Source and commingling features of light oils from the Chepaizi uplift in the Junggar Basin,Northwest China     

Zhihuan Zhang  Liming Qin  Wei Li  Chunjiang Wang  Nansheng Qiu  Xianlong Meng  Zhenying Zhang  Dongshan Yuan 《中国地球化学学报》2010,29(2):121-129

Geochemical composition characteristics of light oils from the Tertiary in the west of the Chepaizi uplift in the Junggar basin, northwest China, are distinct from those of biodegraded oils derived from the Permian in the study area and crude oils from some adjacent oil fields such as the Chepaizi and Xiaoguai oilfields. Oil source correlation shows that light oils in the study area have similar n-alkane and isoprenoid distribution patterns and carbon isotope compositions with the coal-derived oils from the Jurassic, and display obvious discrepancy on biomarker composition characteristics with the Cretaceous source rock extracts, inferring that they are probably the mixed oils from the Jurassic coal measures and Cretaceous source rocks. In this study, combined with the geochemical data of coal-derived oils from the Jurassic and Cretaceous source rocks or crude oils from the Cretaceous, the source and commingling features of the Tertiary crude oils of Well Pai 2 and Well Pai 8 were investigated. The proportion of the two sources in the mixed crude oils was estimated, and the hydrocarbon accumulation pattern of reservoirs in the study area was established.  相似文献   

福建顺昌特大地质灾害气象条件分析     

邱泉成  郑清明  张能胜 《福建地质》2010,29(Z1)

利用测站雨量、加密区域自动站雨量、高空探测、卫星云图等资料,分析诱发顺昌"6.18"特大滑坡、崩塌、泥石流、地面塌陷等地质灾害的气象成因。结果表明,除地质地貌自然原因和人为因素外,与罕见连续特强降水天气过程的前期气候背景有关的是高空槽区稳定、中低层切变维持、高低空急流存在、中尺度系统强烈发展、充沛水汽输送辐合等气象条件导致特大暴雨引发地质灾害。  相似文献   

长江中下游江湖水沙调控数值模拟   总被引：1，自引：0，他引：1       下载免费PDF全文

施勇  栾震宇  陈炼钢  金秋 《水科学进展》2010,21(6):823-831

以长江中下游防洪系统为对象,在大型复杂防洪系统洪水运动数值模拟基础上,成功地将面向长江中下游防洪规划论证需求的洪水演进数学模型转化为面向长江防洪系统江湖水沙调控需求的长江中下游江湖水沙调控数学模型.为适应江湖水沙调控和评估的要求,提出了基于水动力学的闸坝调度计算模式.此外,还对河网分汊泥沙分配模式进行了深入研究.通过长江中下游防洪规划及其洞庭湖区"控支强干"方案论证模拟计算,较好地解决了防洪措施蓄泄后效评估和工程优化调控模式等关键难题,为防洪规划方案的制定提供了定量依据,主要成果已应用于长江中下游防洪规划方案.  相似文献   

长江中下游江湖蓄泄关系实时评估数值模拟   总被引：1，自引：0，他引：1       下载免费PDF全文

施勇  栾震宇  陈炼钢  金秋 《水科学进展》2010,21(6):840-846

以长江中下游防洪系统为对象,将面向长江中下游防洪规划论证需求的水沙数学模型转化为面向长江防洪系统防汛方案评估需求的长江中下游蓄泄关系实时评估数学模型.为适应实时蓄泄评估快速、准确的要求,提出了基于水动力学的循环滚动计算模式、实时校正模式和实时防洪调度的试验机制.实现了水文学实时校正方法与水动力学数学模型的耦合,建立了基于水动力学的实时校正模式.为了满足长江中下游江湖蓄泄关系实时评价的需求,探讨了洪水模拟与分蓄洪调度模式的耦合.通过长江中下游防汛期间的试运行,较好地解决了防洪措施蓄泄关系评估和工程优化调控模式等关键难题,为防洪规划方案的制定和实时洪水调度方案优化提供了定量的依据,主要成果已应用于长江中下游防洪规划和防汛调度方案中.  相似文献   

基于数值模式和多普勒雷达的强对流天气预报技术   总被引：2，自引：0，他引：2  

周后福  郑媛媛  邱明燕 《气象科技》2007,35(5):637-641

基于数值预报模式MM5,结合不稳定指标和能量指标的诊断结果,得到短时潜势预警指标,进行强对流天气0~12 h的短时预报;利用多普勒雷达信息产品提供的强对流天气风暴追踪信息,提取回波的移向和移速信息,进行强对流天气0~1 h的临近预报;均用一个强对流天气过程,来具体说明短时潜势预报和临近预报状况及其与实际情况的对比;应用短时潜势预报技术对近年来强对流天气过程进行了试用。结果表明,上述方法对强对流天气的短时预报、临近预报技术有一定的预报价值。  相似文献   

Copper complexation by fulvic acid affects copper toxicity to the larvae of the polychaete Hydroides elegans   总被引：1，自引：0，他引：1  

Qiu JW  Tang X  Zheng C  Li Y  Huang Y 《Marine environmental research》2007,64(5):563-573

Copper toxicity is influenced by a variety of environmental factors including dissolved organic matter (DOM). We examined the complexation of copper by fulvic acid (FA), one of the major components of DOM, by measuring the decline in labile copper by anodic stripping voltammetrically (ASV). The data were described using a one-site ligand binding model, with a ligand concentration of 0.19micromol site mg(-1) C, and a logK' of 6.2. The model was used to predict labile copper concentration in a bioassay designed to quantify the extent to which Cu-FA complexation affected copper toxicity to the larvae of marine polychaete Hydroides elegans. The toxicity data, when expressed as labile copper concentration causing abnormal development, were independent of FA concentration and could be modeled as a logistic function, with a 48-h EC(50) of 58.9microgl(-1). However, when the data were expressed as a function of total copper concentration, the toxicity was dependent on FA concentration, with a 48-h EC(50) ranging from 55.6microgl(-1) in the no-FA control to 137.4microgl(-1) in the 20mgl(-1) FA treatment. Thus, FA was protective against copper toxicity to the larvae, and such an effect was caused by the reduction in labile copper due to Cu-FA complexation. Our results demonstrate the potential of ASV as a useful tool for predicting metal toxicity to the larvae in coastal environment where DOM plays an important role in complexing metal ions.  相似文献   

Earth fissures in Jiangsu Province,China and geological investigation of Hetang earth fissure   总被引：1，自引：0，他引：1  

G. Y. Wang  G. You  B. Shi  Z. L. Qiu  H. Y. Li  M. Tuck 《Environmental Earth Sciences》2010,60(1):35-43

Earth fissures are a geohazard in Jiangsu Province, China. They can be caused by earthquakes and active faults, underground mining, groundwater extraction and landslides. In order to establish a provincial rehabilitation plan in Jiangsu, a range of monitoring programs, surveys, geological investigations and modeling have been implemented or planned. One of the focuses of the project is the land subsidence and earth fissures caused by excessive groundwater withdrawal in Suzhou, Wuxi and Changzhou (Su-Xi-Chang) area, southern Jiangsu Province. Hetang earth fissure within the Su-Xi-Chang area was first reported in 1995 and a series of investigation has been conducted since then. The site investigations and geophysical survey in 1997 have recognized the causative factor as the excessive groundwater drawdown coupled by the underlying bedrock ridge. An open trench excavation in 2007 and a plane strain analysis suggest that Hetang earth fissures may have cracked from the bedrock ridge to ground surface. Geological drilling in 2007 has further confirmed the existence and configuration of the ridge and extracted soil samples for laboratory tests to obtain soil parameters for numerical analyses and modeling of land subsidence and earth fissures in the Su-Xi-Chang area, Jiangsu, China. The laboratory tests are currently in progress and the result of numerical analyses and modeling is expected to be presented in the near future.  相似文献   

中国再生性资源型城市创新能力与工业转型耦合协调分析     

仇方道  张春丽  郭梦梦  郑紫颜  单勇兵 《地理科学》2020,40(7):1092-1103

采用熵权TOPSIS、耦合协调度和响应度模型等方法，分析2000—2016年再生性资源型城市创新能力与工业转型耦合关系演化特征。发现：① 2000年以来中国再生性资源型城市创新能力和工业转型整体上呈提高趋势，但工业系统脆弱性依然较强，创新能力也较弱。② 再生性资源型城市创新能力与工业转型耦合协调度水平较低但有提高之势，东、中部再生性资源型城市创新能力与工业转型耦合协调状态不断改善，而西部、东北则处于失调状态；非金属、金属、能源、综合4类城市二者耦合协调性呈增强趋势，森工城市失调性加剧；大、中型再生性资源型城市创新能力与工业转型耦合协调水平改善明显，小城市创新能力与工业转型耦合协调协调性较低且持续减弱。③ 创新能力对再生性资源型城市工业转型有正向促进作用，但近年来呈减弱之势。不同类型再生性资源型城市工业转型对创新能力变化的响应程度各异。  相似文献   

Analysis and study on the influence of polarization potential in measuring geoelectric field     

Xi Jilou  Qiu Ying  Liu Chao  Han Runquan  Xu Xuegong  Shang Xianqi 《地震地磁观测与研究》2008,29(6)

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浅析飑天气现象的观测记录     

仇巧玲 《内蒙古气象》2013,(4):35-36

文章从统计临河地区(1981—2010年)30a历史资料着手,对出现的20次飑的特征进行了详细分析,并通过典型例子进一步的举例论证,又结合自己多年的观测审核经验,提出了飑的观测记录要点,供地面气象观测员在今后的工作中参考,从而防止飑的误记、漏记。  相似文献