吉林大安油田储层裂缝的综合评价   总被引：4，自引：0，他引：4  

曾联波  高绍清 《高校地质学报》1998,4(4):459-464

本文在岩芯描述和三维有限元数值模拟的基础上,对大安油田裂缝的分布特征,发育规律,分组裂缝所起作用及其对开发的影响等方面进行了综合评价。大安油田储层中发育了受沉积微相和构造控制的四组裂缝。  相似文献   

湖南宝山铜钼铅锌银多金属矿田围岩蚀变与矿化分带特征   总被引：9，自引：2，他引：7  

杨国高  陈振强 《矿产与地质》1998,12(2):96-100

宝山铜钼铅锌银矿田主要由中部、东部、西部和北部４个矿床组成,属岩浆期后高中温含矿热液接触交代矽卡岩型铜钼金属铋矿床、中低温热液充填交代铅锌银矿床。矿田围岩蚀变强烈,并与矿化关系密切,具有以岩体为中心向外呈现明显的围岩蚀变和矿化分带特征,可作为找矿的重要标志。  相似文献   

Flow in an aquifer charged with hot water from a fault zone     

J. W. Pritchett  S. K. Garg 《Pure and Applied Geophysics》1978,117(1-2):309-320

Many geothermal anomalies are intersected by vertical fault zones (narrow zones of fractured material with large effective permeability). These conduits are probably responsible for much of the upwelling of hot water from depth. This paper considers a shallow aquifer intersected by a vertical fault. The fluid flow in the aquifer is numerically modeled as a two-dimensional problem. It is observed that the temperature distribution in the aquifer is governed primarily by lateral flow of hot water supplied from the intersecting vertical fault and only secondarily by conduction. The numerical results also provide a possible explanation for the local temperature maxima and inversions occasionally observed in borehole measurements. The present model is an alternative to that based on mushroom-shaped isotherm distributions found in high Rayleigh number large-scale circulation cell calculations.  相似文献   

9711号台风的移动路径和影响山东的特大暴雨分析   总被引：5，自引：2，他引：3  

陈秀杰  顾润源  耿勃  杨晓霞 《气象》1998,24(4):46-49

对９７１１号台风的移动路径及其造成的暴雨进行了分析。分析表明,副高外围环流在台风移动过程中有明显的引导作用;台风的移动路径和暴雨落区与正涡度轴线及高能轴线都有较好的对应关系;对流层中层变能场的分布对台风移动路径有明显的预报指示意义。  相似文献   

CONCENTRATION AND FLUX OF CO_2, TURBULENCE FLUXES AND RADIATION BALANCE IN THE NEAR SURFACE LAYER OVER WHEAT FIELD     

刘树华  Leclerc.M.Y.  徐梅  麻益民 《Acta Meteorologica Sinica》1998,(2)

The gradient of CO_2 concentration, photosynthetically active radiation (PAR). net radiation.soil heat flux, profiles of wind speed, and air temperature and humidity were measured above awheat field during May and June 1985 at Beijing Agro-Ecosystems Experimental Station. Beijing,China. Fluxes of carbon dioxide, sensible heat, latent heat and momentum were calculated byusing the aerodynamic method. The observation site. equipment, calibration techniques, theerrors associated with the measurement, and the computational procedures are described. Theresults show that the diurnal variations of amplitude of CO_2 concentrations were 103.8 to 27. 0. 86.3 to 22.8 and 69.8 to 11.6 ppm: the average CO_2 concentrations were 331.5. 339.9 and 364.6 ppmfor the photosynthesis type, and 369.6. 364.0 and 375.2 ppm for the respiration type at 1. 2 and10 m above surface, respectively, from May 14 to June 15. In the daytime, transfer direction ofthe CO_2 fluxes and gradients is from air to crop canopy, and at noon (1100 to 1300 BT (BeijingTime)) the transfer rate reaches negative maximum value. At night, transfer of CO_2 fluxes andgradients is in the reversed direction and reaches positive maximum in the early morning (0400 to0600 BT). There are strong negative correlations between CO_2 flux and the net radiation (Rn),available energy (H LE). photosynthetically active radiation (PAR) and momentum flux (τ).  相似文献   

初值形成方法对降水数值预报的影响     

俞小鼎 《高原气象》1998,17(3):310-316

北欧有限区域模式ＨＩＲＬＡＭ被应用于中国的暴雨个例以探讨初值形成方法对有限区域模式定量降水数值预报的影响,对两种初值形成方案进行了对比,一种是由ＨＩＲＬＡＭ自己的数值同化系统提供初值,另一种是直接内插ＥＣＭＷＦ全球模式的相应分析场,与这两种方案对应的数值试验分别是控制试验（ＣＯＮＬ）和对比试验（ＣＯＭＰ）,将ＣＯＮＬ和ＣＯＭＰ的降水预报与观测值比较,结果表明：（１）当为ＣＯＭＰ提供初值的ＥＣＭＷＦ  相似文献   

一次弓状降雹回波区流场的反演     

胡明宝  刘俄  汤达章 《热带气象学报》1998,14(3):282-288

通过对一次典型弓状降雹回波区的流场进行反及特点分析,发现用矩不变量法反演出的回波区流场结构,与藤田关于弓状回波的概念模式非常吻合,利用该方法估测出的流场,散度场、涡度场所表现出的信息,与降雹实况是一致的,该研究可为中小尺度强天气的监测,提供高时空分辨率的流场资料。  相似文献   

夏季西北干旱气候形成的数值模拟——高原地形和环流场等的影响   总被引：16，自引：2，他引：14  

钱正安  吴统文  吕世华  焦彦军 《大气科学》1998,22(5):753-762

为了进一步检验和修改本文部分作者先前初步提出的影响夏季西北干旱气候形成的因子及如何相互作用形成西北干旱气候的物理图像,本文继续用一全球大气环流谱模式,设计了5组试验,利用ECMWF 的格点分析值资料,进行了数值模拟。结果表明,青藏高原隆升和环流差异是形成西北干旱气候的重要因子,已提出的西北干旱气候形成的物理图像大体是正确的。  相似文献   

Dynamics of Axisymmetric Truncated Dynamo Models     

Covas  E.  Tavakol  R. 《Studia Geophysica et Geodaetica》1998,42(3):356-363

An important question regarding the study of mean field dynamo models is how to make precise the nature of their underlying dynamics. This is difficult both because relatively little is known about the dynamical behaviour of infinite dimensional systems and also due to the numerical cost of studying the related partial differential equations. As a first step towards their understanding, it is useful to consider the corresponding truncated models. Here we summarise some recent results of the study of a class of truncated axisymmetric mean field dynamo models. We find conclusive evidence in these models for various types of intermittency as well as multiple attractors and final state sensitivity. We also find that the understanding of the underlying dynamics of such dynamo models requires the study of a new class of dynamical systems, referred to as the non-normal systems. Current work demonstrates that these types of systems are capable of a novel type of intermittency and also of relevance for the understanding of the full axisymmetric PDE dynamo models.  相似文献   

Central Europe: Active or residual tectonic stresses     

Gerhard Greiner  J. Henning Illies 《Pure and Applied Geophysics》1977,115(1-2):11-26

The regional stress field in the Western Alps and their northern foreland has been investigated byin situ stress determinations. More than 600 strain relief measurements were made with resistance strain gages in boreholes carried out in mines, tunnels and quarries. The stresses calculated and data obtained from other papers were used to get a detailed idea of the stress conditions in Central Europe.The measurements confirm a continuous flux of compressive stress from the Alps to the northern foreland east of the Rhinegraben. The largest stresses are observed in the Central Alps, the lowest in the Rhinegraben rift system. The horizontal stresses exceed at nearly all places the vertical ones. Evidently the excess of horizontal stress is generated by active plate tectonics in the Alps. A tectonic model to explain the observed stress pattern is presented.  相似文献