 
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