构造应力场三维数值模拟的有限单元法     

田宜平  刘雄  李星  魏民 《地球科学》2011,36(2):375-380

目前构造应力场的研究主要是基于平面的二维分析,随着油气成藏过程三维模拟的发展,应力场的三维数值模拟显得越来越重要.从三维空间角度出发,分析了应力场的有限元模拟与求解的整个过程.基于不规则六面体单元的角点网格数据模型,对有限元求解法进行了分析与研究并提出计算方法.基于不规则角点网格数据模型的三维构造应力场有限元计算方法是本文的创新点.最后用上述方法对东营凹陷的牛庄-王家岗区域三维应力场进行了实际模拟计算,计算结果相比于其他数据模型更符合实际情况.   相似文献   

石油污染多孔介质湿润性变异特征   总被引：1，自引：0，他引：1  

梁春  郑西来  张俊杰 《地球科学》2011,36(4):765-770

一定程度的石油污染可使多孔介质的湿润性发生变异,导致介质持水能力降低、地下水石油污染、粮食产量品质下降等.采用滴水穿透时间法与酒精溶液入渗法,测定了亚粘土和粗砂在不同柴油、机油含量下的斥水水平,确定了亚粘土、粗砂由亲水表面变为疏水表面的临界含油量.结果表明,亚粘土、粗砂湿润性变异的临界机油含量分别约为7%、0.5%,粗砂湿润性变异的临界柴油含量约为14%,而柴油污染对亚粘土湿润性的影响不显著.另外,当石油污染多孔介质的含水量达到某一临界值时,湿润性将再次发生反转,由疏水表面变回亲水表面.测得机油、柴油污染粗砂的临界含水量约在0.2%~1%之间,机油污染亚粘土的临界含水量在数值上与其含油量近似相等.   相似文献   

表面活性剂强化空气扰动修复氯苯污染含水层     

秦传玉  赵勇胜  郑苇 《地球科学》2011,36(4):761-764

通过一维砂柱实验研究了阴离子表面活性剂十二烷基苯磺酸钠(SDBS)对空气扰动技术(air sparging,AS)修复氯苯污染地下水的强化效果.结果表明,SDBS的加入降低了地下水的表面张力,减小了水气两相毛细压力,从而提高了地下水中的空气饱和度.当曝气量为100 mL/min,地下水的表面张力由72.2 mN/m降至49.5 mN/m时,地下水中空气饱和度由13.2%提高至50.1%,而后随着表面张力的进一步降低,空气饱和度不再提高,反而有小幅下降.通过污染物的去除实验发现,SDBS的加入大大提高了氯苯的去除率,且去除率的变化与空气饱和度的变化趋势基本相符.因此,表面活性剂的加入可以作为空气扰动技术一种十分有效的强化手段.   相似文献   

辽东地区硼找矿概率-地球化学块体资源评价   总被引：1，自引：0，他引：1  

周永恒  张璟  徐山  李守义 《地球科学》2011,36(4):747-754

利用地球化学块体理论进行矿产资源评价的资源量预测工作中,大多是基于地球化学数据本身,虽考虑了除成矿物源之外的如地层、构造等地质背景因素的影响,但仅限于定性阶段,多用于地球化学块体含矿性的分析及远景区的分级.在充分研究地质背景因素的基础上,认为如地层、构造等富集因素与成矿物质基础是矿床形成的2个必要条件,因此,在资源量计算的工作中,还应考虑富集因素的影响,据此建立了找矿概率-地球化学块体法,并将其应用于辽东硼资源量的定量评价中.结果表明,辽东地区硼矿资源潜力较大并符合客观实际.   相似文献   

Stable carbon isotope composition of monoterpanes in essential oils and crude oils     

ZHANG DaJiang    WANG PeiRong    MAO ZhiChao & XU GuanJun  Research Institute of Petroleum Exploration & Development  PetroChina  Beijing  China  Key Laboratory of Petroleum Geochemistry  CNPC  Geochemistry Department  Yangtze University  Jingzhou 《中国科学:地球科学(英文版)》2010,(4)

Twenty-five monoterpanes from six types of essential oils and hydrogenated turpentine oil have been identified and their stable carbon isotope composition determined.Monoterpanes in essential oils sourced from terrestrial higher plants display a δ13C value in the range of-34‰-26‰,and mostly between-29‰ and-27‰.The δ13C value of any single monoterpane is very consistent in different essential oils.Acyclic monoterpanes show closer isotope composition between-28.6‰ and-26.2‰,with an average value of-27.7‰.In contrast,the isotope composition of cyclic monoterpanes is more scattered with an average value of-28.6‰.Isotopic fractionation with 13C enrichment has been observed during both artificial and geological hydrogenation of monoterpenoids to monoterpanes,and this is more obvious for the acyclic monoterpenoids.In addition to higher plants,acyclic monoterpane 2,6-dimethylheptane in crude oil can also be originated from other organic inputs.  相似文献   

Ridge subduction and porphyry copper-gold mineralization:An overview   总被引：35，自引：0，他引：35  

SUN WeiDong    LING MingXing    YANG XiaoYong  FAN WeiMing  DING Xing & LIANG HuaYing CAS Key Laboratory of Isotope Geochronology  Geochemistry  Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China  Research Center for Mineral Resources  School of Earth  Space Sciences  University of Science  Technology of China  Hefei  Graduate University of Chinese Academy of Sciences  Beijing  Key Laboratory for Metallogenic Dynamics  ... 《中国科学:地球科学(英文版)》2010,(4)

Many large porphyry Cu-Au deposits are connected to adakitic rocks known to be closely associated with ridge subduction. For example, there are several subducting ridges along the east Pacific margin, e.g., in Chile, Peru, and South America, most of which are associated with large porphyry Cu-Au deposits. In contrast, there are much fewer ridge subductions on the west Pacific margin and porphyry Cu-Au deposits are much less there, both in terms of tonnage and the number of deposits. Given that Cu and Au are...  相似文献   

Distribution and anomaly of microwave emission at Lunar South Pole     

ZHANG WeiGuo  JIANG JingShan  LIU HeGuang  ZHANG XiaoHui  ZHANG DeHai  LI DiHui & XU Chu  ong Centre for Space Science  Applications Research  Chinese Academy of Sciences  Beijing  China 《中国科学:地球科学(英文版)》2010,(3)

Investigation on Lunar polar area is almost every lunar mission’s primary objective in recent years. The rationale behind it is that illumination and ice resources in this area can be potentially very helpful for constructing lunar human base. In this paper, we analyze microwave radiometric characteristics of the Moon by using the newly acquired Chang’E-1 Lunar Microwave Sounder (CELMS) data. Microwave brightness temperature at Lunar South Pole (LSP) is distributed regularly with a style of "ring-in-ring", decreasing from equator to pole. Regolith temperature gradient is bigger at lunar equator than at polar area. Brightness temperature diurnal difference decreases with observation frequency. Microwave brightness temperature distribution maps at LSP and Lunar North Pole (LNP) have been made based on the analysis. It is found that microwave brightness temperature becomes to synchronize with elevation beyond -85° latitude. This phenomenon is related to lightening condition and indicates temperature distribution at LSP. The brightness temperature anomaly cold points are potentially cold trap areas for water or ice while hot points imply plenty of illumination resources there.  相似文献   

Meso-scale circulation at the intermediate-depth east of Mindanao observed by Argo profiling floats   总被引：1，自引：0，他引：1  

ZHOU Hui  YUAN DongLiang  GUO PeiFang  SHI MaoChong & ZHANG QiLong Key Laboratory of Ocean Circulation  Wave Studies  Chinese Academy of Sciences  Qingdao  China  Physical Oceanography Laboratory  Ocean University of China  Qingdao 《中国科学:地球科学(英文版)》2010,(3)

The meso-scale circulation at the intermediate depth east of Mindanao is studied using Argo profiling floats observations. The trajectories and the parking-depth velocities of Argo floats show that the intermediate-depth circulation east of Mindanao contains significant meso-scale features that are highly variable both in space and in time. Both cyclonic and anticyclonic eddies at the intermediate depth (1000–2000 m) are indicated by the trajectories east of Mindanao. The mean tangential velocities of these eddies are about 10 cm/s at 2000 m and over 20 cm/s at 1000 m, which indicates that the geostrophic calculation may contain large errors due to the vigorous eddy activity at the reference levels. The analyses also suggest that these eddies might play an important role in mass and vorticity balances of the intermediate-depth circulation east of Mindanao.  相似文献   

Principal aspects of the Ordovician biotic radiation     

ZHANG Yu  ong  ZHAN RenBin  FAN JunXuan  CHENG JunFeng & LIU Xiao LPS  Nanjing Institute of Geology  Palaeontology  Chinese Academy of Sciences  Nanjing  China 《中国科学:地球科学(英文版)》2010,(3)

The Ordovician radiation is among the major bioevents in earth history that have drawn great attention from geologists all over the world, and there have been hundreds of publications treating various aspects of this radiation. The study of the event involves a broad spectrum of research fields and concerns many scientific questions. Many opinions and hypotheses have been proposed on the triggering and controlling factors of the radiation. Herein the authors critically review the study of the Ordovician rad...  相似文献   

Fast and dynamic generation of linear octrees for geological bodies under hardware acceleration     

DENG Hao    ZHANG LiQiang  MAO XianCheng  MA JingTao  KANG ZhiZhong  PENG JunHuan  RUI XiaoPing & LIU Liu State Key Laboratory of Remote Sensing Science  Beijing Normal University  Beijing  China  School of Geoscience  Environmental Engineering  Central South University  Changsha  PTV America  Inc. Broadway Plaza Ste  Tacoma  WA  USA 《中国科学:地球科学(英文版)》2010,(1)

In the application of 3D Geoscience Modeling,we often need to generate the volumetric representations of geological bodies from their surface representations.Linear octree,as an efficient and easily operated volumetric model,is widely used in 3D Geoscience Modeling.This paper proposes an algorithm for fast and dynamic generation of linear octrees of geological bodies from their surface models under hardware acceleration.The Z-buffers are used to determine the attributes of octants and voxels in a fast way,a...  相似文献