两种再分析资料平流层温度场的对比分析   总被引：4，自引：0，他引：4  

徐菊艳  王盘兴  吴洪宝 《南京气象学院学报》2008,31(3):429-435

在Lorenz环流分解基础上,比较了全球平流层低层ECMWF和NCEP/NCAR两种再分析资料月平均温度场的差异。结果表明：（1）纬向的平均温度无论DJF季度还是JJA季度100 hPa,30°S～30°N纬带都是冷中心;在该冷纬带ECMWF资料温度均值显著低于NCEP资料,ECWMF资料的年际方差显著小于NCEP资料。（2）30 hPa以上NCEP资料的定常波比较杂乱,在中纬大陆上出现与事实不符的高低中心,而ECMWF资料反映的气温定常波则比较合理。（3）ECMWF资料在100 hPa和10 hPa上气温异常未能充分地反映近50 a来3次强的火山喷发引起的平流层增温。  相似文献   

Effect of modified Chaplygin gas in anisotropic universe     

Shuvendu Chakraborty  Ujjal Debnath 《Astrophysics and Space Science》2009,321(1):53-56

In this work, we have studied the model of modified Chaplygin gas and its role in accelerating phase of the universe for anisotropic model. We have assumed that the equation of state of this modified model is valid from the radiation era to ΛCDM model. We have obtained the possible relation between the hessence and the modified Chaplygin gas. We have also use the statefinder parameters for characterize different phase of the universe diagrammatically.  相似文献   

青海祁连山冻土区发现天然气水合物   总被引：64，自引：1，他引：63  

祝有海  张永勤  文怀军  卢振权  贾志耀  李永红  李清海  刘昌岭  王平康  郭星旺 《地质学报》2009,83(11):1762-1771

祁连山冻土区位于青藏高原北缘,多年冻土面积约10×10~4km~2,具有良好的天然气水合物形成条件和找矿前景.2008～2009年间中国地质调查局在青海省天峻县木里煤田聚乎更矿区施工"祁连山冻土区天然气水合物科学钻探工程",迄今共完成钻探试验井4口,总进尺2059.13m,分别在DK-1、DK-2和DK-3钻井中钻获天然气水合物实物样品,取得了找矿工作的重大突破.天然气水合物产于冻土层之下,埋深133～396m.水合物呈白色、乳白色晶体,点火能燃烧,红外热像仪测温后呈明显的低温异常,放进水里强烈冒泡,水合物分解后能不断冒出气泡和水滴,并残留下特征的蜂窝状构造.激光拉曼光谱仪检测呈现特征的水合物光谱曲线,测井曲线也具有较明显的高电阻率和高波速标志.祁连山天然气水合物具有冻土层薄、埋深浅、气体组分复杂、以煤层气成因为主等明显特征,是一种新类型水合物.这是我国冻土区首次钻获的天然气水合物实物样品,也是全球首次在中低纬度高山冻土区发现天然气水合物实物样品,具有重要的科学意义和经济意义.  相似文献   

Light hydrocarbons geochemistry of surface sediment from petroliferous region of the Mehsana block,North Cambay Basin     

T. Madhavi  T. Satish Kumar  M. A. Rasheed  G. Kalpana  D. J. Patil  A. M. Dayal 《Journal of the Geological Society of India》2009,74(1):7-15

A study was carried out to test the usefulness of surface geochemical methods as regional evaluation tools in petroliferous region of the Mehsana block, North Cambay Basin. A suite of 135 soil samples collected from the depth of 2.5 m, were analyzed for adsorbed light gaseous hydrocarbons and carbon isotopes (δ¹³C_methane and δ¹³C_ethane). The light gaseous hydrocarbon analysis show that the concentration ranges 402 ppb, 135 ppb, 70 ppb, 9 ppb and 18 ppb of C₁, C₂, C₃, iC₄ and nC₄, respectively. The value of carbon isotopic ranges of methane −29.5 to −43.0‰ (PDB) and ethane −19.1 to −20.9‰ (PDB). This data, when mapped, indicates patterns coinciding with major known oil and/or gas field of Sobhasan/Linch in this study area. The existence of un-altered petroliferous microseeps of catagenetic origin is observed in the study area. A regional study, such as the one described here, can provide important exploration facts concerning the regional hydrocarbon potential in a block. This method has been confirmed and can be applied successfully in frontier basins.  相似文献   

Thermal maturity and organic composition of Pennsylvanian coals and carbonaceous shales, north-central Texas: Implications for coalbed gas potential     

Paul C. Hackley  Edgar H. Guevara  Tucker F. Hentz  Robert W. Hook 《International Journal of Coal Geology》2009,77(3-4):294-309

Thermal maturity was determined for about 120 core, cuttings, and outcrop samples to investigate the potential for coalbed gas resources in Pennsylvanian strata of north-central Texas. Shallow (< 600 m; 2000 ft) coal and carbonaceous shale cuttings samples from the Middle-Upper Pennsylvanian Strawn, Canyon, and Cisco Groups in Archer and Young Counties on the Eastern Shelf of the Midland basin (northwest and downdip from the outcrop) yielded mean random vitrinite reflectance (R_o) values between about 0.4 and 0.8%. This range of R_o values indicates rank from subbituminous C to high volatile A bituminous in the shallow subsurface, which may be sufficient for early thermogenic gas generation. Near-surface (< 100 m; 300 ft) core and outcrop samples of coal from areas of historical underground coal mining in the region yielded similar R_o values of 0.5 to 0.8%. Carbonaceous shale core samples of Lower Pennsylvanian strata (lower Atoka Group) from two deeper wells (samples from ~ 1650 m; 5400 ft) in Jack and western Wise Counties in the western part of the Fort Worth basin yielded higher R_o values of about 1.0%. Pyrolysis and petrographic data for the lower Atoka samples indicate mixed Type II/Type III organic matter, suggesting generated hydrocarbons may be both gas- and oil-prone. In all other samples, organic material is dominated by Type III organic matter (vitrinite), indicating that generated hydrocarbons should be gas-prone. Individual coal beds are thin at outcrop (< 1 m; 3.3 ft), laterally discontinuous, and moderately high in ash yield and sulfur content. A possible analog for coalbed gas potential in the Pennsylvanian section of north-central Texas occurs on the northeast Oklahoma shelf and in the Cherokee basin of southeastern Kansas, where contemporaneous gas-producing coal beds are similar in thickness, quality, and rank.  相似文献   

四川后高坪地区晚泥盆世植物和遗迹化石的新发现   总被引：2，自引：0，他引：2  

张立军  龚一鸣 《地层学杂志》2009,33(2)

在扬子板块西缘后高坪地区新发现植物化石Cyclostigma kiltorkense(平圆印木)和Lepidodendropsis hirmeri(希氏拟鳞木),以及遗迹化石Zoophycos(动藻迹)和Chondrties(丛藻迹),据此及相关地层和沉积相标志,确定该地层时代为晚泥盆世,沉积环境为由早期为滨岸较粗碎屑岩和浅海中上部细碎屑岩沉积,晚期为碳酸盐台地相。  相似文献   

电感耦合等离子体质谱法测定井间示踪剂中稀土元素   总被引：5，自引：3，他引：2  

曹煊  李景喜  俞晶晶  于振花  陈维余  杨黄浩  王小如 《岩矿测试》2009,28(2):91-96

以甲醇为稀释剂,用电感耦合等离子体质谱法快速测定稀土示踪剂中17个稀土元素。研究表明,在优化的稀释剂甲醇浓度为2%(体积分数)、pH<2.47的条件下测定稀土元素,方法精密度(RSD)为1.23%~2.83%,日间6次测定的精密度为2.25%~4.76%,各稀土元素线性关系良好,检出限为2.0~9.0 ng/L;17个稀土元素的加标回收率为85%~108%,满足痕量元素分析要求。  相似文献   

超声提取-固相萃取小柱净化-气相色谱法测定土壤中14种有机氯农药   总被引：7，自引：7，他引：0  

刘文长  陶文靖  程丽娅  余兴  田旻  黄勤  李胜生 《岩矿测试》2009,28(6):541-544

对土壤中14种有机氯农药的超声提取技术和磺化、固相萃取小柱两种净化方法进行系统研究。结果表明,超声提取节省提取时间,提高分析效率;磺化法和固相萃取小柱法都有净化作用,但磺化法使样品中的艾氏剂、狄氏剂和异狄氏剂全部损失;固相萃取小柱净化当丙酮-正己烷淋洗液体积比为1∶9、淋洗液收集8 mL时回收率>90%,干扰最小。方法检出限为0.63~2.59μg/kg,精密度(RSD,n=7)为1.17%~14.66%,基体加标平均回收率为82.78%~106.94%。方法用于生态地球化学调查评价批量土壤样品的实际分析,检测结果满足评价工作需要。  相似文献   

空气滤膜采集大气浮尘样品中多元素的测定   总被引：3，自引：1，他引：2  

陈波  冯永明  刘洪青 《岩矿测试》2009,28(5):435-438

用氢氟酸-盐酸-硝酸-高氯酸体系对空气滤膜上附着的浮尘样品进行分解,电感耦合等离子体发射光谱法、电感耦合等离子体质谱法同时测定溶液中15个主量和微量元素铁、铜、锌、镍、镧、铈、锂、锰、铬、镉、钴、铅、钍、铊、铀。将国家一级标准物质模拟浮尘样品加入空白滤膜进行测定,结果与标准值相符。各元素4次测定结果的相对标准偏差(RSD)小于5%。  相似文献   

陕西几类重要铅锌矿床的矿物微量元素和稀土元素特征   总被引：13，自引：6，他引：7  

李厚民  王登红  张长青  陈毓川  李立兴 《矿床地质》2009,28(4):434-448

文章将陕西铅锌矿分为海底喷气沉积型(即SEDEX型)、与海底喷气沉积-改造作用有关的类SEDEX型和MVT型3类.对马元(MVT型)、南沙沟和江坡(类SEDEX型)、铅硐山和二里河(SEDEX型)铅锌矿床中的闪锌矿等矿物进行的微量元素和稀土元素测定结果表明,3类矿床各具特点:马元铅锌矿床闪锌矿的Co、Ni、Th、Y含量较低,而Mo、Cs、Sr、Ba、T1含量较高;南沙沟和江坡铅锌矿床闪锌矿的Sn、Sb、W含量较低,而Mn、Y、Zr、In含量较高;铅硐山和二里河铅锌矿床闪锌矿的Li、Zr、CB、Ba含量较低,而W含量较高;在闪锌矿Li-Cs、Zr-In、W-Sn、∑REE-δEu、δEu-δCe散点图上,5个矿床的投点按上述3类分别集中.但铅硐山和二里河铅锌矿床与南沙沟和江坡铅锌矿床具有更多的相似性,而与马元铅锌矿床差异较大:在闪锌矿Sr-Ba、Co-Ni、Th-Y、Mo-T1散点图上,马元的投点集中于一处,而其他4个矿床的投点集中于另一处;马元闪锌矿具有十分明显的铕正异常,而南沙沟、江坡、铅硐山和二里河闪锌矿铕异常不明显,或具有负铕异常;5元素矿床闪锌矿稀土元素配分曲线均为轻稀土元素稍富集的右倾型,但马元的稀土元素总量明显低于其他4个矿床.  相似文献