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Characteristics and distribution patterns of reef complexes on the carbonate platform margin in deep water areas: the western South China Sea

As a potential oil and gas reservoir, reef complexes have been a research focus from petroleum geologists for a long time. There are favorable conditions for the development of reef complexes in the South China Sea; however, their internal structures, evolution and distribution are still poorly understood. Based on 2D and 3D seismic data, the internal structures and evolution patterns of the reef complexes on the carbonate platform margin in the deep water areas over the western South China Sea were studied in detail. The result shows that two types of reef complexes, i.e., fault controlling platform margin reef complexes and ramp reef complexes have been developed in the study area. The reef complexes have independent or continuous mound or lenticular seismic reflections, with three internal structures (i.e., aggrading, prograding and retrograding structures). There are different growth rates during the evolution of the reef complexes, resulting in the formation of catch-up reefs, keep-up reefs and quick step reefs. The study also reveals that different platform margin reef complexes have different internal structures and distributions, because of the different platform types. These results may be applied to the exploration and prediction of carbonate platform margin reef complexes in other areas that are similar to the study area.     

Carbon Emission of Regional Land Use and Its Decomposition Analysis: Case Study of Nanjing City,China

Through the matching relationship between land use types and carbon emission items, this paper estimated carbon emissions of different land use types in Nanjing City, China and analyzed the influencing factors of carbon emissions by Logarithmic Mean Divisia Index(LMDI) model. The main conclusions are as follows: 1) Total anthropogenic carbon emission of Nanjing increased from 1.22928 x 107 t in 2000 to 3.06939 x 107 t in 2009, in which the carbon emission of Inhabitation, mining & manufacturing land accounted for 93% of the total. 2) The average land use carbon emission intensity of Nanjing in 2009 was 46.63 t/ha, in which carbon emission intensity of Inhabitation, mining & manufacturing land was the highest(200.52 t/ha), which was much higher than that of other land use types. 3) The average carbon source intensity in Nanjing was 16 times of the average carbon sink intensity(2.83 t/ha) in 2009, indicating that Nanjing was confronted with serious carbon deficit and huge carbon cycle pressure. 4) Land use area per unit GDP was an inhibitory factor for the increase of carbon emissions, while the other factors were all contributing factors. 5) Carbon emission effect evaluation should be introduced into land use activities to formulate low-carbon land use strategies in regional development.     

基于PMC方法分析北京及邻区地震监测能力

1 研究背景 北京及邻区(39 °—41.5 °N,115 °—118 °E)地震活动背景活跃,政治、经济、文化高度集中,是我国经济社会发展以及减轻地震灾害的重点监视区之一(徐锡伟等,2002;陈颙等,2006).随着北京及邻区地震台网组成的不断完善和台站变更频度的加快,亟待及时动态评估地震监测能力变化,为北京及邻区日常监测预报业务提供数据支撑.国内外应用广泛的"基于概率的完整性震级"(probability-based magnitude of completeness,简称PMC)方法(Schorlemmer and Woessner,2008;Schorlemmer et al,2010),基于地震台阵/地震台网实际产出的观测资料,可实时、客观、准确地评估地震台网监测能力.采用PMC方法,对北京及邻区地震监测能力进行动态评估,以便摸清该区监测能力,进而为防震减灾部署、监测预报相关业务开展等提供重要的参考资料.     

秋季东海内陆架悬浮体分布特征

秋季是处于夏、冬季之交的过渡季节,夏季风减弱、冬季风增强的背景下海洋水文泥沙环境有独特特征,关于该时期悬浮体分布特征的研究较少.本文基于东海内陆架2016、2017与2018年秋季悬浮体及温盐数据,分析该海域秋季悬浮体浓度的水平和垂向分布特征.结果表明:悬浮体浓度近岸高于远岸,浓度等值线大致平行于等深线,近底层悬浮体浓...     

基于埋深变化的川南龙马溪组页岩孔隙特征及控制因素分析

[研究目的]中国浅层-中深层页岩气勘探开发技术已经趋于成熟,深层页岩成为下一步勘探开发的重点,探明不同埋深条件下页岩的孔隙特征及其控制因素利于推动深层页岩的评优选区工作.[研究方法]本文基于核磁共振、场发射扫描电镜和X-射线衍射等实验分析手段,对比性评价了川南地区不同深度的龙马溪组页岩孔隙度、孔隙结构参数特征并进行影响...     

一种八叉树和三维R树集成的激光点云数据管理方法

车载激光扫描点云数据已经成为数字城市和危机管理等领域越来越重要的三维空间信息源,针对大规模点云数据高效管理的技术瓶颈,提出一种八叉树和三维R树集成的空间索引方法——3DOR树,充分利用八叉树的良好收敛性创建R树叶节点,避免逐点插入费时过程,同时R树平衡结构保证良好的数据检索效率。并还扩展R树结构生成多细节层次(LOD)点云模型,提出一种支持缓存的多细节层次点云数据组织方法。试验证明,该方法具有良好的空间利用率和空间查询效率,支持多细节层次描述能力和数据缓存机制,可应用于大规模点云数据的后处理与综合应用。     

月球重力场模型研究进展和我国将来月球卫星重力梯度计划实施

本文介绍了基于国际探月观测数据建立的月球重力场模型:8×4、15×8、13×13、5×5、7×7、16×16-1/2/3、Lun60d、GLGM-1/2、LP75D/G、LP100K/J、LP165P、LP150Q和SGM90d;通过对比SST-HL/LL-Doppler-VLBI和SST-HL/SGG-Doppler-VLBI跟踪观测模式的优缺点,建议我国将来首期月球卫星重力测量计划采用SST-HL/SGG-Doppler-VLBI较优;其次,通过对比静电悬浮、超导和量子卫星重力梯度仪的优缺点,建议我国将来首期月球卫星重力梯度计划采用静电悬浮重力梯度仪;并建议我国将来首颗月球重力梯度卫星的轨道高度(50～100 km)选择在已有月球探测卫星的测量盲区,轨道倾角(90°±3°)设计为有利于月球卫星观测数据全球覆盖的近极轨模式。     

“萤火一号”火星探测计划进展和Mars-SST火星卫星重力测量计划研究

本文回顾了国际火星探测计划的历史进程和科学意义,介绍了中国"萤火一号"火星探测计划的基本参数、发射过程、科学目标、核心载荷和关键技术,并且提出了中国将来Mars-SST火星卫星重力测量计划的实施建议:①基于探测精度较高、技术需求较少、测定速度较快、定轨要求较低、可借鉴GRACE的成功经验等优点,采用SST-LL-Doppler-VLBI系统观测模式;②先期开展高精度激光干涉星间测距仪、非保守力补偿系统等关键载荷和地面Doppler-VLBI系统的研制;③卫星轨道高度和星间距离分别设计为50～100 km和100±50 km;④先期开展仿真模拟研究。     

基于ArcGIS Flex API的WebGIS设计

本文根据Flex技术体系与特点,分析了基于Flex的WebGIS的系统结构,阐述了Flex在WebGIS设计中的优势所在;并结合ESEI公司的ArcGIS Flex API,设计了某地的"三防"决策管理WebGIS系统,论文从数据链接、地图显示、统计图表等功能实现说明了基于Flex的WebGIS设计过程;实践证明,使用Flex能够有效地提高WebGIS客户端的交互能力。