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   

Ray propagator matrices in three-dimensional anisotropic inhomogeneous layered media     

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

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Density-dependent dispersion in heterogeneous porous media Part I: A numerical study   总被引：1，自引：0，他引：1  

Anke Jannie Landman  K. Johannsen  Ruud Schotting   《Advances in water resources》2007,30(12):2467-2480

In this paper, we describe carefully conducted numerical experiments, in which a dense salt solution vertically displaces fresh water in a stable manner. The two-dimensional porous media are weakly heterogeneous at a small scale. The purpose of these simulations, conducted for a range of density differences, is to obtain accurate concentration profiles that can be used to validate nonlinear models for high-concentration-gradient dispersion. In this part we focus on convergence of the computations, in numerical and statistical sense, to ensure that the uncertainty in the results is small enough.Concentration variances are computed, which give estimates of the uncertainty in local concentration values. These local variations decrease with increasing density contrast. For tracer transport, obtained longitudinal dispersivities are in accordance with analytical findings. In the case of high-density contrasts, stabilizing gravity forces counteract the growth of dispersive fingers, decreasing the effective width of the transition zone. For small log-permeability variances, the decrease of the apparent dispersivity that is found is in agreement with laboratory results for homogeneous columns.  相似文献   

3D image-based characterization of fluid displacement in a Berea core     

M. Prodanović  W.B. Lindquist  R.S. Seright 《Advances in water resources》2007

Improved network flow models require the incorporation of increasingly accurate geometrical characterization of the microscale pore structure as well as greater information on fluid–fluid interaction (interfaces) at pore scales. We report on three dimensional (3D) pore scale medium characterization, absolute permeability computations for throat structures, and pore scale residual fluid distribution in a Berea core. X-ray computed microtomography combined with X-ray attenuating dopants is used to obtain 3D images of the pore network and to resolve phase distributions in the pore space.  相似文献   

Inversion of interference hydraulic pumping tests in both homogeneous and fractal dual media     

Frederick Delay  Anne Kaczmaryk  Philippe Ackerer 《Advances in water resources》2007

This work proposes a complete method for automatic inversion of data from hydraulic interference pumping tests based on both homogeneous and fractal dual-medium approaches. The aim is to seek a new alternative concept able to interpret field data, identify macroscopic hydraulic parameters and therefore enhance the understanding of flow in porous fractured reservoirs. Because of its much contrasted sensitivities to parameters, the dual-medium approach yields an ill-posed inverse problem that requires a specific optimization procedure including the calculation of analytical sensitivities and their possible re-scaling. Once these constraints are fulfilled, the inversion proves accurate, provides unambiguous and reliable results. In the fractal context inverting several drawdown curves from different locations at the same time reveals more accurate. Finally, hydraulic parameters drawn from inversion should be taken into account to improve in various situations the conditioning of up-scaled flow in fractured rocks.  相似文献   

Coarsening of three-dimensional structured and unstructured grids for subsurface flow     

Jørg Espen Aarnes  Vera Louise Hauge  Yalchin Efendiev 《Advances in water resources》2007

We present a generic, semi-automated algorithm for generating non-uniform coarse grids for modeling subsurface flow. The method is applicable to arbitrary grids and does not impose smoothness constraints on the coarse grid. One therefore avoids conventional smoothing procedures that are commonly used to ensure that the grids obtained with standard coarsening procedures are not too rough. The coarsening algorithm is very simple and essentially involves only two parameters that specify the level of coarsening. Consequently the algorithm allows the user to specify the simulation grid dynamically to fit available computer resources, and, e.g., use the original geomodel as input for flow simulations. This is of great importance since coarse grid-generation is normally the most time-consuming part of an upscaling phase, and therefore the main obstacle that has prevented simulation workflows with user-defined resolution. We apply the coarsening algorithm to a series of two-phase flow problems on both structured (Cartesian) and unstructured grids. The numerical results demonstrate that one consistently obtains significantly more accurate results using the proposed non-uniform coarsening strategy than with corresponding uniform coarse grids with roughly the same number of cells.  相似文献   

裂隙岩体地下水溶质运移的尺度问题   总被引：7，自引：1，他引：7       下载免费PDF全文

王锦国  周志芳 《水科学进展》2002,13(2):239-245

核废料的安全贮存、地下污染的预测控制等目前面临的许多重大问题要求对大尺度裂隙岩体地下水溶质运移问题进行研究,然而裂隙岩体地下水溶质运移问题的尺度效应给这项研究带来了极大的挑战.本文介绍了裂隙岩体地下水溶质运移的多尺度概念模型及其物理和数学模拟方法,并探讨了模拟尺度与观测尺度、预测尺度、裂隙介质尺度之间的关系及尺度效应的分形特征.  相似文献   

横向各向同性介质中的弹性波方程逆时偏移及其成像条件   总被引：1，自引：3，他引：1  

李国发  熊金良  何兵寿 《物探化探计算技术》2002,24(4):289-293,327

作者在本文中导出了在横向各向同性介质情况下，二维弹性波逆时传播的高阶差分格式，实现了弹性波在数值空间中的逆时延拓，从snell定量出发，采用插值法求取网格空间中各点的直达波旅行时，以此作为弹性波逆时偏移的成像条件，实现多波多分量资料的逆时偏移，数值试验表明，逆时偏移能够使地表接收到的波场准确归位，提高资料处理的精度。  相似文献   

Characterization of granite matrix porosity and pore-space geometry by in situ and laboratory methods   总被引：3，自引：0，他引：3  

M. Schild  S. Siegesmund  A. Vollbrecht  M. Mazurek 《Geophysical Journal International》2001,146(1):111-125

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