川中地区油气藏综合化探异常模式研究     

黎绍杰 《矿产与地质》2000,14(4):260-264

总结了川中地区的油气藏综合化探异常模式类型及与油气藏类型的对应关系,并运用水平分异理论推演了随油气藏储量在不同历史附段其油气化探综合导演模式所发生的相应变化。油气藏综合化探异常模式对油气藏类型及物性具有良好的良好指示作用,可根据油气藏的综合化探异常模式进行地质反演,从而对所在地区的油气远景进行预测。  相似文献   

Effectiveness of horizontal drains for slope stability     

H. Rahardjo  K. J. Hritzuk  E. C. Leong  R. B. Rezaur 《Engineering Geology》2003,69(3-4):295-308

Horizontal drains have been commonly used in stabilising unsaturated residual soil slopes. This study examines the effectiveness of horizontal drains in stabilising residual soil slopes against rainfall-induced slope failures under a tropical climate. The study includes field instrumentation at two residual soil slopes complemented with a parametric study relating to drain position. Field monitoring results indicate that rainfall infiltration is limited to a certain depth below which infiltration becomes insignificant. This zone tends to be unsuitable for horizontal drains. Horizontal drains were found to be most effective when located at the base of a slope. The parametric study indicated conditions under which horizontal drains are effective or ineffective in improving the stability of a slope. It was also found that horizontal drains have little role in minimising infiltration in an unsaturated residual soil slope. Benefits of using horizontal drains can be obtained through the lowering of the water table.  相似文献   

中国大地测量科学发展的若干问题   总被引：8，自引：0，他引：8  

陈俊勇  文汉江  程鹏飞 《地球科学进展》2001,16(5):681-688

概述了大地测量学作为测绘基准、提供地理信息系统的基础框架作用。回顾了我国大地测量在建立国家平面基准、国家高程基准、国家重力基准等方面的情况。论述介绍了大地测量学当前发展的国际背景，提出了对我国大地测量学今后发展，如建立现代大地坐标框架和现代重力基准的目标和任务，以及改善国家高程基准等方面的考虑。  相似文献   

水平分量磁变仪的定向与定向检查     

朱兆才 《东北地震研究》1996,12(4):50-55

水平分量磁变仪定向与定向检查是保证记录质量的一项重要工作。本文研究表明，失磁下影响的的一般条件下，定向与定向检查均可用”扭头带动镜面法进行，日常可根据定向记录位置ｎ。监 状态。已有精确定向结果的标度线圈用于定向检查与校正操作简便，如果度盘进一步改进，检查精度也可以达到较高水平。  相似文献   

一种新的单部多普勒雷达反演技术   总被引：26，自引：5，他引：26       下载免费PDF全文

姜海燕  葛润生 《应用气象学报》1997,8(2):219-223

基于一些发展较强的中小尺度天气系统往往与风场的旋转或辐合、辐散有关的事实，文章提出了一种单部多普勒天气雷达径向风场反演二维水平风场的新方法，即涡度-散度方法。文中对1994年7月12日的个例进行了反演处理，处理结果与天气实况进行了对比分析，认为该方法不失为一种具有实用价值的单部多普勒雷达反演水平二维风场的方法。  相似文献   

横向雨量器的设计及由风引起的降水测量误差订正   总被引：1，自引：0，他引：1       下载免费PDF全文

黎明琴  任芝花等 《应用气象学报》2001,12(2):188-195

该文提出了横向雨量器的设计原理。经30个站7年2.8万多次的坑式雨量器、台站雨量器和横向雨量器的对比观测, 证实降水量测量的绝对差值与横向降水量呈一元幂函数关系, 相关系数达0.99。在现行的台站观测业务中, 只要增加横向雨量器的并行观测, 就可对台站雨量器测量的降水量 (包括雪量) 实施订正。订正后的精度接近于坑式雨量器的测量精度。订正方法简便易行, 可应用于业务观测。  相似文献   

华北主要构造单元及边界带现今水平形变与运动机制   总被引：26，自引：3，他引：26       下载免费PDF全文

杨国华  谢觉民  韩月萍 《地球物理学报》2001,44(5):645-653

根据华北地区12，15，16，1年高精度GPS观测结果，给出了华北地区各主要构造单元间两个时段(12-16年和16-1年)的相对水平运动.其结果为：①相对于鄂尔多斯单元，阴山单元的运动为(0-2.3)±1.6mm/a，方向约0°-W13°N，属于相对较弱左旋走滑运动.②相对于鄂尔多斯单元，晋冀鲁豫单元的运动为(4.4±1.0)-(2.5±1.5)mm/a，方向约为S50°-30°E，属于右旋型拉张运动；相对于燕山单元，则为(4.7±1.4)-(4.3±1.4)mm/a，方向约为E37°-°S，属拉张型左旋走滑运动.③相对于晋冀鲁豫单元，胶辽鲁苏单元12-16年的运动显示了顺扭的运动特征；16-1年的运动为(2.6±1.5)mm/a，保持顺扭趋势，方向约为W11°S，总体上属于北张南压的右旋走滑运动.分析表明：现今地壳构造活动与现代地壳构造运动性质基本一致，但量值有所差别；地壳运动存在着数年尺度的较明显的波动性，这可能是大陆地壳运动的一个主要特征；16-1年的运动不同于12-16年，主要表现为鄂尔多斯单元北移态势增强，山西断陷带和燕山构造带两侧拉张性有所减弱，可能是张北地震后应力调整与华北地区边界力耦合共同作用的结果.  相似文献   

富蕴地震断裂带北部细部结构特征   总被引：1，自引：0，他引：1  

柏美祥 《内陆地震》2001,15(2):97-103

以8级地震时的水平位移作为地震断裂带分段依据，富蕴地震断裂带北部引张段长17km，而且水平位移不明显。富蕴地震断裂带的主体走滑段水平位移显著，除大震时的水平位移外，发震构造具多期次活动特征。  相似文献   

The southern Rhine graben: A new view of the initial phase     

Hans?LaubscherEmail author 《International Journal of Earth Sciences》2004,93(3):341-347

One of the puzzling features of the southern end of the Rhine graben is the Dinkelberg-Tabular Jura block on the eastern shoulder of the graben. It is dissected by a large number of faults, the most notable ones forming a field of narrow little grabens and half-grabens whose bordering faults converge at the level of the Middle Triassic evaporites, which points to décollement at that horizon. The little grabens were traditionally considered to be of Oligocene age, coeval with the main taphrogenesis of the Rhine graben. Two hypotheses were offered for their formation, one ascribing them to extension on the extrados of large basement folds, the other to gravity sliding on paleoslopes. Recent field work uncovered overwhelming evidence for an Eocene age of the little grabens, the time of the initial phase of Rhine graben formation. At that time there were neither large basement folds nor paleoslopes of any significance, and therefore the two hypotheses offered until now do not work. However, the map-view pattern of the field of faults offers a somewhat unusual way out of the dilemma. This pattern is most prominently displayed in the Dinkelberg area north of the Rhine. There a lane of narrow décollement grabens with a mean NNE strike is confined within the NW- striking Dinkelberg graben, which is much wider and rooted in the basement. It is also very shallow, with a subsidence on the order of 100 m. The lane of décollement grabens forms a dextral en-échelon pattern with respect to the Dinkelberg graben, suggesting stretching of the post-evaporite sequence above a basement essentially extended by strike slip. This model, though not as clearly expressed, is also compatible with the data in the rest of the Dinkelberg-Tabular Jura block. It also fits surprisingly well a theoretical model by Withjack and Scheiner (1982) that predicts a dominance of strike-slip in the marginal area of a system consisting of extension superimposed on doming.  相似文献   

Steady-state response of a stratified half-space subjected to a horizontal arbitrary buried uniform load applied at a circular area     

A. V. Vostroukhov  S. N. Verichev  A. W. M. Kok  C. Esveld 《Soil Dynamics and Earthquake Engineering》2004,24(6):449-459

This paper outlines a method of analysis of the steady-state dynamic response of a stratified soil to a horizontal time-harmonic loading applied at a circular area. It is assumed the load to be uniformly distributed over the contact area and embedded at an arbitrary depth. It is shown that by means of application of integral Hankel transform, the problem can be reduced to a form of a single integral, which can be taken numerically. Results of the numerical simulations for an embedded horizontal impulse load are presented to demonstrate the efficiency of the developed procedure.  相似文献