滇黔北下古生界海相页岩气藏赋存条件评价   总被引：11，自引：3，他引：8  

梁兴  叶熙  张介辉  舒红林  楼基胜  姚秋昌  王高成 《海相油气地质》2011,16(4):11-21

页岩气区域地质调查和钻探成果表明,滇黔北坳陷属于改造残留型构造坳陷,海相下志留统龙马溪组和下寒武统牛蹄塘组黑色页岩发育,单层厚度达50m以上.评价区页岩的厚度、埋深、TOC、含气性、力学性质、物性和矿物成分等评价参数与北美已商业开发页岩气田的具有一定相似性,具备形成页岩气藏的有利地质条件,是现实的页岩气勘探开发重要目的...  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987110000344     

Jinfu Shu  Xiaojia Chen  I.-Ming Chou  Wenge Yang  Jingzhu Hu  Russell J. Hemley  Ho-kwang Mao 《地学前缘(英文版)》2011,2(1):93-100

The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure typesⅠ,Ⅱ,and H in diamond-anvil cells.The diffraction data for typesⅡ(sⅡ) and H(sH) were refined to the known structures with space groups Fd3m and P6_3/mmc,respectively.Upon compression,sⅠmethane hydrate transforms to the sⅡphase at 120 MPa,and then to the sH phase at 600 MPa.The sⅡmethane hydrate was found to coexist...  相似文献   

大西洋热盐环流年代际变化机制研究Ⅲ.北大西洋海气要素对热盐环流年代际振荡的影响     

牟林  陈学恩  宋军  李欢  李琰  姜晓轶  李海  陈幸荣 《海洋学报(英文版)》2011,30(4):19-28

基于该系列文章前文研究中构建的海气耦合气候模式和所揭示的北大西洋热盐环流年代际振荡机制,针对海气要素对该振荡机制的影响问题进行了重点的探讨。为细致准确的研究北大西洋海洋要素同北大西洋热盐环流年代际振荡的关系,有针对性的定义了副极地海区表层密度指数和北大西洋暖流强度指数并对模式结果进行了全面分析。分析结果表明副极地海区表层密度变化领先大西洋径向翻转环流(MOC)变化7 a,北大西洋暖流的变化领先 MOC变化4 a,格陵兰－苏格兰海脊溢流水强度(包括丹麦海峡溢流水和法鲁海峡溢流水,是北大西洋深层水的重要来源)的变化领先 MOC的变化3 a;北大西洋大气要素变化对北大西洋热盐环流年代际振荡有非常重要的调制作用,当副极地流环和北大西洋暖流(NAC)达到最强的2 a之前,高纬度地区大气为气旋式环流异常,中纬度地区大气为反气旋式环流异常,海表热通量在大西洋副极地海区是负异常,这都有利于副极地流环和NAC的加强,更多高盐度的北大西洋水进入格陵兰-冰岛-挪威海(GIN)海域,由此可以导致GIN海域表层密度上升,使水体的层结稳定性减弱,有利于深层对流的发生,同时大气变化通过风应力旋度和海表热通量也直接影响GIN海域深层水的生成,进而导致格陵兰－苏格兰海脊溢流水的强度增加。  相似文献   

青岛文昌鱼（Branchiostomabelcheri tsingtauense）染色体G类带型研究   总被引：1，自引：0，他引：1  

牟洪善  王昌留  李金萍 《海洋与湖沼》2011,42(4):597-602

以青岛文昌鱼的晚期囊胚和早期原肠胚的胚胎细胞为实验材料,利用低渗处理、空气干燥法制备染色体玻片标本。在此基础上,为进一步探索显示青岛文昌鱼染色体G带的新方法,采用片龄、蛋白酶K和胰蛋白酶显带技术对青岛文昌鱼的染色体进行了初步研究,显示了青岛文昌鱼染色体的G类带型,绘制了青岛文昌鱼染色体的G类带型模式图,并对三种G类带型...  相似文献   

同源和异源精子诱导大黄鱼(Pseudosciaena crocea)雌核发育的胚胎发育比较及子代 SSR 遗传标记分析          下载免费PDF全文

苗亮  王天柱  李明云  汤先念  王曙  安钦  徐万土 《海洋与湖沼》2011,42(3):419-424

以紫外灭活的同源(大黄鱼)精子和未灭活的异源(鮸鱼)精子为激活源, 采用冷休克处理的方法诱导了大黄鱼雌核发育二倍体, 进行胚胎发育和 SSR 标记分析的比较研究。结果表明, 异源组的受精率和孵化率高于同源组, 但存活率低于同源组; 两组中经冷休克处理未能恢复倍性的胚胎发育畸形而陆续死亡, 恢复倍性的胚胎在发育程序上均与普通大黄鱼相同, 但各阶段出现时间较对照组滞后; SSR 分析显示同源组子代中有 16.7%出现父本条带, 异源组子代均未出现父本条带。以灭活的同源(大黄鱼)精子和未经灭活的  相似文献   

Study on roughness coefficient for unsubmerged reed in the Changjiang Estuary   总被引：2，自引：0，他引：2  

GU Fengfeng  MU Lin  QI Dingman  LI Junhu  KONG Lingshuang  WAN Yuanyang 《海洋学报(英文版)》2011,30(5):108-113

The influence of density,foliage and stem flexibility on the roughness coefficients under unsubmerged conditions,such as Manning’s n,is investigated experimentally.An instrumentation system has been developed for measuring the flow rate ranging from 0.1 to 0.3 L/s under the condition of different artificial foliated reeds.Based on the experimental results,the influence on the relationship between n with different density,foliage,flexibility and flow depth is discussed.It is found that the foliage and the density are the important factors affecting Manning’s n.At a range of relatively low velocity and relatively large bending stiffness of stem,Manning’s n is not influenced significanthy by the flexibility of stem.  相似文献   

Sediment retention at the Changjiang sub-aqueous delta over a 57 year period,in response to catchment changes   总被引：1，自引：0，他引：1  

Shu Gao  Ya Ping WangJian-hua Gao 《Estuarine, Coastal and Shelf Science》2011

The growth of a river delta system is controlled mainly by fluvial sediment discharge and sediment retention in the deltaic areas. In the present study, we attempt to define a sediment retention index, R, and its relation to the deposition rate of the delta. Based upon two assumptions that the amount of the sediment that escapes from the deltaic areas, Q_E, is stationary with minor fluctuations, and that there is a linear relationship between the deposition rate averaged over the sub-aqueous delta (D_av) and the deposition rate at accretion sites within the delta (D_R), the changes in the accretion/erosion patterns of the Changjiang sub-aqueous delta during the period of 1951–2007, in response to river sediment discharge changes, are analyzed. The results show that the sediment retention index can be related to the deposition rate of the sub-aqueous delta; the spatial-temporal distribution pattern of the deposition rate reveals the behaviour of sediment retention of a delta system. For the Changjiang sub-aqueous delta, fluvial sediment discharge data, together with Pb-210 based deposition rates, provide useful information on sediment retention. Changes in the sediment retention index and the accretion/erosion patterns of the sub-aqueous delta have taken place in response to river input changes. In order to improve our understanding of the processes associated with estuarine sediment retention, sediment cores with sufficient spatial coverage may be collected and analyzed to establish accurate Q_E–R and D_av–D_R relationships. In combination with numerical modeling of sediment transport, these relationships form a basis for the analysis of sediment retention mechanisms.  相似文献   

Undrained bearing capacity of spudcan under combined loading   总被引：1，自引：0，他引：1  

王立忠  舒恒  李玲玲  国振 《中国海洋工程》2011,25(1):15-30

The bearing capacities of spudcan foundation under pure vertical (V),horizontal (H),moment (M) loading and the combined loading are studied based on a series of three-dimensional finite element analysis.The effects of embedment ratio and soil non-homogeneity on the bearing capacity are investigated in detail.The capacities of spudcan under different pure loading are expressed in non-dimensional bearing capacity factors,which are compared with published results.Ultimate limit states under combined loading are presented by failure envelopes,which are expressed in terms of dimensionless and normalized form in three-dimensional load space.The comparison between the presented failure envelopes and available published numerical results reveals that the size and shape of failure envelopes are dependent on the embedment ratio and the non-homogeneity of the soil.  相似文献   

TRMM和CMORPH卫星资料对三峡库区降水的评估分析     

张天宇  桂术  杨若文  王勇  李永华 《气象》2020,46(8):1098-1112

利用1998—2016年TRMM和CMORPH两种遥感卫星资料降水和同期三峡库区气象观测站数据,通过比较干、支流和远、近库区气象站点的降水变化和蓄水前后降水量、雨日、降水强度和频率等变化特征,分析评估了基于两种卫星遥感降水和测站降水的三峡库区局地降水变化。结果表明:库区TRMM和CMORPH卫星降水年际变化特征总体上与气象观测站相符,反演效果在日尺度TRMM略逊于CMORPH,在季尺度CMORPH略逊于TRMM;两种卫星资料对冬季降水反演效果都偏弱。三峡库区干流和支流站点的降水变化总体一致,干、支流各站点降水量均具有较强的年际变化特征。TRMM相比CMORPH更能重现干、支流测站降水的年际变化特征,CMORPH降水年际波动振幅总体上比测站偏大。蓄水前后时段(1998—2003年与2004—2016年)对比,从不同等级降水的强度和雨日、季节降水频率和总量等变化反演效果来看,CMORPH资料分布相比TRMM更接近测站的变化趋势,反演效果略优于TRMM;但两种卫星资料的降水频率和降水量分布与测站的误差在蓄水前后变化都不明显。此外,气象测站、TRMM、CMORPH资料都表现出蓄水后三峡远、近库区年降水量的比值呈平稳波动状态,表明三峡水库蓄水后附近地区降水没有明显变化。  相似文献   

Using the Lund-Potsdam-Jena Model to Understand the Different Responses of Three Woody Plants to Land Use in China     

SUN Guodong  MU Mu 《大气科学进展》2013,30(2):515-524

In this study, the approach of conditional nonlinear optimal perturbation related to initial perturbation (CNOP-I) was employed to investigate the maximum variations in plant amount for three main woody plants (a temperate broadleaved evergreen, a temperate broadleaved summergreen, and a boreal needleleaved evergreen) in China. The investigation was conducted within a certain range of land use intensity using a state-of-the-art Lund-Potsdam-Jena dynamic global vegetation model (LPJ DGVM). CNOP-I represents a class of deforestation and can be considered a type of land use with respect to the initial perturbation. When deforestation denoted by the CNOP-I has the same intensity for all three plants, the variation in plant amount of the boreal needleleaved evergreen in northern China is greater than the variation in plant amount of both the temperate broadleaved evergreen and temperate broadleaved summergreen in southern China. As deforestation intensity increases, the plant amount variation in the three woody plant functional types carbon changes, in a nonlinear fashion. The impact of land use on plant functional types is minor because the interaction between climate condition and land use is not considered in the LPJ model. Finally, the different impacts of deforestation on net primary production of the three plant functional types were analyzed by modeling gross primary production and autotrophic respiration. Our results suggest that the CNOP-I approach is a useful tool for exploring the nonlinear and different responses of terrestrial ecosystems to land use.  相似文献