我国高山土壤分类研究的进展     

高以信 《山地学报》1990,(1)

在回顾了我国高山土壤分类后,概述了高山土壤的诊断层和诊断特性,阐述了土壤分类命名原则,提出了新的高山土壤分类系统以及涉及这些土壤的土纲及其以下级别的检索。  相似文献   

Some early Russian studies of subsurface storm‐flow processes     

V. U. Smakhtin 《水文研究》2002,16(13):2613-2620

Subsurface flow is an important component of the catchment hydrological cycle. Various mechanisms of this process and their role in storm‐flow generation attracted the attention of many researchers throughout the twentieth century. The results of most of these studies are well documented. However, similar studies conducted in the past by many Russian hydrologists have never been made available to the English speaking hydrological community. This paper attempts to fill this gap and briefly review some of these investigations, focusing on their main results. It starts with the review of the early experimental studies (after 1930s–1950s), which allow the main characteristics of subsurface storm flow to be established. This is followed by a review of the research conducted in 1960s, which resulted in some conceptualization of the subsurface flow mechanisms. The paper also draws some parallels between this, mostly unknown, subsurface flow research in Russia and the better‐known contemporary studies of this process. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

Comparative Study of Gacun and Youre Silver–Lead–Zinc–Copper Deposits in Sichuan, SW China, and their Mineralization Significance     

DANG Yuan  CHEN Maohong  FU Bin  XUE Zhiqiang 《《地质学报》英文版》2018,92(1):162-182

The large Gacun silver–lead–zinc–copper deposit in Sichuan Province is one of the largest volcanogenic massive sulfide(VMS) deposits in China. The deposit consists of western and central ore bodies, which form a vein–stockwork mineralization system corresponding to hydrothermal channels, and eastern ore bodies, which form an exhalative chemical sedimentary system derived from a brine pool in a submarine basin. The Youre lead–zinc deposit, which is currently under exploration and lies adjacent to the southern part of the Gacun deposit, is characterized by intense silicification and vein–stockwork structures and consists of massive silicified rhyolitic volcanics, banded rhyolitic tuff, and phyllitic sericite tuff. From a comparison of their ore-bearing horizons, the Gacun and Youre deposits have a continuous and stable hanging wall(calcareous slate and overlying andesite) and foot wall(rhyolite–dacite breccia and agglomerate), and the lithologic sequence includes lower intermediate to felsic rocks and upper felsic rocks. Thus, the Youre deposit, which comprises relatively thinly layered low–grade ore, is regarded as forming a southward extension of the Gacun deposit. A further comparison of the structures of the ore-bearing belts between the two deposits suggests that the Youre ore bodies are similar to the western ore bodies of the Gacun deposit. Moreover, the characteristics of fluid inclusions and stable isotopes in the Youre deposit are also similar to those of the western ore bodies of the Gacun deposit. Genetic models of the deposits are proposed for the Gacun–Youre ore district, and massive concealed ore bodies may occcur in the Youre deposit at depths that are similar to those of the eastern ore bodies of the Gacun deposit.  相似文献   

中国剑龙类的发展史和演化     

郝宝鞘  彭光照  秦钢  叶勇  江山 《地质通报》2018,37(10):1777-1782

剑龙类恐龙是一类长有骨板的中-大型有甲类恐龙。其最明显的特征是从颈部到尾部沿背脊有两列直立的骨板,呈对称或交错排列。已知最早的剑龙类恐龙发现于中侏罗世的欧洲和中国,在侏罗纪末期剑龙类迅速繁衍,在全球都有分布,但随后在白垩纪早期开始消亡。中国至今所发现的剑龙类恐龙化石有几十个个体材料,发表的属种共计9属10种,分别为嘉陵龙、乌尔禾龙、芒康龙、营山龙、华阳龙、沱江龙、重庆龙、巨棘龙,将军龙。从地层分布、头部、腰带、肢骨比值和骨板几个特征来看,中国剑龙类应该有一个从华阳龙-重庆龙-巨棘龙-沱江龙-营山龙-芒康龙-乌尔禾龙的演化过程。  相似文献   

基于GPS基线向量计算机场跑道真方位角     

朱晓江 《全球定位系统》2014,39(4):91-93

本文介绍了GPS相对静态定位测量结合站心地平直角坐标系计算跑道真方位角的方法,通过坐标方位角加上改正值计算真方位角的方法进行验证,结合工程实例对该方法进行验证。该方法计算过程简单,可靠性好,省时省力。  相似文献   

影响金属矿勘查中土壤测量效果的主要问题探讨     

汤正江  程治民  赖柏生  梁昌阔  焦彦军  陈雷  陶耐  唐伟  毛宇迪 《安徽地质》2014,(1):53-55

国内外实践证明,用于金属矿勘查的常规土壤地球化学测量是一种经济快速有效的勘查手段之一。但是实际工作中一些直接影响其工作效果的技术问题往往被忽视,造成其结果与客观实际不符,严重制约了该方法在金属矿勘查中的作用发挥。笔者仅就自己的一些工作经验和粗浅认识,对影响用于金属矿勘查的土壤地球化学测量工作效果的7个主要技术问题进行总结探讨,以供参考。  相似文献   

合成地震记录标定反射层位方法简析     

屈绍忠 《中国煤炭地质》2013,(7)

地震层位的标定是地震勘探构造解释的基础,合成地震记录与井旁道对比是层位标定的一个主要方法。层位标定精度除了受地震资料本身的质量及测井资料质量影响之外,制作合成地震记录的准确性取决于地震剖面极性、反射系数、平均速度、地震子波等关键因素的精度。通过介绍确定各种参数的关键技术,提出了在标定地震发射层位中采用的具体方法和标准,如利用相关系数对比时相关系数应大于0.6;利用平均速度对比确定的人工合成地震记录与实际剖面形态差异较小;时深调整前后测井曲线在形态上不应存在差异等。另外为提高对比精度,对目的层段时深关系进行调整时,应结合其他资料,如电性曲线、岩性剖面及钻井地质分层等信息,使之符合地质规律。  相似文献   

渤海海域锦州25-1油田地震勘探技术难点及对策     

张志军  徐长贵 《海洋地质前沿》2014,30(11):52-57

针对辽西低凸起古近系圈闭地震研究中存在的几个技术难点提出了相应的研究路线,实现了对该区构造和储层的精细描述。研究以先进的综合地震工作站为平台,以地震解释为中心,与地质、测井研究密切配合,应用多项地震勘探新技术对地震数据体进行分析研究。应用地震地质多信息综合标定技术,实现了地震层位的精确标定;基于地质模型约束的变层速度模型保证了时深转换的准确性;虚拟现实与三维可视化技术相结合的全三维地震解释贯穿地震研究的全过程;以运用基于自组织人工神经网络分析(SOM)和主成分分析(PCA)的地震相分析技术对地震属性及所反映的地质特征进行分析解释,得到与地震相相对应的沉积相,大大提高了储层研究的精确度和可信度。锦州25区实际钻探结果表明所提出的几种技术方法组合能够有效地解决该区地球物理研究中存在的主要问题。  相似文献   

沁水盆地黄土塬区三维地震勘探激发层位试验研究     

段天柱 《地质与资源》2019,28(3):309-314

沁水盆地黄土塬区地表黄土覆盖厚度不均,地震波速度差异较大,对地震勘探的激发有较大的影响.针对区域地表地层特点,设计地震地质模型,分析不同激发层位地震正演记录.结合试验区现场试验,对比分析了正演模拟记录.结果表明,合理的激发层位能够有效压制干扰波,突出目的层位反射波,提高黄土塬区三维地震原始资料的品质.  相似文献   

多层系油气藏时移地震匹配处理技术     

高云峰  王宗俊  李绪宣  胡光义  范廷恩  张晶玉  朱振宇 《物探与化探》2019,(1):183-188

针对多层系油气藏开发过程中时移地震时差、相位、频率和能量累积效应所导致的处理难题,文中提出了基于多标准层的时移地震分层匹配处理技术。该技术通过选择多层系油气藏顶部、内部和底部稳定的非储层或未动用储层作为参考标准层,进行分层系匹配处理,能够有效消除多层系油气藏时移地震累积效应的影响。通过南海X油田的实际应用,取得了较好效果。  相似文献