内蒙古科尔康油田沙海组储集层的岩石学特征   总被引：1，自引：0，他引：1  

刘林玉  叶俭 《西北地质科学》1997,18(1):46-49

根据碎屑岩铸体薄片和扫描电镜观察分析资料，研究了科尔康油田沙海组储集层的岩石学特征。科尔康油田沙海组储集层的岩石类型主要为岩屑砂岩和岩屑砂砾岩。碎屑岩的岩性特征对沙海组储集层的成岩作用具有显著的影响作用。  相似文献   

Flexible spectral methods for the generation of random fields with power-law semivariograms     

Johannes Bruining  Diederik van Batenburg  Larry W. Lake  An Ping Yang 《Mathematical Geology》1997,29(6):823-848

Random field generators serve as a tool to model heterogeneous media for applications in hydrocarbon recovery and groundwater flow. Random fields with a power-law variogram structure, also termed fractional Brownian motion (fBm) fields, are of interest to study scale dependent heterogeneity effects on one-phase and two-phase flow. We show that such fields generated by the spectral method and the Inverse Fast Fourier Transform (IFFT) have an incorrect variogram structure and variance. To illustrate this we derive the prefactor of the fBm spectral density function, which is required to generate the fBm fields. We propose a new method to generate fBm fields that introduces weighting functions into the spectral method. It leads to a flexible and efficient algorithm. The flexibility permits an optimal choice of summation points (that is points in frequency space at which the weighting function is calculated) specific for the autocovariance structure of the field. As an illustration of the method, comparisons between estimated and expected statistics of fields with an exponential variogram and of fBm fields are presented. For power-law semivariograms, the proposed spectral method with a cylindrical distribution of the summation points gives optimal results.  相似文献   

青藏高原唐古拉山冬克玛底河流域水文过程特征分析   总被引：16，自引：16，他引：16  

张寅生  太田岳史 《冰川冻土》1997,19(3):214-222

利用１９９３年５￣９月连续时间序列的资料，对青藏高原唐古拉山冬克玛底冰川区及其流域的水文过程特征进行初步分析。由于青藏高原季风环流的影响，在性质不同气团控制所产生的降水天然过程的降水量差别极大，该区域主要降水集中在６￣８月，Ｔｒｅｔｙａｋｏｖ雨量器对标准雨量器捕捉率的修正量小于天山地区的研究结果，该流域地面蒸发过程较为强盛，各种下垫面的蒸发量占流域水量平衡收入的３７％，土壤蒸发量与水面蒸发和土壤含  相似文献   

郑州国际会展中心展厅钢屋盖的动力特性分析   总被引：7，自引：1，他引：7  

任俊超  童丽萍  赵轶西 《世界地震工程》2004,20(1):70-74

郑州国际会展中心展览厅钢屋盖采用了空间斜拉式索拱结构体系，为探讨该体系的动力特性，采用ANSYS有限元程序，分别建立钢屋盖与下部混凝土结构共同作用、钢屋盖单独作用以及无斜拉系统的钢屋盖单独作用时的3个空间计算模型，采用子空间迭代法计算其自振周期和振型，并加以比较。从而得出钢屋盖的动力特性，为进一步研究此类结构的受力特性奠定了基础。  相似文献   

EXPERIMENTAL STUDY ON EFFECTS OF HUMIDITY AND CHEMICAL COMPOSITION UPON IMAGINARY PART OF REFRACTIVE INDEX OF AEROSOL PARTICLES^*          下载免费PDF全文

LI Zihu  DONG Zhen  YANG Jun  HUANG Shihong 《Acta Meteorologica Sinica》2004,18(4):517-526

Experimental study is made of the relationship between the imaginary part of refractive index (IRI) of atmospheric aerosol particles and relative humidity,and between IRI and chemical element through the assay of chemical constituents of the particles.Evidence suggests that atmospheric humidity and aerosols' chemical ingredients have great effects on the IRI's and they should thus be considered in the research of the radiation properties of the particles in the atmosphere.  相似文献   

金沙江下游白鹤滩水电站岩体结构的建造特征     

王奖臻  黄润秋  许模 《地球科学进展》2004,(Z1)

拟建的白鹤滩水电站的坝基为峨眉山玄武岩。峨眉山玄武岩由火山熔岩类、火山碎屑熔岩类、火山碎屑岩类和沉积火山碎屑岩类所组成。火山熔岩又可划分为斜斑玄武岩、块状玄武岩和杏仁状玄武岩;火山碎屑岩包括集块岩、火山角砾岩以及凝灰岩;而沉积火山碎屑岩类则由沉火山角砾岩和沉凝灰岩所组成。不同类型岩石的结构构造、矿物成分和形成环境不同,导致它们的岩石力学性质和工程性能也不相同。块状玄武岩、斜斑玄武岩和沉积火山碎屑熔岩的抗压强度和抗风化能力都比较大,因而具有很好的工程地质稳定性;杏仁状玄武岩、火山碎屑熔岩的抗压强度稍低,但抗风化能力很好,因此也具有较好的工程地质稳定性;而火山碎屑岩包括火山角砾岩、凝灰岩的抗压强度和抗风化能力都很低,往往形成岩体中的软弱夹层,工程地质稳定性较差。  相似文献   

长春市城市土壤中重金属元素的积累及其微生物特性研究   总被引：10，自引：2，他引：10  

刘乃瑜  马小凡  谢忠雷  郭平 《吉林大学学报(地球科学版)》2004,(Z1)

由于人为活动的影响,长春市城市土壤中重金属Cu、Zn、Pb、Cd已有了显著积累。在重金属的胁迫下,土壤微生物特征发生了明显变化,微生物代谢活动明显增强,但微生物生物量却有较大的降低。微生物生理生态参数土壤微生物量碳与总有机碳的比值(Cmic/Corg)和代谢商QCO2(微生物呼吸作用强度与微生物量碳的比值)变化异常。研究表明,微生物特性可作为城市土壤环境中重金属含量变异的有效指标。  相似文献   

石油污染对冻土热传导的影响     

Zhuravlev Igor Igorevich 《冰川冻土》2004,26(Z1):128-132

Complex experimental research of thermal properties of oil-contaminated frozen soils was carried out. On the basis of the obtained results the influence of the various factors connected with oil pollution on heat transfer in frozen soils was analyzed. And the model of heat transfer in frozen soils was offered.  相似文献   

Experimental research on reservoir sensitivity to stress and impacts on productivity in Kela 2 Gas Field     

Sun Longde  Song Wenjie  Jiang Tongwen 《中国科学D辑(英文版)》2004,47(Z2)

Kela 2 Gas Field, with high formation pressure (74.35MPa), high pressure coefficient (2.022) and difficulty of potential test and evaluation, is the largest integrated proved dry gas reservoir in China so far and the principal source for West-East Gas Development Project. In order to correctly evaluate the elastic-plastic deformation of rocks caused by the pressure decline during production, some researches, as the experiment on reservoir sensitivity to stress of gas filed with abnormal high pressure, are made. By testing the rock mechanic properties, porosities and permeabilities at different temperature and pressure of 342 core samples from 5 wells in this area, the variations of petro-physical properties at changing pressure are analyzed, and the applicable inspection relationship is concluded. The average productivity curve with the reservoir sensitivity to stress is plotted on the basis of the research, integrated with the field-wide productivity equation. The knowledge lays a foundation for the gas well productivity evaluation in the field and the gas field development plan, and provides effective techniques and measures for basic research on the development of similar gas fields.  相似文献   

黄河流域分布式水文模型初步研究与进展   总被引：36，自引：2，他引：36       下载免费PDF全文

刘昌明  夏军  郭生练  郑红星  王中根  吴险峰  郝芳华 《水科学进展》2004,15(4):495-500

结合国家重点基础研究规划项目"黄河流域水资源演化规律与可再生性维持机理"的研究,综述了黄河流域分布式水文模型研究的主要进展,包括分布式水文模型的特点和基本结构、分布式水文模型中的数字高程模型(DEM)和水文学基础、地理信息系统(GIS)和遥感(RS)在分布式水文模拟中的应用等方面的内容,对未来分布式水文模型的研究提出几点认识。  相似文献