Unified Finite Difference Modeling of Transient Flow in Naturally Fractured Carbonate Karst Reservoirs - A 3D Case Study

He, Jie; Killough, John; Fadlelmula, Mohamed; Fraim, Michael

doi:10.2118/175098-ms

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…To support the findings of this study we investigated the flow performances of the models generated by both methods and compared them with that of the reference model. The flow performance study was conducted in a single-phase transient flow simulator developed by He et al (2015aHe et al ( , 2015b) based on the Brinkman equation. Properties of the porous medium and the grids are listed in Table 3.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Поле нефтенасыщенности и давление нефтяной фазы на начальный момент времени могут быть посчитаны по формулам (10), (8).…”

Section: математическая модель однофазного теченияunclassified

Discrete fracture network modelling: A mathematical model

Blonsky¹,

Mitrushkin²,

Савенков

2017

KIAM Prepr.

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“…The flow between the porous medium and the karst cave is coupled by the improved B-J-S equation. Many other scholars have also studied free flow and porous medium seepage in fractured-vuggy reservoirs (Popov et al, 2007;He et al, 2015).…”

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confidence: 99%

Study on the vertical well seepage model in composite carbonate reservoirs

Minjing,

Zhan,

Jiajun

et al. 2023

Front. Earth Sci.

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Introduction: Carbonate reservoirs are widely distributed throughout the world. Due to the good physical properties of the reservoirs, they are easily contaminated by mud during drilling opening, so they are often put into production after acidification. After acidification, the near-well reservoir’s physical property is improved, while the far-well reservoir’s physical property remains unchanged. Such reservoirs are commonly called composite reservoirs. Composite carbonate reservoir seepage law is more complicated.Methods: In this paper, the point source function of a triple-medium composite reservoir is established using the source function theory, Laplace transform, perturbation transform, and linear superposition principle of partial differential equation.Results: Second, the vertical well seepage model of a composite reservoir is obtained through the new point source function.Discussion: Finally, the correctness of the model is verified, and the sensitivity analysis of the key parameters affecting the seepage law is carried out. The applicability of the model established in this paper is demonstrated by two wells in the field. This paper provides a theoretical basis for vertical well test analysis of composite reservoirs.

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Unified Finite Difference Modeling of Transient Flow in Naturally Fractured Carbonate Karst Reservoirs - A 3D Case Study

Cited by 6 publications

References 39 publications

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

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

Discrete fracture network modelling: A mathematical model

Study on the vertical well seepage model in composite carbonate reservoirs

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