Mn content of reservoir calcite cement: A novel inorganic geotracer of secondary petroleum migration in the tectonically complex Junggar Basin (NW China)   总被引：1，自引：0，他引：1  

Cao Jian  Hu WenXuan  Yao SuPing  Zhang YiJie  Wang XuLong  Zhang YueQian  Tang Yong  Shi XinPu 《中国科学D辑(英文版)》2007,50(12):1796-1809

Electronic probe microanalysis(EPMA) results of reservoir calcite cement from fourteen core samples in the Junggar Basin show that Mn-content varies largely between different samples from below the detect limitation to 4.14%,while it displays a generally good correlation with oil-gas shows.This,therefore,likely indicates that concentration of the Mn-content of the calcite cement has a close rela-tion to the intensity of petroleum fluid charging during hydrocarbon secondary migration.In order to assess this hypothesis,oxygen and strontium isotopic measurements on sixteen calcite veins host in source sequences were carried out to investigate the feature of the oil-source petroleum fluid.Analytical results imply that during hydrocarbon generation and migration,deep hot fluid has dissolved volcanic minerals interlined between mudstone source rocks.As Mn is a kind of typical trace element enriched in volcanic rocks,it is reasonable to conclude that the petroleum fluid formed in the source sequences would be Mn-rich.Consequently,calcite cements precipitated from such Mn-rich petroleum fluid would be Mn-rich accordingly.Due to the geologic chromatographic effect during migration along reservoir rocks,the decreasing of the Mn-content of the reservoir calcite cements indicates the migration direction.Then,this novel geotracer was further successfully applied in the study of hydrocarbon migration in the Junggar Basin in combination with organic geochemical analyses during the hydrocarbon migration.The Mn content of the reservoir calcite cement appears promising as a novel inorganic geotracer for the petroleum migration.This paper represents a search for novel indicators of secondary petroleum migration in tectonically complex basins based on fundamentals of the reservoir fluid-rock interactions.  相似文献   

自动气象站维护及操作技巧   总被引：1，自引：0，他引：1  

栾永卫  曹兴锋 《山东气象》2007,27(4):51-52

对自动气象站软件、硬件及网络通信三个方面的主要故障现象进行了总结,介绍了使用维护注意事项和技巧,提出了故障排除方法。  相似文献   

交互式数据语言在气象数据可视化中的应用          下载免费PDF全文

曾财兴  曹长尧 《气象科技》2007,35(B12):65-66,94

科学计算可视化是20世纪80年代后期随着计算机图形学应用的拓广而发展起来的一个新的研究分支，受其推动，数字信息的可视化成为20世纪90年代研究的前缘。随着“数字地球”、“数字城市”、“数字油田”等概念的提出，气象工作者迫切需要更加精确地了解各种气象数据和地形实体。而对于这些复杂的数据资料，目前人们已不能满足于等线图那样的平面描述，更需要建立三维图像，用更接近实际的方式去描述它，从各个不同角度观察它，三维可视化就是实现以上目标的有效手段。实体三维可视化技术是描绘和理解三维实体的一种重要计算机技术，它可以帮助使用者快速、准确理解和描述三维实体，并能协助快速选定感兴趣的目标，为分析、理解数据提供了有利工具。  相似文献   

雨涝灾害对舞钢市棉花生产的影响     

付世权  曹春田  臧学斌  朱柳松  王俊香  王丽英  王梅香 《河南气象》2007,(Z1)

通过田间调查,对2004-2006年棉花不同阶段雨涝情况对棉花生育及产量构成的影响进行了比较分析,并提出了相应的抗灾减灾对策。  相似文献   

GPS精密单点定位(静态)影响收敛速度的因素分析     

曹相  高成发 《现代测绘》2007,30(1):19-21

GPS精密单点定位是最近几年发展起来的一项GPS定位新技术,是目前GPS界研究的热点之一.本文简要介绍了GPS精密单点定位的原理,通过对实验数据的处理,计算出利用IGS分析中心提供的五种精密星历和卫星钟差进行单点定位所能达到的精度,又较为详细的分析了影响收敛速度的因素,得出COD的定位精度是最高的,其收敛速度也是最快的,另外减小对流层延迟和GDOP大小对提高收敛速度也是有效的方法.  相似文献   

Validating the Runoff from the PRECIS Model Using a Large-Scale Routing Model   总被引：4，自引：0，他引：4  

曹丽娟  董文杰  许吟隆  张勇 《大气科学进展》2007,24(5):855-862

The streamflow over the Yellow River basin is simulated using the PRECIS （Providing REgional Climates for Impacts Studies） regional climate model driven by 15-year （1979-1993） ECMWF reanalysis data as the initial and lateral boundary conditions and an off-line large-scale routing model （LRM）. The LRM uses physical catchment and river channel information and allows streamflow to be predicted for large continental rivers with a 1°×1° spatial resolution. The results show that the PRECIS model can reproduce the general southeast to northwest gradient distribution of the precipitation over the Yellow River basin, The PRECIS- LRM model combination has the capability to simulate the seasonal and annual streamflow over the Yellow River basin. The simulated streamflow is generally coincident with the naturalized streamflow both in timing and in magnitude.  相似文献   

Carbon isotopic composition of modern soil and paleosol as a response to vegetation change on the Chinese Loess Plateau   总被引：7，自引：0，他引：7  

LIU Weiguo  NING Youfeng  AN Zhisheng  WU Zhenghai  LU Huayu & CAO Yunning State Key Laboratory of Loess  Quaternary Geology  IEE  Chinese Academy of Sciences  Xi''''an  China Northwest Sci-Tech University of Agriculture  Forest  Yangling  China 《中国科学D辑(英文版)》2005,48(1):93-99

The relationship between the carbon isotopic composition of paleosols and pale-ovegetation on the Loess Plateau is still unclear. One of the main reasons is that we are short of knowledge about the characteristics of the carbon isotopic composition of modern soil in this area. A preliminary investigation of the carbon isotopic compositions of the modern soil and the loess/paleosol sequence on the Loess Plateau shows that the carbon isotopic composition of modern soil is consistent with the distribution of modern plants on the Loess Plateau, where the ecosystem is dominated by a mixture of C4 and C3 plants. Comparing the δ13C values of modern soil and loess-paleosol sequences from the Xunyi profile, we conclude that C3 plants dominated the landscape during loess sediment stages, while C4 plants expanded during paleosol stages.  相似文献   

Nitrogen isotopic geochemical characteristics of crude oils in several basins of China     

CHEN Chuanping    MEI Bowen & CAO Yacheng . Jianghan Petroleum University  Jingzhou  China  . Huazhong University of Science  Technology  Wuhan  China  . Nanjing Institute of Soil Science  Chinese Academy of Sciences  Nanjing  China 《中国科学D辑(英文版)》2005,48(8):1211-1219

Nitrogen occupies a high content in crust and in atmospheric circle. It is one of the main elements in organism and an important element in sedimentary circle. Although nitrogen is little in crude oil, to a cer-tain degree, it influences the physical and chemical properties of oil, such as viscosity and density[1]. In reservoir the nitrogen-bearing compounds can form ion bonds or hydrogen bonds with substances on rock and form van der Vaals’ force among moleculae so they affect and alter the …  相似文献   

Impacts of land-use and climate changes on ecosystem productivity and carbon cycle in the cropping-grazing transitional zone in China   总被引：4，自引：0，他引：4  

GAO Zhiqiang  LIU Jiyuan  CAO Mingkui  LI Kerang & TAO Bo Institute of Geographic Sciences  Natural Resources Research  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(9):1479-1491

Terrestrial ecosystems are both a carbon source and sink, therefore play an important role in the global carbon cycle that act as a link of interactions between human activities and climate changes[1,2]. Climate change impacts ecosystem carbon cycle through af- fecting biological processes, e.g. plant photosynthesis, respiration, and soil carbon decomposition. Land-use change directly modifies the distribution and structure of terrestrial ecosystems and hence the carbon storage and fluxes. Usi…  相似文献   

Photometric studies of three Be stars     

Gao Wei-shi  Guo Xiao-zhen  Guo Yu-lian  Cao Hui-lai 《Chinese Astronomy and Astrophysics》1981,5(3):349-356

From 1978 December to 1979 May, we made spectrographic observations of φPer, ζTau and κDra using our Schmidt cassegrain grating spectrograph. Values of electron density, rotational speed and variation have been obtained and a comparison between ζTau and the supergiant βOri carried out. We found that, over our observed period, θPer showed clear shell activities, ζTau was in a relatively calm phase, its shell slowly expanding, while κDra had all the signs of a “classical” Be star.  相似文献