泌阳凹陷安棚油田核三段储层天然裂缝特征研究   总被引：3，自引：2，他引：3  

周文  闫长辉  王洪辉  孙尚如  王志刚 《矿物岩石》2003,23(3):57-60

根据岩芯裂缝观察结果,通过与FMI,MAIN成像测井资料进行对比,系统描述天然裂缝在成像测井上的影像特征,对地层裂缝特征参数进行了确定.成果反映出核三段地层中的裂缝主要为垂直裂缝倾角在80°～90°之间.走向在100°～110°左右,宽度一般小于1 mm,裂缝长度主要在30 mm以内.  相似文献   

全球地球化学填图   总被引：19，自引：10，他引：19       下载免费PDF全文

谢学锦 《中国地质》2003,30(1):1-9

作指出了1973年至今世界上50余项地球化学填图计划中普遍存在的缺陷大都涉及分析问题。1988－1992年实施的国际地质对比计划IGCP259项目旨在使全世界地球化学填图方法标准化。在此项目中对分析问题提出了若干规定，主要是要求今后的填图计划应统一分析71种元素，痕量及超痕量元素的检出限必须低于相应的地壳丰度值及采用中国的GSD和加拿大的STSD标样系列，以使全球数据可以对比，在其后开始延续至今的全球地球化学填图计划IGCP360，旨在用极低密度采样早日覆盖全球大陆，讨论了正在实行的两种极低密度采样方案，并提出通过极低密度采集地极少量样品示范性实现IGCP259项目对分析要求的具体建议。  相似文献   

基于GIS的陕西省旬阳地区滑坡灾害危险性区划   总被引：15，自引：0，他引：15  

张桂荣  殷坤龙  刘传正  唐灿 《中国地质灾害与防治学报》2003,14(4):39-43

西部地区是我国地质灾害的重灾区。随着西部大开发战略的实施，该地区即将开展大规模的基础建设、能源开发等。区域内的经济发展与地质灾害的矛盾将不可避免地暴露出来。为解决这一问题，论文选取中国滑坡重灾区的江汉流域开展灾害危险性区划应用研究。研究区选在旬阳地区的县城近郊，通过MAPGIS软件平台及其二次开发的滑坡灾害分析系统，采用规则网格单元划分方法，运用信息量模型对该区斜坡稳定性进行了．空间定量预测，并依信息量法的结果编制了该区的危险性预测分区图。为政府部门进行土地规划决策、避免在地质灾害易发区进行大规模土地开发和工程建设提供了科学依据。  相似文献   

戈壁荒漠区金异常检查评价中存在问题探讨--合理采样介质及采样方法研究          下载免费PDF全文

张年生 《地质找矿论丛》2003,18(Z1):224-227

本文通过对甘肃北山-新疆东天山地区化探金异常检查评价过程中遇到的诸多问题进行探讨研究,如采样介质、粒度、采样方式等,初步总结出在戈壁荒漠景观条件下开展化探异常检查评价的合理工作采样方法.  相似文献   

生态地理建模中的多尺度问题   总被引：29，自引：0，他引：29  

岳天祥  刘纪远 《第四纪研究》2003,23(3):256-261

本文在分析生态地理建模内涵的基础上,讨论了生态地理建模中的尺度转换问题、跨尺度相互作用问题、空间尺度与时间尺度的关联问题和多尺度数据处理问题.由于生态地理问题的非线性、生态环境的异质性和随机事件,简单的线性尺度转换方法远不能满足生态地理建模的要求.为了从根本上解决生态地理建模中的时空尺度问题,除需要运用微分几何学和等级理论等经典方法外,还需要引入格点生成法和网格计算等现代理论和技术手段.  相似文献   

在MapInfo中实现区域对象样点布设功能   总被引：1，自引：0，他引：1  

王唤良  朱建军  张贵 《测绘工程》2003,12(4):30-32

随着GIS在森林资源管理中应用的不断深入，在GIS系统中实现林业专业抽样设计功能是非常必要的。本文使用MapBasic鳊程语言实现三种样点布设功能。操作时，用鼠标点击欲布样点区域，在弹出对话框中作出回答，就能得到样点布设图和样点坐标表。  相似文献   

Contrasting metamorphic evolution of metasedimentary rocks from the Çine and Selimiye nappes in the Anatolide belt, western Turkey   总被引：1，自引：0，他引：1  

J. L. Régnier  U. Ring  C. W. Passchier  K. Gessner  T. Güngör 《Journal of Metamorphic Geology》2003,21(7):699-721

Abstract P–T conditions, mineral isograds, the relation of the latter to foliation planes and kinematic indicators are used to elucidate the tectonic nature and evolution of a shear zone in an orogen exhumed from mid‐crustal depths in western Turkey. Furthermore, we discuss whether simple monometamorphic fabrics of rock units from different nappes result from one single orogeny or are related to different orogenies. Metasedimentary rocks from the Çine and Selimiye nappes at the southern rim of the Anatolide belt of western Turkey record different metamorphic evolutions. The Eocene Selimiye shear zone separates both nappes. Metasedimentary rocks from the Çine nappe underneath the Selimiye shear zone record maximum P–T conditions of about 7 kbar and >550 °C. Metasedimentary rocks from the overlying Selimiye nappe have maximum P–T conditions of 4 kbar and c. 525 °C near the base of the nappe. Kinematic indicators in both nappes are related to movement on the Selimiye shear zone and consistently show a top‐S shear sense. Metamorphic grade in the Selimiye nappe decreases structurally upwards as indicated by mineral isograds defining the garnet‐chlorite zone at the base, the chloritoid‐biotite zone and the biotite‐chlorite zone at the top of the nappe. The mineral isograds in the Selimiye nappe run parallel to the regional S_R foliation, parallel the Selimiye shear zone and indicate that the Selimiye shear zone formed during this prograde greenschist to lower amphibolite facies metamorphic event but remained active after the peak of metamorphism. ⁴⁰Ar/³⁹Ar mica ages and the tectonometamorphic relationship with the Eocene Cyclades–Menderes thrust, which occurs above the Selimiye nappe in the study area, suggests an Eocene age of metamorphism in the Selimiye nappe. Metasedimentary rocks of the Çine nappe 20–30 km north of the Selimiye shear zone record maximum P–T conditions of 8–11 kbar and 600–650 °C. An age of about 550 Ma is indicated for amphibolite facies metamorphism and associated top‐N shear in the orthogneiss of the Çine nappe. Our study shows that simple monophase tectonometamorphic fabrics do not always indicate a simple orogenic development of a nappe stack. Preservation in some areas and complete overprinting of those fabrics in other areas apparently occur very heterogeneously.  相似文献   

Influence of Changes in the Prevailing Synoptic Conditions on the Response of Aerosol Characteristics to Land- and Sea-Breeze Circulations at a Coastal Station     

K. Krishna Moorthy  Preetha S. Pillai  S. Suresh Babu 《Boundary-Layer Meteorology》2003,108(1):145-161

The changes in the response of near surfaceaerosol properties to land- and sea-breezecirculations, associated with the changes in the prevailing synoptic meteorological conditions, are examined for a tropical coastal station. Aerosol properties are nearly similar in both the breeze regimes (land and sea) during seasons of marine airmass while they are distinct during seasons of continental airmass. As the prevailing winds shift from continental to marine and the ambient weather changes from winter conditions to the humid monsoon season, the submicron mode, which dominated the aerosol mass-size distribution, is largely suppressed and the dominance of the super micron mode increases. During periods of continental air mass (winter), the aerosol loading is significantly higher in the land-breeze regime, (particularly in the submicron range) but as the winds shift to marine, the loading initially becomes insensitive to the breeze regimes and later becomes higher in the sea-breeze regime, particularly in the super micron range.  相似文献   

Improved methods for solving for the magnetic field in E-polarization induction problems with fixed and staggered grids     

J. T. Weaver  X. H. Pu  A. K. Agarwal 《Geophysical Journal International》1996,126(2):437-446

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柿竹园钨锡钼铋矿床合理的勘探方法及储量比例探讨     

王本淳 《湖南地质》1996,15(2):107-111

本文剖析了柿竹园钨锡钼铋矿床地勘阶段地质观察粗浅，勘探投入超前，探明储量积压、Ｂ＋Ｃ级储量比例偏大等不合理的勘查工作及其原因。在此基础上，探讨矿区合理的勘探程度，储量比例及由此带来的经济效益。  相似文献