岩盐中不溶物含量对储气库腔体有效空间大小的影响     

高树生  班凡生  单文文  熊伟 《岩土力学》2005,26(Z2):179-183

主要研究了岩盐不溶物含量对岩盐储气库水溶建腔有效空间大小的影响。根据水溶建腔机理,建立岩盐储气库水溶建腔数学模型,通过岩盐溶腔数学模型,分别对岩盐中不溶物含量不同的地层条件下,岩盐储气库水溶建腔进行动态模拟数值计算,综合分析岩盐中不溶物含量对岩盐储气库水溶建腔的影响规律。  相似文献   

Bivariate frequency analysis of nonstationary low‐flow series based on the time‐varying copula          下载免费PDF全文

Cong Jiang  Lihua Xiong  Chong‐Yu Xu  Shenglian Guo 《水文研究》2015,29(6):1521-1534

Many studies have analysed the nonstationarity in single hydrological variables due to changing environments. Yet, few researches have been done to investigate how the dependence structure between different individual hydrological variables is affected by changing environments. To investigate how the reservoirs have altered the dependence structure between river flows at different locations on the Hanjiang River, a time‐varying copula model, which takes the nonstationarity in the marginal distribution and/or the time variation in dependence structure between different hydrological series into consideration, is presented in this paper to perform a bivariate frequency analysis for the low‐flow series from two neighbouring hydrological gauges. The time‐varying moments model with either time or reservoir index as explanatory variables is applied to build the time‐varying marginal distributions of the two low‐flow series. It's found that both marginal distributions are nonstationary, and the reservoir index yields better performance than the time index in describing the nonstationarities in the marginal distributions. Then, the copula with the dependence parameter expressed as a function of either time or reservoir index is applied to model the variable dependence between the two low‐flow series. The copula with reservoir index as the explanatory variable of the dependence parameter has a better fitting performance than the copula with the constant or the time‐trend dependence parameter. Finally, the effect of the time variation in the joint distribution on three different types of joint return periods (i.e. AND, OR and Kendall) of low flows at two neighbouring hydrological gauges is presented. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Non-isothermal kinetic analysis of thermal decomposition of the Ca-bentonite from Santai,China     

Xiang-hui Zhang  Chuan He  Ling Wang  Zhong-quan Li  Miao Deng  Jing Liu  Hong-kui Li  Qian Feng 《Mineralogy and Petrology》2015,109(3):319-327

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Progress in Research Methods on “Fluid-Diagenesis” Interactions of Fractures in Tight Reservoirs     

WANG Xintao  CHEN Yong  ZHOU Yaoqi  YUE Huiwen  HE Chuan 《《地质学报》英文版》2015,89(Z1):422-424

<正>1 Introduction Fractures in tight reservoirs have always attracted general petroleum geologists’attentions due to their importance in the processes of hydrocarbon enrichment and oil-gas exploration.Fractures can not only act as main pathways of hydrocarbon migration and fluid flow,but also provide major reservoir spaces for hydrocarbon  相似文献   

Luminescence dating of Late Pleistocene faults as evidence of uplift and active tectonics in Sardinia,W Mediterranean     

Leonardo Casini  Stefano Andreucci  Daniele Sechi  Chun‐Yuan Huang  Chuan‐Chou Shen  Vincenzo Pascucci 《地学学报》2020,32(4):261-271

Precise dating of the activity of Late Pleistocene to Holocene neo‐tectonic structures is crucial to quantify the rate of deformation in low‐seismicity regions. Sardinia is a relatively stable continental fragment set in the middle of the tectonically active Western Mediterranean belt. This paper provides evidences of significant uplift of northwest Sardinia that support an ongoing tectonic activity since the Marine Isotopic Stage 7 (MIS 7; ca. 220 ka). In particular, it documents for the first time Late Pleistocene to Holocene tectonics based on luminescence dating of travertine sealing a major NNE‐SSW fault.  相似文献   

一种循序渐进的无人机航测实践教学模式     

蔡鹏  岳雄  李笑瑜  艾慧丽  戚文杰  杨文杰 《北京测绘》2021,35(11):1484-1488

以有效培养学生实践能力为目标,提出了一种循序渐进的无人机航测实践教学模式,分为基本能力实训和强化能力实训.基本能力的外业实训通过无人机地面站设置2D航线以获取垂直影像,内业实训利用数字摄影测量网格系统(Digital Photogrammetric Grid,DPGrid)软件生产数字高程模型(Digital Elevation Model,DEM)、数字正射影像(Digital Orthophoto Map,DOM)、数字线划地图(Digital Line Graphic,DLG),Pix4Dmapper软件生产数字地表模型(Digital Surface Model,DSM)、DOM,DPGrid软件分模块按步骤执行且人机交互多,更适合学生基本能力的实践教学;强化能力的外业实训通过无人机地面站设置3D航线以获取倾斜影像,内业实训通过Agisoft Metashape和ContextCapture软件进行倾斜影像处理,生产3D模型,ContextCapture软件的三维重建效果好,Agisoft Metashape软件的分模块按步骤执行过程详细,更适合学生强化能力的实践教学.  相似文献   

基于ArcGIS API for JavaScript的辅助决策地图变化信息联动系统开发     

方川  黄洪纤 《测绘与空间地理信息》2021,44(3):30-32,35

以天地图提供的地图服务为基础,结合现代计算机技术、网络技术以及地理信息技术,基于ArcGIS APIfor JavaScript开发出辅助决策地图变化信息联动系统,提供地图变化信息的增删改、审核、上传、下载及管理等联动功能,实现了省市县级业务部门对地图变化信息的科学管理,提升了辅助决策地图服务保障水平.  相似文献   

Observation and estimation of photosynthetic photon flux density in Southern China     

Zhongmin Zhu  Lunche Wang  Wei Gong  Yu Xiong  Bo Hu 《Theoretical and Applied Climatology》2015,120(3-4):701-712

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晚三叠世中卡尼期极端气候事件:研究进展及存在问题   总被引：1，自引：0，他引：1  

金鑫  时志强  王艳艳  段雄  程明 《沉积学报》2015,33(1):105-115

作为三叠纪最显著的气候变化事件,全球性的卡尼期气候事件以幕次降雨量增多为特征,在西北特提斯洋地区表现较为明显,主要反映了从碳酸盐岩到黑色页岩的岩性变化,近年来这一地质事件在美国、中国、日本等地的卡尼阶地层中也有识别.其成因一直是学者研究的重点,有人认为是板块构造运动促使大气或大洋循环发生了变化,或是超级大陆聚合碰撞而触发大火成岩省喷发致使全球气候发生了紊乱,也有人认为是地球系统综合因素相互作用的结果.联系到中国西南部地区卡尼阶现状,认为超级季风、构造运动和卡尼期气候变化的关系值得深入研究,此外卡尼期气候事件过程中碳酸盐补偿深度上升问题、卡尼期黑色页岩事件反映的大洋生产力以及多幕卡尼期气候事件反映的气候波动事件等科学问题也是今后的研究中值得重视的.  相似文献   

安徽庐江泥河铁矿床蚀变-矿化作用及元素迁移规律          下载免费PDF全文

江满容  张均  刘文浩  熊索菲 《地球科学》2015,40(6):1034-1051

传统方法不能明确揭示泥河铁矿床多阶段热液叠加蚀变过程中元素迁移的继承性特征.运用等浓度图法(the isocon diagram),根据该区晚阶段蚀变都是叠加在稍早阶段蚀变之上的实际情况,采用早期蚀变岩石为原岩与稍晚期蚀变岩石的不活动元素拟合最佳等浓度方程,定量揭示主量元素在热液蚀变过程的迁移规律.研究表明,泥河铁矿床阳离子的沉淀顺序大致为:Na→Ca、Mg、Fe、P→Ca、Fe→Al、Si.从早到晚,元素的带入和带出是连续互补的,蚀变矿化作用是一个连续的过程.钠长石的大量出现是Na质沉淀的标志,代表铁矿化的开始;膏辉岩化是Ca、Mg、Fe质沉淀的表现形式,为磁铁矿体的近矿和容矿蚀变;次生石英岩化、高岭石化是早期迁移出的Al、Si质沉淀的结果,是磁铁矿化远程指示性蚀变.   相似文献