层状各向同性多孔介质中井间地震的数值计算   总被引：1，自引：0，他引：1       下载免费PDF全文

张钋  李幼铭 《地球物理学报》1995,38(4):507-518

依据Ｂｉｏｔ理论，提出计算理论地震图的相应传播矩阵算法，并针对井间地震震源和检波器的不同配置进行数值计算，结果表明，本文算法高频可达１０００Ｈ２以上．文中算例说明利用震源和检波器相对于储油层的不同位置，可从反射震相记录波形上的差异，判定储油层存在与否．  相似文献   

裂隙各向异性介质波场VSP多分量记录的数值模拟   总被引：5，自引：2，他引：5       下载免费PDF全文

牛滨华  何樵登 《地球物理学报》1995,38(4):519-527

从各向异性介质中最为普遍的裂隙各向异性介质出发，推导了同零井源距ＶＳＰ三分量观测方式相一致的一维三分量波动方程．为了更符合实际观测，引入了坐标旋转，可以模拟井中任意方位的多层各向异性介质的波场响应．用有限元方法进行了波场数值模拟，重点突出了获得凡Ｒ_３×３矩阵剖面的方法，同时对Ｒ_３×３，矩阵剖面进行了一般性的分析解释，事实证明，Ｒ_３×３矩阵剖面含有介质丰富的各向异性信息．  相似文献   

成层介质中交流电测井响应   总被引：27，自引：10，他引：27       下载免费PDF全文

张庚骥  汪涵明 《地球物理学报》1995,38(6):840-849

本文给出了纵向成层、径向不均匀介质中轴对称电磁波的反射阵和透射阵的递推公式．用这些阵可以计算交流电测并响应，包括感应测并和深探测电磁波传播测井（ＤＰＴ）．同时还给出了幅度基函数和斜度基函数，它们分别＂支撑＂起结点上函数的幅度和斜度．  相似文献   

Study　on　electric　variations　of　media　in　epicentral　area　by　geomagnetic　transfer　functions   总被引：1，自引：0，他引：1  

曾小苹  林云芳  朱忠杰  续春荣  赵明  张崇阳  刘绮亮 《地震学报(英文版)》1995,8(3):413-418

ＳｔｕｄｙｏｎｅｌｅｃｔｒｉｃｖａｒｉａｔｉｏｎｓｏｆｍｅｄｉａｉｎｅｐｉｃｅｎｔｒａｌａｒｅａｂｙｇｅｏｍａｇｎｅｔｉｃｒａｎｓｆｅｒｆｕｎｃｔｉｏｎｓＸｉａｏ－ＰｉｎｇＺＥＮＧ；（曾小苹）Ｙｕｎ－ＦａｎｇＬＩＮＩ；（林云芳）Ｚｈｏｎｇ－ＪｉｅＺＨ...  相似文献   

横向非均匀介质中弹性地震波传播的数值模拟     

张剑峰  李幼铭 《地震工程与工程振动》1995,15(3):21-31

应用混合变量弹性动力学方程和线性常微分方程组的矩阵指数解法，将层状介质中广泛应用的弹性波传播矩阵解法推广至横向非均匀介质，给出了一种可计算复杂地质体中弹性波传播的广义传播矩阵数值解法。该方法可模拟任意震源及所产生的各种体波、面波，数值结果表明具有很高的计算精度。  相似文献   

Micro-scale modelling in the study of plume evolution in heterogeneous media     

E. O. Frind  E. A. Sudicky  S. L. Schellenberg 《Stochastic Environmental Research and Risk Assessment (SERRA)》1987,1(4):263-279

The migration of contaminants in heterogeneous aquifers involves dispersive processes that act at different scales. The interaction of these processes as a plume evolves can be studied by micro-scale modelling whereby two scales, a local- or micro-scale and an aquifer- or macro-scale, are covered simultaneously. Local-scale dispersive processes are represented through the local dispersion coefficient in the transport equation, while large-scale dispersion due to heterogeneities is represented through the resolution of the flow field and the diffusive exchange between streamtubes. The micro-scale model provides both the high degree of resolution compatible with local-scale processes, and the extent required for the approach to asymptotic conditions, using grids of up to a million nodal points. The model is based on the dual potential-streamfunction formulation for flow, and the transport problem is formulated in a natural coordinate system provided by the flownet. Simulations can be used to verify stochastic theories of dispersion, without the restrictive assumptions inherent in the theory. For the two-dimensional case, results indicate convergence of the effective dispersivity to the theoretical macrodispersivity value. Convergence takes place within a travel distance of about 50 correlation lengths of the hydraulic conductivity field. However, the approach taken to asymptotic conditions, as well as the macrodispersivity value, may differ for different realizations of the same medium. The influence of early-time events such as plume splitting on the asymptotic convergence remains to be investigated.  相似文献   

Risk Management for Petroleum Reservoir Production: A Simulation-Based Study of Prediction     

James Glimm  Shuling Hou  Hongjoong Kim  Yoon-ha Lee  David H. Sharp  Kenny Ye  Qisu Zou 《Computational Geosciences》2001,5(3):173-197

We consider numerical solutions of the Darcy and Buckley–Leverett equations for flow in porous media. These solutions depend on a realization of a random field that describes the reservoir permeability. The main content of this paper is to formulate and analyze a probability model for the numerical coarse grid solution error. We explore the extent to which the coarse grid oil production rate is sufficient to predict future oil production rates. We find that very early oil production data is sufficient to reduce the prediction error in oil production by about 30%, relative to the prior probability prediction.  相似文献   

考虑土体固液二相性质的地下管线地震反应研究     

艾晓秋  李杰 《地震工程与工程振动》2005,25(2):136-140

本文将管线周围的土体视为固-液二相介质，采用考虑地震过程中土体内孔隙水压力的增长和消散的有效应力分析方法，并以非线性的土体本构模型模拟土体动力特性的改变以及在孔隙水压作用下的变形，以求接近土体的真实地震反应。研究表明随着土体软化程度的不同，受到土体约束的管线应力亦发生相应变化。文中详细研究了地震动峰值、管线直径、行波波速和入射角度等对管线应力的影响。  相似文献   

Digital Image Based Approach for Three-Dimensional Mechanical Analysis of Heterogeneous Rocks   总被引：2，自引：0，他引：2  

S. Chen  Z. Q. Yue  L. G. Tham 《Rock Mechanics and Rock Engineering》2007,40(2):145-168

Summary This paper presents a digital image based approach for three-dimensional (3-D) numerical simulation and failure analysis of rocks by taking into account the actual 3-D heterogeneity. Digital image techniques are adopted to extract two-dimensional (2-D) material heterogeneity from material surface images. The 2-D image mesostructures are further extrapolated to 3-D cuboid mesostructures by assuming the material surface as a representation of the inner material heterogeneity within a very small depth. The iterative milling and scanning system is set up to generate the 3-D rock mesostructures. A Hong Kong granite specimen is used as an example to demonstrate the procedure of 3-D mesostructure establishment. The mechanical responses and failure process under the conventional Brazilian tensile test condition are examined through numerical analyses. The stress distribution, crack propagation process and failure model of heterogeneous material cases are simulated with a finite difference software. The numerical results indicate that material heterogeneity plays an important role in determining the failure behavior of rocks under external loading.  相似文献   

Ray propagator matrices in three-dimensional anisotropic inhomogeneous layered media     

Vlastislav &#;ervený  Tijmen Jan Moser 《Geophysical Journal International》2007,168(2):593-604

  相似文献