Permeability analysis of fractured vuggy porous media based on homogenization theory

Huang, Zhaoqin; Ye, Jun; Li, Yajun; Wang, Chenchen; Lu, Xinrui

doi:10.1007/s11431-009-0397-5

Cited by 42 publications

(30 citation statements)

References 16 publications

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“…(26), and that only the matrix's capillary pressure is considered. For matrix, threshold value p d =1000 Pa,  equals 1.0.…”

Section: Examples and Discussionmentioning

confidence: 99%

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Numerical study on two-phase flow through fractured porous media

Huang

Wang

et al. 2011

Sci. China Technol. Sci.

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Based on the flux equivalent principle of a single fracture, the discrete fracture concept was developed, in which the macroscopic fractures are explicitly described as (n1) dimensional geometry element. On the fundamental of this simplification, the discrete-fractured model was developed which is suitable for all types of fractured porous media. The principle of discrete-fractured model was introduced in detail, and the general mathematical model was expressed subsequently. The fully coupling discrete-fractured mathematical model was implemented using Galerkin finite element method. The validity and accuracy of the model were shown through the Buckley-Leverett problem in a single fracture. Then the discrete-fractured model was applied to the two different type fractured porous media. The effect of fractures on the water flooding in fractured reservoirs was investigated. The numerical results showed that the fractures made the porous media more heterogeneous and anisotropic, and that the orientation, size, type of fracture and the connectivity of fractures network have important impacts on the two-phase flow. fractured porous media, two-phase flow, discrete fracture, numerical simulation Citation:

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“…(26), and that only the matrix's capillary pressure is considered. For matrix, threshold value p d =1000 Pa,  equals 1.0.…”

Section: Examples and Discussionmentioning

confidence: 99%

“…However, in actual formation, some fractures may be barriers that prevent flow across them, e.g., faults and fractures filled with mud [26,27]. Therefore, establishing a common and practical fluid flow mathematical model and corresponding numerical simulation method is significant and imperative.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on two-phase flow through fractured porous media

Huang

Wang

et al. 2011

Sci. China Technol. Sci.

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“…Chai and Xu [84] and Hu et al [85] pointed out that seepage is unfavorable for dam global stability, especially the sudden change of water level would cause the variation of seepage field in the foundation rock, which is more like to introduce the local damage in rock foundation. Yang et al [86] and Huang et al [87] studied the seepage-stress coupling with meso-mechanics approach and obtained some meaningful results. In [88][89][90][91][92], some approaches were proposed to handle the temperature-seepagestress coupling problem, and some progresses were obtained both for engineering practice and further research.…”

Section: The Damage Mechanism Of Dam Concrete and Foundation Rockmentioning

confidence: 99%

Research advance in failure risk and local strength failure for high arch dams

Ren

Liu

2012

Chin. Sci. Bull.

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To develop national economy and use the water resources and hydropower resources sufficiently, a lot of high arch dams, with the height of more than 200 m, have been and will be built in China. Although arch dams have good mechanical behavior, there is still failure possibility due to the huge water pressure and high stress level in dam, complex topographic and geologic conditions, formidable environment and high intensity earthquake. As one of the three main aspects concerning the safety of high arch dam, the study on global destruction, has been elaborated in the literatures, and research advance in the other two aspects, namely the failure risk and local damage of high arch dams, will be reviewed in this paper. In recent years, the failure risk of high arch dams has been investigated, and the model for identifying dam failure risk factors has been established. It is shown that the foundation deterioration and strong earthquake are the major risk sources for high dam failure. With the fault tree method, the failure mode and failure probability of high arch dams are studied, and the principle for determining failure mode and the method of calculating failure probability are proposed. Meanwhile, the determination principle of acceptable risk standard for high arch dam was proposed, and the acceptable risk rate and the acceptable standard value of various risk losses were given. For the local damage of arch dam, it is pointed out that the local damage belongs to the strength failure at material level. The study on local failure mechanism of arch dam is reviewed, based on the theories that from traditional strength theory to damage mechanics and meso-mechanics theory. Aiming at the cracking, the main pattern of local failure of high concrete dam, the research advances in the analysis methods and cracking criteria for smeared crack model and discrete crack model are summarized, and the research findings of preventive measures for local failure are shown. high arch dam, failure risk, local damage, research advance Citation:Ren Q W, Li Q, Liu S. Research advance in failure risk and local strength failure for high arch dams. Chin Sci Bull, 2012Bull, , 57: 46724682, doi: 10.1007 To develop national economy, to save energy and to reduce emission, exploitation and utilization of water resources and hydropower resources are continued in China. At present, the height of arch dams under construction and to be built are of 300 m high level, such as Jinping arch dam (305 m high), Xiaowan arch dam (294.5 m high), Xiluodu arch dam (285.5 m high), and Baihetan arch dam (289 m high). The construction scale and difficulty of these dams are beyond the current design specifications, and there is hardly successful precedential reference. Moreover most of these high arch dams are located in the western region of China, where the topographic and geologic conditions are quite complex, with harsh environment and high seismic intensity as well as frequent geological disasters. In addition the resistance of dam and foundation may be red...

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“…The discontinuum approach, on the other hand, better represents such complex flow patterns because it characterizes them as discrete features with all the variety of their distinct geology. Huang et al (2010) were the first to propose and use a discontinuum approach called discrete fracture-vug network (DFVN) in modeling fractured-vuggy reservoir. In their work they proposed a mathematical flow model of DFVN and based on a two-scale homogenization limit theory, they obtained a microscopic Darcy's law that governs the flow in the media on coarse scale.…”

Section: Introductionmentioning

confidence: 99%

Discrete Fracture-Vug Network Modeling in Naturally Fractured Vuggy Reservoirs Using Multiple-Point Geostatistics: A Micro-Scale Case

Fadlelmula

Fraim

et al. 2015

SPE Annual Technical Conference and Exhibition

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Most of the world's massive fields produce from naturally fractured vuggy carbonate reservoirs. However, modeling such reservoirs is a challenging task due to the co-existence of porous and free-flow domains over a wide range of scales. Realistic characterization of fractured vuggy reservoirs requires preservation of the geological structure and reproduction of patterns. In this study, we model a discrete fracture-vug network using microtomography and multiple-point geostatistics (MPG) modeling technique. For this purpose, one micro-CT scan image of a real core is used to generate a micro-scale geological model (the reference model and the first training image) having three structures; matrix, fractures, and vugs.The structures in the reference model are also separated into matrix-fracture and matrix-vug to construct two other training images. The three training images are then used in MPG to generate multiple equiprobable models that mimic the original networks of the fractures and vugs. The models created using matrix-fracture and matrix-vug training images are combined into fracture-vug-matrix models by superimposing the fracture networks from the matrix-fracture models on their corresponding matrix-vug models. The spatial continuity, patterns reproduction, and flow performance of the generated models are compared with those of the reference model. The results show that, although the fracture patterns are not well reproduced, all the generated realizations preserved the structures and reproduced the spatial continuity of the reference model. In addition, the study revealed that the flow curves of the models generated with the introduced combined MPG method bracket better with the curve of the reference model than those of the direct MPG method. These results lay the foundation for future application of the presented method to field-scale modeling of naturally fractured vuggy reservoirs.

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Permeability analysis of fractured vuggy porous media based on homogenization theory

Cited by 42 publications

References 16 publications

Numerical study on two-phase flow through fractured porous media

Numerical study on two-phase flow through fractured porous media

Research advance in failure risk and local strength failure for high arch dams

Discrete Fracture-Vug Network Modeling in Naturally Fractured Vuggy Reservoirs Using Multiple-Point Geostatistics: A Micro-Scale Case

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