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geochemical parameter    
相关语句
  地球化学参数
    The time of hydrocarbon generation from exinite is later than coal according to the geochemical parameter of hopanes,such as occurrence of 17β(H)trisnorhopane and C_ 29βα-hopanes as peak carbon,C_ 31αβ22S/22(S+R)index.
    壳质组萜烷系列化合物的地球化学参数(以17β(H)三降藿烷、C29βα-藿烷、C31αβ22S/22(S+R))表明壳质组热演化史比煤岩有迟豫效应。
短句来源
    IDEAL MODEL AND PRINCIPLE OF STACHING STRUCTURE OF AXIAL GEOCHEMICAL PARAMETER OF GOLD DEPOSIT
    金矿床轴向地球化学参数叠加结构的理想模式及其应用准则
短句来源
    Based on summarization of change regulation of axial geochemical parameter for gold deposits, the characteristics of multi-stage stacking mineralization of gold deposit are used to establish the ideal model of axial geochemical parameter with different stacking structures. Finally, the criteria for prediction of concealed ore bodies have been determined.
    在研究和总结金矿床轴向地球化学参数变化规律的特性和共性的基础上,用金矿具有多期多阶段叠加矿成晕观点,建立了不同叠加结构地化参数轴向变化的理想模式,确定了其用于盲矿预测的准则
短句来源
    It will be a good prospecting for deep orebodies according to the analysis to the features of microelements geochemical parameter axial variation of the trench,transverse drift and drilling samples.
    通过对探槽、穿脉、钻孔样品微量元素地球化学参数轴向变化特征的分析,认为矿体的深部找矿前景较好。
短句来源
  地球化学参数
    The time of hydrocarbon generation from exinite is later than coal according to the geochemical parameter of hopanes,such as occurrence of 17β(H)trisnorhopane and C_ 29βα-hopanes as peak carbon,C_ 31αβ22S/22(S+R)index.
    壳质组萜烷系列化合物的地球化学参数(以17β(H)三降藿烷、C29βα-藿烷、C31αβ22S/22(S+R))表明壳质组热演化史比煤岩有迟豫效应。
短句来源
    IDEAL MODEL AND PRINCIPLE OF STACHING STRUCTURE OF AXIAL GEOCHEMICAL PARAMETER OF GOLD DEPOSIT
    金矿床轴向地球化学参数叠加结构的理想模式及其应用准则
短句来源
    Based on summarization of change regulation of axial geochemical parameter for gold deposits, the characteristics of multi-stage stacking mineralization of gold deposit are used to establish the ideal model of axial geochemical parameter with different stacking structures. Finally, the criteria for prediction of concealed ore bodies have been determined.
    在研究和总结金矿床轴向地球化学参数变化规律的特性和共性的基础上,用金矿具有多期多阶段叠加矿成晕观点,建立了不同叠加结构地化参数轴向变化的理想模式,确定了其用于盲矿预测的准则
短句来源
    It will be a good prospecting for deep orebodies according to the analysis to the features of microelements geochemical parameter axial variation of the trench,transverse drift and drilling samples.
    通过对探槽、穿脉、钻孔样品微量元素地球化学参数轴向变化特征的分析,认为矿体的深部找矿前景较好。
短句来源
  地化参数
    Based on summarization of change regulation of axial geochemical parameter for gold deposits, the characteristics of multi-stage stacking mineralization of gold deposit are used to establish the ideal model of axial geochemical parameter with different stacking structures. Finally, the criteria for prediction of concealed ore bodies have been determined.
    在研究和总结金矿床轴向地球化学参数变化规律的特性和共性的基础上,用金矿具有多期多阶段叠加矿成晕观点,建立了不同叠加结构地化参数轴向变化的理想模式,确定了其用于盲矿预测的准则
短句来源
  地化参数
    Based on summarization of change regulation of axial geochemical parameter for gold deposits, the characteristics of multi-stage stacking mineralization of gold deposit are used to establish the ideal model of axial geochemical parameter with different stacking structures. Finally, the criteria for prediction of concealed ore bodies have been determined.
    在研究和总结金矿床轴向地球化学参数变化规律的特性和共性的基础上,用金矿具有多期多阶段叠加矿成晕观点,建立了不同叠加结构地化参数轴向变化的理想模式,确定了其用于盲矿预测的准则
短句来源
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  geochemical parameter
Near the transform which bounds the AAD to the east, there is a marked change in the morphology of the spreading center, as well as in virtually every measured geochemical parameter.
      
The focus of this study is placed on the application of geochemical parameter and signature analyses related with the aforementioned geological units, which are of subcontinental extension into South America.
      


Matured source rock samples in which the oil is not expelled,in Jiyang sag is crushed and water is added. Samples processed as above is put in a specially designed device for simulatingoil and gas generation and migration to simulate the migration of pore fluids systemmatically, under temperature and pressure at a level near to the reservoir conditions. By an analysis and comparison between the products in the simulation test and the physical propertiesand geochemical parameters of the samples taken from...

Matured source rock samples in which the oil is not expelled,in Jiyang sag is crushed and water is added. Samples processed as above is put in a specially designed device for simulatingoil and gas generation and migration to simulate the migration of pore fluids systemmatically, under temperature and pressure at a level near to the reservoir conditions. By an analysis and comparison between the products in the simulation test and the physical propertiesand geochemical parameters of the samples taken from a profile in Jiyang sag, authorsdemonstrate that after a certain depth of burial was reached, primary migration of the porefluids will occur in a intermittent flow through fractures induced by internal pressure in thepore space. The characteristics of intermittent flow is discussed. It is demonstrated that intermittent flow is one of the major form of primary migration of the petroleum but is not the only way.

将济阳拗陷已成熟但未排过油的烃源岩样品粉碎、加水,在近似地层的温度和静岩压力下,用专门设备──油气生成运移模拟系统模拟流体运移。通过对模拟产物及济阳坳陷一系统地层剖面样品的物性及地化参数的分析与对比,揭示了在沉积岩达到某一深度后,流体是以流体间歇压裂泥岩的不连通孔隙,形成间歇流的方式进行初次运移,并对问歇流的特征进行了讨论,指出它是石油进行初次运移的重要方式之一。

Shanxi formation of Permo-Carboniferous coal measures in Tengnan and Datun mine area is considered as a genetic stratigraphic unit of deltaic depositional system. The unit can be subdivided into three growth sequences, which reveals a filling process of the river dominant delta prograding onto a shallow water estuarine. Two major distributaries,trending NW-SE, were the critical factors in control of the disposition and evolution of deltaic depositional features. Peat swamps were mainly developed in the interdistributary...

Shanxi formation of Permo-Carboniferous coal measures in Tengnan and Datun mine area is considered as a genetic stratigraphic unit of deltaic depositional system. The unit can be subdivided into three growth sequences, which reveals a filling process of the river dominant delta prograding onto a shallow water estuarine. Two major distributaries,trending NW-SE, were the critical factors in control of the disposition and evolution of deltaic depositional features. Peat swamps were mainly developed in the interdistributary low-lying areas. The extent and process of peat accumulation were dictated by the construction and abandonment of contemporanous splys and sub-deltaic lobes, leading to the spliting of coal seams. According to the petrographic associations and geochemical parameters,the major coal seam may be distinguished into orderly genetic sequences in response to the fluctuation of swamp water table during peat formation.

滕南、大屯矿区石炭二叠纪含煤岩系山西组是由三角洲沉积体系单元构成的1个成因地层单位,可进一步划分为3个生长层序,代表了河控三角洲进积浅水海湾的充填过程。2条北西-南东向主分流河道是本区沉积体系单元配置及其演化的控制因素,泥炭沼泽主要发育于分流间洼地。决口扇、子三角洲朵体的建设和废弃在很大程度上支配了泥炭沼泽发育的范围和泥炭堆积的过程,是造成本区煤层分叉的基本动力机制。根据煤岩类型组合和地球化学参数可将主采煤层区分为有序的成因层序,大体反映了泥炭沼泽的充水动态过程。

With case study of the Xiangshan uranium deposit, the present paper has illustrated the concept and mechanism of neutralizing reduction mineralization. Uranium has two main valences, i.e., Ⅳ and Ⅵ, with U(Ⅳ) tending to precipitate as uranium minerals characterized by low solubility, but U(Ⅵ) exhibiting strong mobility in solutions. Hence, studies of mechanism of uranium mineralization used to focus on the process of reduction and the reducing agents. However, a lot of hydrogeochemical data from uranium deposits...

With case study of the Xiangshan uranium deposit, the present paper has illustrated the concept and mechanism of neutralizing reduction mineralization. Uranium has two main valences, i.e., Ⅳ and Ⅵ, with U(Ⅳ) tending to precipitate as uranium minerals characterized by low solubility, but U(Ⅵ) exhibiting strong mobility in solutions. Hence, studies of mechanism of uranium mineralization used to focus on the process of reduction and the reducing agents. However, a lot of hydrogeochemical data from uranium deposits show that the environments for the dissolution and migration of uranium vary from acid, neutral to alkali media, while the environments for mineralization are almost always limited to neutral media, that is, almost all uranium deposits are formed in a near neutral environment. When the reductive ability of uranic solution remains constant, the process of reduction and precipitation of uranium mainly caused by neutralization instead of by the increase in the reducing agents or the decrease in the Eh value of the fluid is termed neutralizing reduction precipitation, and the resulting mineralization is called neutralizing reduction mineralization. The Xiangshan uranium orefield was found in a Mesozoic volcanic basin in southeastern China, in which there exist soda metasomatic type and fluorite hydromica type uranium mineralizations. Fluid inclusion study shows that the hydrothermal solution for the soda metasomatic type mineralization was alkali in the pre ore satage (pH=8.86~9.24), and became near neutral(pH=6.66~7.21) in the ore forming stage. From the pre ore stage to the mineralization stage, the fluid for the fluorite hydromica type uranium deposits changed from weak acidic (pH≈5) to near neutral (pH=6.1~7.01). In summary, the geothermal solutions evolved from acidic or alkali to neutral during the process of uranium mineralization. The difference between the Eh value for water (Eh W) and the critical redox potential of uranium reduction precipitation (Eh U,C ) is termed relative redox potential between water and uranium (ΔEh W U ), which is a comprehensive geochemical parameter controlling the reduction and precipitation of uranium. If ΔEh W U >0, then uranium will migrate in solution; if ΔEh W U <0, uranium will be reduced and precipitated. Consequently, uranium deposits could be formed not only in the transitional zones with distinctly incresed reducing agents, but also in the neutralizing zones without increase in amounts of reducing agents or decrease in Eh of the solution. Neutralization is the key factor for the reduction and precipitation of uranium in most circumstances. The idea of neutralizing reduction mineralization furnishes a new way to the study of mechanism of uranium mineralization.

该文以相山矿田为例介绍了铀的中和还原成矿作用的概念和机理。现已证明铀矿床不仅可以形成在还原显著增加的氧化-还原过渡带,而且可以形成在没有还原剂增加或溶液Eh值下降的中和作用带。实际上,中和作用是大多数情况下导致铀还原沉淀的关键因素。中和还原成矿作用的思想为研究铀成矿机理提供了一条新的思路。

 
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