An Improved Triple-Porosity Model for Evaluation of Naturally Fractured Reservoirs

Al-Ghamdi, Ali; Chen, Bo; Behmanesh, Hamish; Qanbari, Farhad; Aguilera, Roberto

doi:10.2118/132879-pa

Cited by 29 publications

(7 citation statements)

References 5 publications

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“…For example, when ω f is equates to 0, the model can be simplified as dual porosity slab model [26]; when χ = 0 or γ = 0, it indicates that the gas only depletes from matrix to NF [21]. Put another way, the new model can be equivalent to the traditional triple-linear model [20].…”

Section: Validation With Analytical Approachmentioning

confidence: 99%

“…El-Banbi [20] proposed a linear dual-porosity model for linear fractured reservoirs without considering the impact of desorption, diffusion. Hasan and Al-Ahmadi [21] proposed a triple-porosity linear flow model with consideration of the impact of shale gas desorption and diffusion. Zhao et al [22] proposed a triple-porosity spherical flow model for the fractured infinite shale gas reservoirs by considering the impact of diffusion and desorption.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Coupled Multifracture and Multicontinuum Models for Shale Gas Simulation by Use of Semi-Analytical Approach

et al. 2018

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Abstract:Combining the advantages of multicontinuum and multifracture representations provides an easy-to-use tool to adequately capture the characteristic of the multiscaled fracture system in shale gas reservoir. A hybrid model is established on the basis of simplified conceptual productivity assumption, where the matrix volume is divided into two sub-domains (triple-porosity model and dual-depletion flowing model) and the fracture volume is represented by discrete finite conductivity fracture. In addition, the mechanisms of instant desorption, viscous flow and dual-depletion in matrix are taken into account. The rate transient responses are then obtained by use of semi-analytical approach. Based on the model, type curves are plotted and verified by comparing with alternative reliable methods. Different flow regimes in shale gas reservoirs can be identified and detected. The Generalized Likelihood Uncertainty Estimation methodology, based on probabilistic aggregation theory, is employed to integrating those two productivity models together such that the production can be predicted more accurately. A field example is applied to validate the applicability of this new model. Finally, it is concluded that the proposed model can predict the rate and cumulative rate more easily and practically.

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Section: Validation With Analytical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Coupled Multifracture and Multicontinuum Models for Shale Gas Simulation by Use of Semi-Analytical Approach

et al. 2018

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“…Post depositional process, folding and faulting due to the tectonic activities can affect carbonate reservoir properties by inducing tensions and/or compressions and creation of openings such as joints, fissures and fractures, therefore, increasing porosity and permeability of the reservoir (Anselmetti & Eberli, 1999; Assefa et al., 2003; Hu et al., 2023; Narr & Currie, 1982; Sharifi, 2022a; Tiab & Donaldson, 2012). Moreover, spatial distribution and alignment of the microcracks and fractures in a given direction can contribute to the anisotropic behaviour of the carbonate reservoirs because fractures may show a preferred orientation based on the regional stress distribution (Alassi & Holt, 2010; Al‐Ghamdi et al., 2011; Boyeldieu & Winchester, 1982; Schlumberger, 1972; Xu & Payne, 2009). Although most pores created by primary geological processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for fracture porosity estimation of carbonate reservoirs

Sharifi

Moghaddas

Saberi³

et al. 2023

Geophysical Prospecting

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The quality of carbonate reservoirs is linked to their rock properties and surrounding stress settings which can play a vital role in their production optimization and development programs. Imposing various stresses can increase porosity and permeability by creating joints and cracks across the rock mass. Therefore, developing methods to identify and accurately evaluate fractures in carbonate reservoirs is very significant in reservoir characterization. To deal with this necessity, we developed a fracture porosity estimation method using empirical and analytical solutions based on the wireline data considering stress conditions. The proposed methodology was applied to a carbonate reservoir as the case study. As fracture porosity is sensitive to stress, experimental tests were conducted on the core samples using triaxial hydrostatic tests. These tests are needed to simulate reservoir conditions to investigate the relationships between fracture volume fraction and the applied stress. A substantial porosity loss was observed during the hydrostatic test, which can be linked to the crack porosity closure. The reliability of our results was validated by thin section, computed tomography-scan images, velocity deviation method, elastic boundary laws, and image logs. Eventually, we introduced an equation to estimate in situ fracture porosity from the relationship between porosity and effective confining pressure. We verified the repeatability and generality of our proposed methodology using a blind well, and the results indicate a comparable level of accuracy. Our findings are applicable for estimating crack porosity for rock physics modelling purposes of detecting fracture zones in the absence of image logs and core data. Moreover, by calibrating and optimizing the constant parameters in our proposed relationship, one may further estimate crack density in any other given carbonate reservoirs.

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“…The challenge for the fractured reservoir evaluation lies in the coexistence of cracks and pores . The accurate saturation evaluation in fractured rocks requires an understanding of the dual-porosity system. , Generally, it is assumed that matrix pore and crack are parallel in their equivalent resistant circuit; , hence, the dual-porosity model can be used to describe rock-electric characteristics in fractured reservoirs. − …”

Section: Introductionmentioning

confidence: 99%

Study on Rock-Electric Characteristics of Cracked Porous Rocks by the Novel Multifactor Conductivity Model

Meng,

Ye,

Yang

et al. 2023

ACS Omega

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Due to the influence of multiple factors on the conductive properties of rocks, the Archie’s formula, considering only a single factor, makes it difficult to reasonably explain rock-electric characteristics of cracked porous rocks. In order to better describe the conductive mechanism of cracked porous rocks, a generalized multifactor conductivity model was proposed by considering and introducing multiple influencing factors such as the series-parallel structure, conductive matrix, cracks, and fluids, which is conducive to more accurate research on the conductive mechanism of rocks. It should be noted that the developed model is not only applicable to cracked porous rocks but also useful for porous rocks. Through the study and analysis of various influencing factors, it is demonstrated by the simulation results that both the conductive matrix and cracks improve the conductive ability, which are crucial factors resulting in the non-Archie behavior and low-resistivity pay zone, and rock conductivity is more sensitive to the conductive matrix and cracks in tight reservoirs with porosity below 10%. Furthermore, experimental data are available to validate the novel multifactor conductivity model, and the comparison results show its advantages in predicting and explaining the conductive properties of cracked porous rocks.

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An Improved Triple-Porosity Model for Evaluation of Naturally Fractured Reservoirs

Cited by 29 publications

References 5 publications

Hybrid Coupled Multifracture and Multicontinuum Models for Shale Gas Simulation by Use of Semi-Analytical Approach

Hybrid Coupled Multifracture and Multicontinuum Models for Shale Gas Simulation by Use of Semi-Analytical Approach

A novel approach for fracture porosity estimation of carbonate reservoirs

Study on Rock-Electric Characteristics of Cracked Porous Rocks by the Novel Multifactor Conductivity Model

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