综合利用岩石模量与品质因子信息进行储层流体识别     

杜向东 《CT理论与应用研究》2013,(3):409-420

以地震资料为主体的储层流体识别技术对现阶段油气勘探具有重要意义。本文利用岩石模量参数与品质因子作为储层流体指示因子,从提高流体指示因子估算可靠性的角度出发,分别研究了基于弹性阻抗反演的弹性模量参数直接估算方法与基于小波域QVO的品质因子估算方法。岩石模量参数直接估算方法在充分利用弹性阻抗反演高抗噪性与实用性的同时,有效地避免了间接累计误差的影响。品质因子的估算方法基于零相位子波假设,通过对小波域叠前品质因子的归零处理消除叠加平均效应。通过模型试算验证两种方法的流体判识可行性;并且结合实际资料进一步表明岩石模量与品质因子信息的综合应用可以提高储层流体的检测质量。  相似文献   

Transient analysis of 1D inhomogeneous media by dynamic inhomogeneous finite element method   总被引：1，自引：1，他引：0  

Zailin Yang  Yao Wang  Baoping Hei 《地震工程与工程振动(英文版)》2013,12(4):569-576

The dynamic inhomogeneous finite element method is studied for use in the transient analysis of one dimensional inhomogeneous media. The general formula of the inhomogeneous consistent mass matrix is established based on the shape function. In order to research the advantages of this method, it is compared with the general finite element method. A linear bar element is chosen for the discretization tests of material parameters with two fictitious distributions. And, a numerical example is solved to observe the differences in the results between these two methods. Some characteristics of the dynamic inhomogeneous finite element method that demonstrate its advantages are obtained through comparison with the general finite element method. It is found that the method can be used to solve elastic wave motion problems with a large element scale and a large number of iteration steps.  相似文献   

基于精细积分法的三维弹性波数值模拟(英文)   总被引：1，自引：0，他引：1  

段玉婷  胡天跃  姚逢昌  张研 《应用地球物理》2013,10(1):71-78

波动方程有限差分法是地震数值模拟中的一种重要的方法,对理解和分析地震传播规律、分析地震属性和解释地震资料有着非常重要的意义。但是有限差分法由于其离散化的思想,产生了不稳定性。精细积分法在有限差分法的基础上,在时间域采用解析解的表达形式,在空间域保留任意差分格式,发展成为半解析的数值方法。本文结合并发展了以往学者的成果,推导了任意精细积分法的三维弹性波正演模拟计算公式,并对其稳定性进行了数值分析。在计算实例中,实现了精细积分法二维和三维弹性波模型的地震正演模拟,对计算结果的分析表明,精细积分法反射信号走时准确,稳定性好,弹性波场相较于声波波场,弹性波波场成分更为丰富,包含了更多波型成分(PP-和PS-反射波、透射波和绕射波),这对实际地震资料的解释和储层分析有重要的意义。实践证明,该方法可直接应用到弹性波的地质模型的数值模拟中。  相似文献   

Cauchy prior distribution-based AVO elastic parameter estimation via weakly nonlinear waveform inversion     

Ji-Qiang Ma  Jian-Hua Geng 《应用地球物理》2013,10(4):442-452

Cauchy priori distribution-based Bayesian AVO reflectivity inversion may lead to sparse estimates that are sensitive to large reflectivities. For the inversion, the computation of the covariance matrix and regularized terms requires prior estimation of model parameters, which makes the iterative inversion weakly nonlinear. At the same time, the relations among the model parameters are assumed linear. Furthermore, the reflectivities, the results of the inversion, or the elastic parameters with cumulative error recovered by integrating reflectivities are not well suited for detecting hydrocarbons and fuids. In contrast, in Bayesian linear AVO inversion, the elastic parameters can be directly extracted from prestack seismic data without linear assumptions for the model parameters. Considering the advantages of the abovementioned methods, the Bayesian AVO reflectivity inversion process is modified and Cauchy distribution is explored as a prior probability distribution and the time-variant covariance is also considered. Finally, we propose a new method for the weakly nonlinear AVO waveform inversion. Furthermore, the linear assumptions are abandoned and elastic parameters, such as P-wave velocity, S-wave velocity, and density, can be directly recovered from seismic data especially for interfaces with large reflectivities. Numerical analysis demonstrates that all the elastic parameters can be estimated from prestack seismic data even when the signal-to-noise ratio of the seismic data is low.  相似文献   

An arbitrary high-order discontinuous Galerkin method for elastic waves on unstructured meshes – II. The three-dimensional isotropic case     

Michael Dumbser  Martin Käser 《Geophysical Journal International》2006,167(1):319-336

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应用响应函数技术研究岩石圈挠曲   总被引：1，自引：0，他引：1  

李雄 《大地测量与地球动力学》1993,(1)

响应函数与弹性薄板挠曲模型均用于研究地球均衡,但二者的结合为认识岩石圈流变性提供了一种重要方法。本文着重介绍二十年来在这一领域的研究进展,并阐述了大陆岩石圈基本挠曲模型的多种改进(例如考虑非完全弹性、地下负荷、地形侵蚀等)及其结果。  相似文献   

Settlements and stresses of multi‐layered grounds and improved grounds by equivalent elastic method     

Hiroyoshi Hirai 《国际地质力学数值与分析法杂志》2008,32(5):523-557

The investigation of equivalent elastic method is made to predict settlements and stresses of multi‐layered grounds and improved grounds. Analytical models to represent the heterogeneous elastic properties of layers in vertical and horizontal directions for multi‐layered grounds and improved grounds are proposed in taking into account the equivalent elastic modulus and the equivalent thickness. By introducing the equivalent thickness derived from Terzaghi's formula of the vertical stress, the equivalent elastic method of using the equivalent elastic modulus and the equivalent thickness is applied to the formulations concerning immediate settlements and vertical stresses in multi‐layered grounds and improved grounds. Comparison is performed between rigorous solutions and simulations for immediate settlements and vertical stresses in multi‐layered grounds and improved grounds. It is found that the proposed method is able to describe properly the characteristics of distributions for settlements and vertical stresses in multi‐layered grounds and improved grounds. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Vertical vibration of an elastic strip footing on saturated soil     

Y. Q. Cai  Y. M. Cheng  S. K. Alfred Au  C. J. Xu  X. H. Ma 《国际地质力学数值与分析法杂志》2008,32(5):493-508

Based on Biot's dynamic coupled equations, the vertical vibration of an elastic strip footing on the surface of saturated soil is studied. Utilizing the Fourier transform, the governing dynamic differential equations for saturated poroelastic medium are solved. Considering the mixed boundary value conditions at the bottom of the foundation, a pair of dual integral equations about the vertical vibration of an elastic strip footing is derived, which can be converted to a set of linear equations by means of infinite series of orthogonal functions. The relation between the dynamic compliance coefficients and the dimensionless frequency tends to be gentle with decreasing footing rigidity, while the dimensionless frequency has only small effect on the dynamic compliance coefficients. When the dynamic permeability is large, its effect on the dynamic compliance coefficients should be taken into consideration. Furthermore, the dynamic compliance coefficients are found to be not sensitive to Poisson's ratio of the soil for footing on saturated soil. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

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朱兆林  马在田 《大地测量与地球动力学》2007,27(5):54-58

?????????????????????????????????μ??????????????????????PML????????????????????????????PML?????????????????????????λ????????????????????????????????????????????y?????????????????????????PML??????????????????У??????????????????????·???????????????????y?????????????????????????????????????????????????????????飬???????????????Ч???  相似文献   

Finite element analyses of layered visco‐elastic system under vertical circular loading     

Q. Xu  M. S. Rahman 《国际地质力学数值与分析法杂志》2008,32(8):897-913

Analyses for the response of a linear visco‐elastic system subjected to axi‐symmetric vertical circular loading are presented. Hankel transforms with respect to the radial spatial coordinate are used to reduce the three‐dimensional problem to that involving only a single spatial dimension, which is then discretized using the finite element method. Three techniques are employed to handle the time factor in the visco‐elastic material: (i) direct time integration; (ii) Fourier transforms; and (iii) Laplace transforms. These methods are compared and evaluated through their numerical results. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献