秦南地区天然气成因与油气勘探潜力分析     

庄新兵  邹华耀  李楠  魏刚  孙和风 《吉林大学学报(地球科学版)》2011,41(3):680-688

为了评价和认识秦南地区有重大勘探突破的陡坡带和该区的勘探潜力,利用该地区天然气组分和碳同位素等分析资料、伴生原油的油源对比以及油气运移模拟,定量刻画与定性评价相结合,对秦南地区天然气成因和油气勘探潜力进行了系统研究.研究表明:凸起带天然气为新近系溶解气且以干气为主,陡坡带天然气为古近系凝析气且为湿气;陡坡带天然气主要为...  相似文献   

Seasonal variation in functional phytoplankton groups in Xiangxi Bay, Three Gorges Reservoir     

杨敏  毕永红  胡建林  朱孔贤  周广杰  胡征宇 《中国海洋湖沼学报》2011,(5)

We describe the phytoplankton dynamics and structure in Xiangxi Bay, Three Gorges Reservoir. Samples were collected monthly in the surface waters between August 2007 and July 2008. We identified 10 principle functional groups. C-strategists and S/R-strategists with a wide range of tolerance dominated the phytoplankton assemblage. Seasonal variation was related to water column stability because of changes in hydraulic operation in October, January, and May. Functional group C (Asterionella formosa) and P (Au...  相似文献   

热带西太平洋海域上层海洋热含量的CSEOF分析   总被引：4，自引：0，他引：4  

吴晓芬  许建平  张启龙  刘增宏 《热带海洋学报》2011,(6)

基于月平均Argo温、盐度剖面、纬向风和Ni o3.4指数等资料,利用循环平稳经验正交函数(CSEOF)分解法、最大熵谱分析和相关分析等方法,研究了热带西太平洋海域上层(0—700m)海洋热含量的时空变化特征,并探讨了其年际变化的可能原因。结果表明,热带西太平洋海域上层海洋热含量距平场具有显著的东-西向反位相振荡,且这种振荡除了具有较明显的季节变化外,还存在着较强的准2a振荡。此外,热含量距平场还存在着负-正-负的三极式经向模态,该模态除了具有明显的季节变化外,还存在着显著的准4a振荡。进一步分析表明,热含量的准2a振荡与ENSO事件的发生有着非常密切的联系,并对赤道西太平洋纬向风异常有1—2月的滞后响应。  相似文献   

越南巴达棱湾沿岸海域周年风和浪的观测分析     

刘愉强  杨阳  廖世智  冯砚青  赖新云 《热带海洋学报》2011,(5)

基于国内首次在越南巴达棱湾2007年5月—2008年4月的风、浪现场实测资料,对该海区的风和浪的基本特征进行了初步统计分析,得出如下结论:1)海区季风现象明显,冬季(夏季)盛行东北(西南)季风,东北季风强度大于西南季风强度;2)海区波向与风向基本一致,即冬季(夏季)常浪向和强浪向均是E(SSW)向浪;3)海区以风浪为主,波谱表现为多峰结构,主峰多为单峰和双峰结构,东北季风(西南季风)期间,峰值周期对应的波向为E(SSW)向,台风对海域的波谱影响明显。文章结果对认识与我国同纬度的南沙群岛海域的风、浪特点具有一定参考价值。  相似文献   

交替蛙跳格式在POM的应用     

王强  周伟东  王东晓 《热带海洋学报》2011,(4)

讨论交替蛙跳格式在二维POM的运用。这个交替蛙跳格式是在z坐标下开发的针对线性浅水波方程的一种新的高效无耗散的格式。首先通过一维问题的试验,给出了σ坐标下非线性浅水波的演化特性及其交替蛙跳格式的数值特性,证实该格式的可行性以及优于传统格式的计算效率、守恒性及稳定性。其次,针对该格式二维问题运用讨论了科氏项相应的数值处理,给出了一套完整的数值计算方法,并应用于正压方程和POM外模的数值计算。研究表明,交替蛙跳格式具有两倍于传统蛙跳格式的计算效率,且不再需要Assenlin时间滤波,由此避开了时间滤波带来的数值衰减,具有良好的数值守恒性能。  相似文献   

Characteristics of climate change in the “significant impact zone” affected by aerosols over eastern China in warm seasons   总被引：1，自引：0，他引：1  

SHI XiaoHui  XU XiangDe  XIE LiAn State Key Laboratory of Severe Weather  Chinese Academy of Meteorological Sciences  Beijing  China 《中国科学D辑(英文版)》2008,(5)

Through analysis of the distribution pattern and changing characteristics of atmospheric aerosols over the East Asia region during warm seasons in recent 20 a and beyond as well as their possible interac- tive relationship with a variety of meteorological elements, it is found that the high-value zone of aerosol optical depth derived from the Total Ozone Mapping Spectrometer (TOMS), its significant negative correlation zones in terms of sunshine duration (SD) and surface air temperature (SAT) and its significant positive correlation zones with low-level cloud amount (LCC) are co-located in the South China region during warm periods. Based on this finding, the region is referred to as a "significant impact zone" (SI zone) affected by aerosols. Then, a comparative analysis is made on variation differ- ences of observed SAT, SD and LCC, etc. in different regions. It is also found that the LCC is increased and the SD is decreased within the "SI zone" over eastern China during the warm season. These characteristics are more evident than those beyond the zone, while the warming trend within the zone is evidently weaker than that outside it. Studies show that since recent 20 a, under the influence of aerosols, the LCC tend to increase substantially with a clear decrease of SD and an unnoticeable warming trend within the "SI zone". Comparing with the climate change beyond the zone, the difference is significant. Therefore, the effects of atmospheric aerosols on climate is possibly one of the contri- butions to the difference of climate change existed between the southern and northern parts of the Eastern China during a warm season.  相似文献   

地震波传播的褶积微分算子法数值模拟   总被引：2，自引：0，他引：2  

李信富  李小凡 《地球科学》2008,33(6):861-866

为了解决地震波场数值模拟中的速度与精度的匹配及局部信息与全局信息的耦合等问题, 该文借助新推出的基于Forsyte广义正交多项式的褶积微分算子, 将计算数学中的Forsyte多项式褶积微分算子应用到地震波传播的数值模拟中.复杂非均匀介质模型数值模拟结果说明了该方法的可行性和优越性.该方法同时具有广义正交多项式褶积微分算子的高精度和有限差分短算子算法的高速度.通过对算子长度的调节及算子系数的优化, 可同时兼顾波场解的全局信息与局部信息.   相似文献   

Protection of bridge piers against scouring with tetrahedral frames     

Yee-Meng CHIEW 《国际泥沙研究》2009,24(4):385-399

Armoring countermeasures, such as riprap stones, are the primary method used to protect bridge piers against scouring; however, these methods have not had definitive success. Recently, flow-altering countermeasures, such as sacrificial piles, have been tested as an alternative to armoring countermeasures. This study investigated the mechanics of an innovative flow-altering countermeasure device, frames in the shape of tetrahedrons that act as a pier-scour countermeasure. Results of measured characteristics for turbulence flow showed that the flow around the tetrahedral frames can be divided into three regions： （1） a deceleration region near the sediment bed; （2） an acceleration region in the middle of water depth region; and （3） a restoration region near the water surface. The velocity magnitudes, turbulent intensities and vorticities decreased in the deceleration region, increased in the acceleration region and reverted to that of the unprotected condition in the restoration region. This pier-scour countermeasure is innovative because of its ability to dissipate energy associated with the downflow and the horseshoes vortex generated around the bridge pier. The scour tests revealed that the frames protected the foundation of bridge piers against scour. The experimental results showed that the percentage reduction of scour depth decreased as the velocity ratio, U/U c , decreased, reaching a value of 50% for the range of parameters tested in this study. Moreover, its efficiency was dependent on the placement density of the frames. The data showed that the frames were more effective when η was larger. However, their influence becomes less significant when η≥ 0.16.  相似文献   

钻孔灌注桩的超声波检测     

殷建武  李清林 《CT理论与应用研究》2009,18(3)

结合焦郑高速公路钻孔灌注桩的超声波检测,对超声波检测的原理、方法以及桩身缺陷的判定进行了介绍和分析,通过实例证明超声波检测法能准确判断出桩身缺陷的位置和范围,并能对缺陷严重程度做出评价,是检测灌注桩桩身质量的一种较好方法.  相似文献   

Two new species of Vestrogothia (Phosphatocopina, Crustacea) of Orsten-type preservation from the Upper Cambrian in western Hunan, South China     

ZHANG HuaQiao  & DONG XiPing  School of Earth  Space Sciences  Peking University  Beijing  China  State Key Laboratory of Palaeobiology  Stratigraphy  Nanjing Institute of Geology  Palaeontology  Chinese Academy of Sciences  Nanjing 《中国科学D辑(英文版)》2009,(6)

Although fossils of Orsten-type preservation represented by Skaracarida and Phosphatocopina were first reported from the Middle and Upper Cambrian in western Hunan, South China in 2005, diversified phosphatocopine species have never been appropriately described and elucidated in terms of their evolutionary relationships. Here, we described two new species of Phosphatocopina, Vestrogothia anterispinata sp. nov. and V. bispinata sp. nov. The evolutionary relationship among all the valid species of Phosphatoco...  相似文献