辽宁红阳煤田石炭—二叠纪聚煤期古地理与控煤分析     

张新福  逄礡  马金利  周效志 《中国煤炭地质》2010,(7):1-6,15

依据华北地台晚古生代陆表海沉积建造层序界面的识别标志,在红阳煤田石炭—二叠系残余地层中识别出了6个层序界面,并据此建立了由DS1-DS55个三级层序构成的层序地层格架,揭示了红阳煤田石炭—二叠纪沉积环境由海相到陆相演化的过程。DS1-DS5层序地层岩性岩相分析表明:DS2、DS3层序是石炭—二叠纪主要聚煤期。DS2层序发育堡岛体系,岛后泥炭坪与滨岸沼泽相沉积在区内形成了厚度较大且连续性较好的12、13煤;DS3层序发育三角洲体系,泛滥盆地与分流间湾相沉积发育了多层不可采或局部可采煤层。与DS3层序海陆过渡相沉积成煤相比,DS2层序海相沉积煤层的灰分与硫分相对较高,且在区域上都呈现由北向南逐渐升高的趋势,这与海水退出红阳煤田的方向相吻合,表明红阳煤田石炭—二叠纪聚煤期古地理格局对煤层发育及煤质特征具有明显的控制作用。  相似文献   

利用透明度进行时空信息可视化     

艾波  唐新明  艾廷华  汪汇兵 《武汉大学学报(信息科学版)》2012,37(2):229-232,259

利用电子地图中透明度视觉变量产生的虚实感,在对当前焦点时刻时空内容进行完全表达的同时,以不同透明度图形对时间上下文中的内容进行辅助表达,实现兼顾焦点时刻和时间上下文的时空可视化。该方法能够从时间全局上描绘时空对象的时间分布和时态关系,帮助把握时空发展的趋势和规律,同时更加高效地利用地图幅面,时空信息量更加丰富。  相似文献   

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea   总被引：2，自引：0，他引：2  

Hui Xie  Di Zhou  Xiong Pang  Yuanping Li  Xiangjie Wu  Ning Qiu  Pengchun Li  Guanghao Chen 《Marine Geophysical Researches》2013,34(3-4):159-173

Recent exploration revealed the high potential for hydrocarbon in the deepwater sags, Pearl River Mouth Basin, northern South China Sea. This paper reports its Cenozoic sedimentary evolution through backstripping of high precision depth data of interpreted sequence boundaries. Local backstripping parameters were mapped based on well and geophysical data. Sensitivity analysis indicates that the reliability of decompaction results were largely improved by using the local porosity parameters and the lithological parameters that vary with grid nodes. Maps of sedimentation rates of 17 sequences from 65 Ma to the present were constructed, showing the spatial–temporal variation of the sedimentation rate. Three rapid depositional stages, 65–32, 29–23.3, 18.5–10.5 Ma, and three slow depositional stages, 32–29, 23.3–18.5, 10.5–0 Ma, were identified with abrupt changes of sedimentary patterns. The three rapid depositional stages were in accord with syn-rifting stage, the first post-rifting depositional stage, and the second post-rifting depositional stage, respectively. And the three slow depositional stages were in keeping with three tectonic events respectively. Several significant sedimentary discontinuities at 32, 23.3 and 10.5 Ma were observed and discussed. The comparison between the study area and the ODP Site 1148 at 32–23.3 Ma indicates that before ~29 Ma the ODP Site 1148 was at similar sedimentation regime as that in the Baiyun and Liwan sags, but significant diversity appeared after ~29 Ma, when a large quantity of terrigenous sediments was trapped by strong post-rifting subsidence in the Baiyun and Liwan sags and could not reach the lower slope areas. Study revealed that the most rapid accumulation from 18.5 to 17.5 Ma might be mainly owing to the large sediment supply during this strong monsoon period.  相似文献   

荣成湾毗邻海域浮游动物群落季节分布特征   总被引：2，自引：0，他引：2  

刘萍  宋洪军  傅明珠  王晓  张学雷  蒲新明 《海洋学报》2013,35(4):168-175

利用2009年度4个季度月的现场调查资料研究了荣成湾毗邻海域浮游动物群落的季节分布特征。研究表明, 在荣成湾毗邻海域出现的浮游动物共59个种类, 秋季、夏季和春季浮游动物均为30种以上(依次为38种、35种和32种), 而冬季种类数相对较少(22种)。浮游动物优势种主要为强壮箭虫(Aidanosagitta crassa)、中华哲水蚤(Calanus sinicus)、小拟哲水蚤(Paracalanus parvus)和拟长腹剑水蚤(Oithona similis)等种类, 其个体丰度的空间和季节分布特征差异较大。浮游动物湿重生物量冬季最高(433.8 mg/m3), 春季(220.7 mg/m3)和秋季(162.4 mg/m3)次之, 而夏季(52.5 mg/m3)相对较低。浮游动物群落物种多样性指数H′年平均值为2.50, 均匀性指数J′年平均值为0.65, 季节比较上, 夏季浮游动物多样性和均匀度均较高, 而春季多样性和均匀性平均值为低值, 且最大值和最小值之间波动范围较大。进一步分析显示, 湾内的筏架养殖对浮游动物群落的分布有显著影响。  相似文献   

低温冷害对南阳农业生产的影响与防御     

许孟会  冯晓  庞涛  祝晓红  胡恒瑞 《气象与环境科学》2010,33(Z1)

利用气象和相关农业资料,分析了2009年入冬以来南阳市低温冷害对小麦、油菜、蔬菜以及设施农业的影响,结果表明:此次低温冷害发生早、持续长、范围大,对农业影响有利也有弊,其中对小麦影响利大于弊,对油菜影响弊大于利,蔬菜则受灾严重.  相似文献   

Analysis of '2008. 02. 24'Heavy Snow Weather Process     

Pang Zhuantang  Wang Zhangwang 《山西气象》2008,(3)

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ECONOMIC EXCHANGES AND SECTORAL AND INTER—CITY COOPERATION IN NORTHEAST ASIA     

LIWen－yan PANGXiao－min 《中国地理科学(英文版)》2002,12(2):97-106

Northeast Asia with China ,Japan and South Korea as the main components has drawn more and more atten-tion worldwide.Many scholars have researchec on the prospect of some alternatives of regional economic integration in Northeast Asia/or Yellow Sea Rin as its core area.In this paper the authors start with an introduction of the major arguments embracing Yellow Sea Rim regionalism,and attemptto identify the dynamics challenging the proposed approach-es of sub-regionalism of Northeast Asia.The paper firstly gives a brief review on the undate development of bilateral econom-ic exchanges,mainly Sino-Japanese and Sino-South Korean trades and direct investments with related contemporary is-sues.When the changing pattern of economic interactions is analyzed,special concerns are given to the possibility to real-ize the supposed potential of regional economic cooperation mainly based on economic complementarity among the related regions of China ,North Korea,South Korea,and Japan.The authors then made their major efforts on putting forward possible approaches of multilateral cooperation of three countries in the near future,that is ,deepened cooperation in select-ed sectors of industry and transportation and coordinated development among major cities.The authors stress that the develop-ment of sub-regional sectoral cooperation and the formation of interactive network of city-regions via social and economic interactions at local level are significant to the future regional integrated development in Northeast Asia..  相似文献   

非稳定风场作用下太湖梅梁湾流场、散度场的研究          下载免费PDF全文

逄勇  濮培民 《大气科学学报》1996,19(2):186-190

利用太湖区域三维大气边界层数值模式和二维水动力学模式,研究了非均匀、非定常风场作用下的太湖梅梁湾流场和散度场的分布特征,得到了一些有意义的结论。  相似文献   

灰色关联度分析方法在电阻率测深曲线解释中的应用     

庞绪贵  鹿树武 《物探化探计算技术》1997,19(1):66-70

本文首先介绍了灰色系统理论中灰色关联度分析方法的基本原理，然后以实测电测深找水资料为基础，系统地阐述了在灰色系统理论中，灰色关联度分析方法在电测深找水资料数据处理中的应用  相似文献   

长江口区水中的汞   总被引：1，自引：0，他引：1  

张淑美  郑舜琴  庞学忠 《海洋科学》1989,13(5):40-43

本文报告了1985年8月和1986年3月长江口区表层水中溶解汞、颗粒汞和总汞的含量及分布。并讨论了长江水与海水混合过程中汞的行为。  相似文献