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major source
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    Organic facies of major source rocks in Baiju sag of Subei basin are classified using theory and analysis method on organic facies.
    应用有机相理论和分析方法,划分苏北盆地白驹凹陷主要烃源岩的有机相;
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    The major source rocks (Chijinpu Formation and lower part of Xiagou Formation, Lower Cretaceous) reached a peak of petroleum generation during the late Neogene Quaternary, that were controlled by tectonic and buried history in the Qingxi depression, and that are still in a maturity high maturity stage now, during which oil is mainly generated and oil pools are mainly formed.
    青西坳陷的构造埋藏史控制了主要烃源岩(下白垩统赤金堡组和下沟组下部 )在晚第三纪晚期—第四纪才达到生油高峰期 ,目前仍处于成熟—高成熟阶段 ,因此以生油为主 ,主要形成油藏。
短句来源
    The Triassic and Jurassic source rocks (including the Carboniferous Permian source rocks in some regions) are major source rocks in the foreland basins of central western China, whose formations are controlled by depressions or faulted sags developed in the early stage of the foreland basins and warm humid climate.
    受中生代前陆盆地早期阶段坳陷或断陷发育及温暖潮湿气候控制 ,主要烃源岩是三叠系—侏罗系 (部分包括石炭 二叠系 )烃源岩。
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    Study shows that Kumux basin is of bright explo ration prospecting for its two sets of major source rocks,good reservoir-seal assemblage and multi-trap types.
    库米什盆地具有良好的勘探前景:发育两套主要烃源岩、具良好的储盖组合和多种圈闭类型。
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    The paper presents firstly the features of the hydrocarbon-expulsion of the major source rocks in the Kuqa rejuvenated foreland basin, northwestern China.
    本文首先在数值模拟的基础上对库车再生前陆盆地中主要烃源岩的排烃特征进行了研究。
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    Distribution of Dibenzothiophenes in Crude Oils from Tarim Basin and Identification of Major Source Rock Types
    塔里木盆地原油中二苯并噻吩的分布及主力油源岩类型判识
短句来源
    There are six major source rocks (T_3, P_2~1,P_1~(1+2),S_1,∈_1 and Z_2)and five petroleum systems (Z_2-∈_1,∈_1-S,S-P_1,P-T_2 and T_3-J)in this basin, among which commercial gas reserves are offered except the ∈_1-S system.
    该盆地有T_3,P_2~1,P_1~(1+2),S_1,∈_1和 Z_2六套主力烃源岩和 Z_2—∈_1,∈_1—S,S—P_1,p—T_2,T_3—J 五套成油气体系。
短句来源
    For the oldest Mesozoic sediments at the bottom of the Fanghushan Formation (J_1),major source area was composed of the rocks of early Paleozoic and Laliang ages (1700~1900 Ma) from the North China Block.
    在合肥盆地最古老的中生代地层中(防虎山组,J_1),底部的沉积物源区主要为华北陆块早古生代和吕梁期(1700~1900Ma)的岩石。
短句来源
    The threshold depth for oil generation(Ro=0.6%) of the major source rocks is about 5000 meter underground and the peak of oil generation and drainage was in Himalayan,which matched the trap-forming period of the sag.
    主力烃源岩生烃门限深度(Ro=0.6%)约在5 000 m左右,生烃高峰和排烃高峰期在喜马拉雅期,与凹陷内圈闭的形成期相匹配.
短句来源
    Coal will remain the major source of energy resource in quite a long time.
    中国煤炭资源丰富,是世界第一产煤大国,并且以煤炭为主的能源结构在相当长的时间内不会改变。
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  major source
At the measured thermal conductivity, G≈6×10-12 W/K, and a time constant of τ=0.2 μs, and a temperature of 300 mK, the estimated noise-equivalent power NEP=5×10-18 W/Hz1/2, assuming that temperature fluctuations are the major source of noise.
      
An aperture in a ring laser with plane mirrors is shown to be a major source of rescattering of oppositely directed waves.
      
The source of urban atmospheric particles is broad, and the major source is the building dust from urban construction.
      
Vehicle emissions are a major source of air pollution in urban areas.
      
Conclusions: Faith healers are a major source of care for people with mental health problems in Pakistan, particularly for women and those with little education.
      
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Hundreds of years ago, the diamond was found in western part of Hunan province. Since 1954, geological prospecting has been carried out by teams under the leadership of the Ministry of Geology and has covered an area about 1.5 hundred thousand square kilometers. The placer was the sole object of prospecting during the period from 1954 to 1960. After that, most labours and investment have been contributed to the exploration for lode diamond deposits of kimberite type. But none of commercial interest has been...

Hundreds of years ago, the diamond was found in western part of Hunan province. Since 1954, geological prospecting has been carried out by teams under the leadership of the Ministry of Geology and has covered an area about 1.5 hundred thousand square kilometers. The placer was the sole object of prospecting during the period from 1954 to 1960. After that, most labours and investment have been contributed to the exploration for lode diamond deposits of kimberite type. But none of commercial interest has been gained so far. Based on the theory of diamond geology, the results of explorations, and qlenty informations of field geology, some evidences, considerations and conclusions obtained can be summerized as follows. 1. Placer diamonds are not only wide-spread in the drainage area of Yuanshui and its tributaries, but also scattered in its adjacent areas---the valleys of Lishui, Zi-shui, Xiangshui, Wujiang, Duliujiang, and Hongshuihe as well as Tayao mountains of Guangxi. It is obvious that the distribution of placer diamonds is neither controlled by geomorphology, nor confined to any special tectonic unit. They are highly disseminated in the Quarternary sand and gravel beds. Strickly speaking, no placer deposits of ordinary quality presents in this region. The so-called spoon-like placer deposits located at Changde and Taoyuan counties of Hunan Province are rather small and poor. 2. Pyrope is an intimately associated mineral with diamond in kimberite. Therefore, it is regarded as an useful and favourable indicator for diamond explora-tion. However, it was hardly found in this region, either in the Quarternary or in pre-Quarternary sediments. There is an exception in Maping Creek where the pyrope content in sediments comes to hundreds of grain per cubic meter. 3. The region between Zhenyuan and Sanshui counties of Guizhou province is a region of meta-alkaline ultrabasic rocks which consist of 13 rock belts with hundreds of dike and sill. The major rock-species are prowersite and porphyrite-mica-peridotite. Maping micaceous kimberite may be the extreme member of this rock complex. Both No. 1 and No. 2 of Maping micaceous kimberite bodies are small dikes and occur in the limestone and dolomitic limstone of Upper Cambrian They are rich in pyrope and yield a few diamonds of fine grain grade. The average weight of grains is only 0. 17mg. such dikes are unprofitable and make no influence on present distribution of diamond in Yuanshui drainage. In Zhengyuan and Sanshui counties of Guizhou Province, it is possible to find some new dikes or sills with similar characters, but no profitable pipe would be expected to find out. 4. The discovery of secondary sources of diamond, a great achievment of prospecting works has been made recently. The secondary sources, five different age horizons of clastic sedimentary rocks containing diamonds have been recognized. They are: (1) the tillite beds of Changan Formation of Lower Sinian from the juncture of Hunan, Guizhou and Guangxi; (2) The quartzitic sandstone beds of Lianhuashan Formation of Lower Devonian; (3) The sandstone and conglomerate beds of Yujiang Formation of Lower Devonian and Bangzhai Formation of Middle Devonian from northern and central Guangxi and Guizhou; (4) The arkosic sand-stone, siltstone beds of Upper Triassic. and Jurassic, from Jingxian Basin south-western Hunan; and (5) The red beds of Cretaceous and Lower Tertiary distributed mainly along Yuanshui valley and in the surrounding area of Tongting Lake. The five secondary sources seem to be the transfer-stations on the long way of diamond traveling. Some diamonds have been distintegrated from them. They found their homes in Quarternary sediments and finally made up a complicated and uncomprehensible pattern of diamond-diffusions. It may interpret why the panning technique along river system produces little effect. 5. According to theory on genesis of diamond deposits, the author regards that it seems to be impossible to look for the profitable kimberite pipes in the tectonic unit with folded basement. Yangtze Platform (especially Jiangnan anteclise) is just one of this kind unit. 6. It may be no doubt that the tillite of Changan Formation of Lower Sinian is the major source of diamond in the studying region. The author has also discu-ased the possibilities and ways to searching pre-Sinian primary diamond deposits.

据民间传说,湘西金刚石的发现已有几百年历史。建国后,自1954年开展金刚石地质工作以来,普查面积已达15万平方公里。1954至1960年间,砂矿是唯一的工作对象;此后则把大量人力、财力投于寻找金伯利岩型原生矿。但直至目前,湘、黔、桂三省(区)尚未发现有价值的金刚石原生矿床。根据金刚石地质学原理、普查成果和大量的野外地质资料,已获得一些证据、见解及结论,现概括如下: 1.金刚石不仅较广地分布沅水流域各地,而且也零星散布于相邻地区,譬如澧水、资水、湘水、乌江、都柳江和红水河诸流域的一些地点,还有广西的大瑶山区。可见它的分布明显不受地貌控制,也不局限于某一特定的大地构造单元。同时又高度分散于第四纪砂矿中。严格地说,本区并不存在名符其实的砂矿床,产于湖南常德、桃源两县的勺形砂矿(也称细谷砂矿),毕竟很小且贫。 2.镁铝榴石是金刚石在金伯利岩中密切共生的矿物,常作为寻找金刚石矿的指示性矿物。但在本区第四系或前第四系里都很难找着,唯一的例外是马坪小溪,那里的镁铝榴石在沉积物里的含量可达几百颗/立方米。 3.贵州镇远、三穗两县间,是一个偏碱性超基性岩岩区,可分出十三个岩带,共有岩墙、岩床几百个。主要岩类是橄辉云煌岩和斑状云...

据民间传说,湘西金刚石的发现已有几百年历史。建国后,自1954年开展金刚石地质工作以来,普查面积已达15万平方公里。1954至1960年间,砂矿是唯一的工作对象;此后则把大量人力、财力投于寻找金伯利岩型原生矿。但直至目前,湘、黔、桂三省(区)尚未发现有价值的金刚石原生矿床。根据金刚石地质学原理、普查成果和大量的野外地质资料,已获得一些证据、见解及结论,现概括如下: 1.金刚石不仅较广地分布沅水流域各地,而且也零星散布于相邻地区,譬如澧水、资水、湘水、乌江、都柳江和红水河诸流域的一些地点,还有广西的大瑶山区。可见它的分布明显不受地貌控制,也不局限于某一特定的大地构造单元。同时又高度分散于第四纪砂矿中。严格地说,本区并不存在名符其实的砂矿床,产于湖南常德、桃源两县的勺形砂矿(也称细谷砂矿),毕竟很小且贫。 2.镁铝榴石是金刚石在金伯利岩中密切共生的矿物,常作为寻找金刚石矿的指示性矿物。但在本区第四系或前第四系里都很难找着,唯一的例外是马坪小溪,那里的镁铝榴石在沉积物里的含量可达几百颗/立方米。 3.贵州镇远、三穗两县间,是一个偏碱性超基性岩岩区,可分出十三个岩带,共有岩墙、岩床几百个。主要岩类是橄辉云煌岩和斑状云母橄榄岩;镇远马坪的云母金伯利岩,可能是前二者的端员岩类。马坪1号、2号云母金伯利岩体都是小岩墙,产于晚寒武世的灰岩、白云质灰岩中,富含镁铝榴石,产极少量细粒级金刚石,平均粒重仅0.17毫克。这类岩墙都无工业利用价值。在镇远、三穗一带,固然有可能找到类似的岩墙或岩床,但不能指望找到可供利用的岩管。 4.金刚石次生源在本区的发现,是普查工作的重大成就。鉴别出来的五个次生源,都是属于不同时代、略含金刚石的碎屑岩地层。它们是:(1)早震旦世长安组里的冰碛层,分布于湘、黔、桂毗邻区;(2)早泥盆世莲花山组石英砂岩;(3)早泥盆世郁江组和中泥盆世邦寨组砂砾岩。(2)、(3)多见于桂中、桂北及黔南等地;(4)湖南靖县盆地晚三叠世至侏罗纪的长石砂岩、粉砂岩等;(5)广泛分布于沅水中、下游及滨湖地区的白垩纪至早第三纪红色岩层。五个次生源似乎是金刚石长途旅行中的“转运站”,金刚石不断地从各次生源解离出来, 并在第四系找到归宿,从而构成了一幅既复杂又难理解的金刚石扩散图。由此也可知道,采用淘选技术追溯河流找矿,为什么成效不显著的原因。 5.根据金刚石矿的成因学说,作者认为,在具有褶皱基底的大地构造单元,似乎不存在可供利用的金伯利岩岩管的前景。本区所在的扬子地台(尤其是江南台背斜),正是这样的单元。 6.长安组里的冰碛层无疑是本区金刚石的主要来源。作者也讨论了探索前震旦纪金刚石原生矿的可能性和途径。

North Dongpu depression is a highly explored area,where seismic line density comes up to 0.5×0.5(km).Drilling proves this area to be prolific of oil.Dongpu depression is a fault basin in which Meso- zoic-Cenozoic sediments are dominant,the maximum thickness of Pa- leogene formation being 7,000m.This sediment series consists of two major sedimentary cycles,whose middle includes four kinds of salt lake facies;salt-gypsum facies,mudstone facies (sand<20%),sand stone facies and sand-conglomerate facies.The four...

North Dongpu depression is a highly explored area,where seismic line density comes up to 0.5×0.5(km).Drilling proves this area to be prolific of oil.Dongpu depression is a fault basin in which Meso- zoic-Cenozoic sediments are dominant,the maximum thickness of Pa- leogene formation being 7,000m.This sediment series consists of two major sedimentary cycles,whose middle includes four kinds of salt lake facies;salt-gypsum facies,mudstone facies (sand<20%),sand stone facies and sand-conglomerate facies.The four salt lake facies horizons form major source rock and reservoir system;therefore,it is signifi- cant to ascertain their distributions.The distributions of these lake facies horizons can be ascertained by integrative analysis of specially processed seismic data and drilling data.Rock salt was formed in very high sedimentary speed;therefore,its sedimentary context only occurs in active structural enviroment.There was such structural condition in Dongpu depression.In main subdepression where source rock was prolific,the sedimentary speed could come up to 0.26mm/a.Salt-an- hydrite beds were controlled by second order faulting,and they distribute in downthrow blocks of second order faults.All the four kinds of salt lake facies distribute in ringlike zones.From basin margin to the center, the facies sequence is sand-conglomerate facies,sandstone facies,mud stone facies and salt-gypsum facies,that is to say,sediment changes from elastic deposit to chemical deposit.

东濮凹陷北部为一勘探程度较高6号地区,地震测网密度已达0.5×0.5(km)。钻探已经表明本区为油气富集区。东濮凹陷是一个以中、新生代沉积为主的断陷盆地,下第三系地层最大沉积厚度可达7,000m。这套地层自下而上表现为两大沉积旋回,在这两次旋回的中期发育了四套盐湖相沉积,即盐膏相,偏泥相、偏砂相和砂砾相,它们构成本区主要生油层系和重要的储集层系。因此查清这四套沉积相的分布是有重要价值的。利用各种特殊处理的地震信息与岩相的关系,并依据钻井资料对岩相加以标定,可以预测这四套盐湖沉积相的分布。由于岩盐的沉积速率很高,通常只在活动性的构造条件下才适应这种沉积环境。东濮凹陷完全具备这种构造条件。本区主要生油次凹的沉积速率可高达0.26mm/a。本区各成盐岩期的盐膏岩受二级断层活动的控制,都分布在二级断层的下降盘。四套盐湖相的沉积规律相同,相带均呈环带状。由湖盆边缘至沉积中心,岩性由粗变细,岩相由砂砾相→偏砂相→偏泥相→盐膏相,即由碎屑岩沉积序列变到化学沉积。

Chahe tin deposit is one of the oldest tin deposits in China. Its tectonic stting is considered to be a proterozoic rift bordering the west margin of Yangtze plate-form. The rift sediments named Huili Group comprises a huge sequence of flysch formation, which underwent regional dynamic metamorphism and intrusion of granites. The tin deposit occurrs as replacement products of marbles and meta-basi-tes contacting with the Jinning granites. Three episods can be distinquished among the granites and only the latest...

Chahe tin deposit is one of the oldest tin deposits in China. Its tectonic stting is considered to be a proterozoic rift bordering the west margin of Yangtze plate-form. The rift sediments named Huili Group comprises a huge sequence of flysch formation, which underwent regional dynamic metamorphism and intrusion of granites. The tin deposit occurrs as replacement products of marbles and meta-basi-tes contacting with the Jinning granites. Three episods can be distinquished among the granites and only the latest one was directly related to tin mineralization.The skarn alteration and related mineralization exhibit distinct zoning, from outer inward the following mineral associatons occurr: (1) pyroxene + wollastonite; (2) idocrase + garnet; (3) casiterite + actinolite + magnetite; upon which the late casiteritesulphides developed. These zones extend in the form of lenses or striti-forms, obviously controlled by the properties-of the country rocks.The granites are believed to be the major source of tin and fluids; the transportation and deposition of tin were to a large extent resulted by the differentiation of magma;the release of tin by gre-senization seems impossible.

岔河锡矿床产于元古宙裂谷环境中,其形成与晋宁期的花岗质岩浆活动有关。矿化及有关的矽卡岩化蚀变为含矿热液对大理岩等围岩交代的产物,皆围绕岩体接触带分布,并呈现良好的分带。含矿热液主要来自花岗岩,它提供了主要的流体和锡。锡的迁移、富集主要经历了岩浆结晶分异及围岩蚀变两个过程,分异作用是锡在热液中逐渐富集的主要原田,而云英岩化等蚀变中“脱载”出来的锡难以造成锡矿化。

 
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