鄂尔多斯盆地北部上古生界层序地层特征与储层发育规律   总被引：21，自引：4，他引：17  

樊太亮  郭齐军 《现代地质》1999,13(1):32-36

通过地震和测井层序地层分析,可在鄂尔多斯盆地北部上古生界识别出４个地震层序,层序界面均以区域性侵蚀面或河道冲刷面为边界。层序的发育特征反映了鄂尔多斯盆地在晚古生代经历了陆表海盆地的形成、发展、衰退和逐渐消亡的过程。储集层主要是石炭系的滨岸砂体、二叠系的河道砂体以及冲积扇砂体。在层序地层体制中,储层的纵向发育受基准面升降变化旋回的控制,而平面展布受古地貌的制约。通过地震与钻井的综合分析,具体预测出有利的储集砂体分布。  相似文献   

Breaking of Solitary Waves on Uniform Slopes     

CHOU Chung-Ren OUYANG Kwan Professor 《中国海洋工程》1999,(4)

The propagation,shoaling and breaking of solitary waves on mild slopes are simulated byboundary element method.In this paper,the criterion of breaking solitary waves on mild slopes is discussed.The criterion is that the ratio of horizontal velocity of water particles on the wave crest to wave celerity equalsone.However,the case that the ratio of horizontal velocity of water particles on the wave crest to wave ce-lerity is below one but the front face of wave profile becomes vertical is also considered as a breaking criteri-on.According to the above criteria,the breaking index for slopes 1:10 to 1:25 is studied.The result is com-pared to other researchers'.The deformation of solitary waves on slopes is discussed and the distribution offluid velocities at breaking is shown.  相似文献   

Sedimentary characteristics and genetic mechanism of the giant ancient pockmarks in the Qiongdongnan Basin,northern South China Sea     

Pengfei Xiong  Cong Cheng  Zenggui Kuang  Jinfeng Ren  Jinqiang Liang  Hongfei Lai  Zigui Chen  Jiang Lu  Xiaoyu Fang  Tao Jiang 《海洋学报(英文版)》2023,42(2):120-133

In the late Miocene, giant ancient pockmarks, which are fairly rare globally, developed in the Qiongdongnan Basin. In this paper, to determine the sedimentary characteristics and genetic mechanism of these giant ancient pockmarks in the Yinggehai Formation of the Qiongdongnan Basin, based on high-resolution 3D seismic data and multiattribute fusion technologies, we analyzed the planar distribution and seismic facies of the ancient pockmarks and compared the characteristics of the ancient pockmar...  相似文献   

同位素地球化学在地震监测预测研究中的应用进展     

周启超  蒋雨函  高小其  汪倩  彭莱 《中国地震》2023,39(2):243-259

随着新观测技术和理论的进一步发展,同位素地球化学方法在地震监测预测研究中发挥了越来越重要的作用。通过同位素地球化学方法确定地下流体来源,研究地下流体循环特征,分析地震前兆异常的成因,评估地质构造活动的程度,开展地震预测研究。同位素示踪技术还可以结合深源流体监测和地球物理方法,揭示地震孕育、流体与震源之间的关系。此外,同位素地球化学还可以构建断裂带流体地球化学背景特征,用于地震监测点映震效能的评估,提高地震监测预测的准确性,为地震新监测点的布设和震情跟踪提供技术支撑。通过对现今同位素在地震监测预测中所使用的方法、技术及国内外应用情况的总结分析,力图全面认识同位素地球化学在地震监测预测应用中的现状及发展趋势。  相似文献   

地下流体在地震孕育中的主要作用与流体前兆形成机制研究进展     

施得旸  刘耀炜 《中国地震》2023,39(3):453-471

地下流体在地震孕育和前兆形成过程中起到重要作用,因此研究地下流体对地震预报至关重要。然而,由于对地震孕震环境和发震机制缺乏深入系统的认识,导致无法根据地表观察到的异常现象准确预测地震。近年来,随着地球物理、地球化学和地质学研究的不断深入,人们对地下流体有了更多新的认识,本文通过对相关研究成果的收集和总结,介绍地下流体研究的几种经典模型,分析了地下流体在地震过程中的主要作用,并探究流体前兆形成机制。研究工作对提高地震预报水平具有一定的借鉴和参考意义。  相似文献   

《长春市城市总体规划》图集的编辑制作   总被引：4，自引：1，他引：3  

孙庆荣 《海洋测绘》2004,24(2):56-58

简要阐述了用MapGIS、CoreIDRAW两种软件结合制作《长春市城市总体规划》图集的设计、编制方法,采用图层模式有效管理地图集的数据．根据实践得出了一些经验和技巧。  相似文献   

Extrusion movements of a tunnel head reinforced by finite length bolts—a closed‐form solution using homogenization approach     

Henry Wong  Didier Subrin  Daniel Dias 《国际地质力学数值与分析法杂志》2000,24(6):533-565

An analytical model on the general behaviour of a tunnel head, reinforced by finite length bolts is proposed. This model is based on the homogenization method and spherical symmetry assumption. Despite its simplicity, and in consequence its limits of validity, it does allow a quick estimation of the key design parameters: frontal displacement, extension of decompressed zone, ground stresses and bolt tension, and constitutes thereby a very useful and handy tool for design engineers. In particular, the influence of the reinforcement length, as well as other important design parameters, are studied by the proposed model. The charts resulting from the parametric studies are directly applicable. Otherwise, the comparison to a 3D numerical model is also presented in this paper. The first results provide the validation of the analytical solution, at least in terms of average extrusion movements. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Optimal design of a base isolated system for a high‐rise steel structure     

H. Kaplan  A. Seireg 《地震工程与结构动力学》2001,30(2):287-302

In a previous study (Kaplan H, Seireg A., Int. J. Comput. Appl. Technol., 2000; 13 (1/2): 25–41), the authors proposed a base isolation system for earthquake protection of structures.The system incorporates spherical supports for the base, a specially designed spring‐cam system to keep the base rigidly supported under normal conditions and to allow it to move for the duration of the earthquake under the constraint of a spring with optimized stiffness characteristics. A single‐degree‐of‐freedom structure was considered to investigate the feasibility of the concept. The simulation of the system response shows a 20 times reduction of the transmitted force as a result of using the proposed design in the considered case. This paper extends the previous study to the case of a 40‐storey steel structure subjected to the Taft as well as El Centro earthquakes. A 7.5 and 6 times reduction of the maximum transmitted force was achieved for the considered disturbances, respectively, without any adverse effects due to the tilting moment which is inherent in this type of base isolation. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

核幔耦合对地球自由核章动的激发影响   总被引：1，自引：0，他引：1       下载免费PDF全文

崔小明  孙和平  徐建桥  周江存  陈晓东 《地球物理学报》2018,61(9):3584-3591

地球自由核章动（FCN）是地幔与液核相互作用的重要动力学现象,其激发机制涉及地表流体层、地幔和地核等圈层之间的耦合,此前研究多利用地表流体层角动量数据单独研究其对FCN的激发,对核幔耦合的影响考虑不足.本文基于角动量守恒理论分析了核幔耦合对FCN周期及振幅的影响,并结合多个大气及海洋角动量函数时间序列首次估算了核幔耦合在FCN激发过程中的贡献.结果表明核幔耦合对FCN周期产生的固定和时变影响对FCN激发的作用均不可忽视,尤其时变影响可达几十个微角秒,对于进一步解释FCN时变特征非常重要;核幔耦合对FCN振幅的直接影响是地表流体层的激发与实测FCN不相符的主要原因,黏滞、电磁和地形等耗散耦合的存在对地表流体的激发振幅有67%左右的减弱效果.  相似文献   

Characteristics of eigen-system for flexural gravity wave problems     

S. Mandal  A. Chakrabarti 《地球物理与天体物理流体动力学》2017,111(4):249-281

For a class of boundary value problems associated with flexural gravity waves, characteristics of the eigen-system are analysed which are used to study the convergence of the expansion formulae in both cases of single and two layer fluids in water of finite and infinite depths. Using Green’s function technique, the spectral representations of the vertical eigenfunctions are obtained which are used along with the orthogonal mode-coupling relations to prove the convergence of the expansion formulae. Using the expansion formulae flexural gravity wave scattering due to multiple articulations in the presence of compression are investigated. The problem is studied in both the cases of single-layer and two-layer fluids in finite water depth. Effects of compressive force, stiffness of the connectors, length of the elastic plates and water depth, position of interface on wave scattering by articulated plates are studied by analysing the reflection and transmission coefficients. This procedure of proving the convergence of expansion formulae is independent of water depth. The concept and methodology for dealing with wave-structure interaction problems discussed here can be generalised to deal with problems of similar nature arising in the broad area of mathematical physics and engineering.  相似文献