Stress sensitivity of carbonate gas reservoirs and its microscopic mechanism

Cheng, Youyou; GUO, Chunqiu; CHEN, Pengyu; Shi, Hongxing; Tan, Chengqian; CHENG, Muwei; Xing, Yuzhong; Luo, Xiang

doi:10.1016/s1876-3804(22)60377-x

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…Based on the core test data, the relationship between porosity and permeability can be fitted to the equation shown in Figure 8a. COSTA indicated that the expression for reservoir permeability considering the fractal dimension can be written as Equation (14) [30]; assuming that the tortuosity of different pore scales remains unchanged, the porosity term φ/(1 − φ) (2−D BC )/ in Equation ( 14) can be rewritten as Φ. The relationship between porosity term (Φ) and permeability was refitted, resulting in Figure 8b.…”

Section: The Influence Of Fractal Dimension On Reservoir Physical Pro...mentioning

confidence: 99%

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Description of Pore Structure of Carbonate Reservoirs Based on Fractal Dimension

Cheng,

Luo,

Zhuo

et al. 2024

Processes

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The complexity and heterogeneity of pore structures in carbonate reservoirs pose significant challenges for accurately characterizing the influence of different pore micro-parameters on reservoir physical properties. Drawing upon the principles of fractal geometry theory applied to reservoir rocks, this study combines mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) T2 spectrum methods to explore the relationship between the fractal dimension and micro-parameters of pore throats at various scales. Additionally, it clarifies how the fractal dimension of pores at different scales impacts reservoir physical properties. Moreover, a permeability prediction model that incorporates fractal dimensions is developed. The findings demonstrate that the fractal dimension effectively captures the complexity and multi-scale nature of reservoir microstructures, leading to higher reliability in predicting permeability when using the model incorporating the fractal dimension. It provides a theoretical basis for predicting the absolute permeability of fractured carbonate rocks in dual media.

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Section: The Influence Of Fractal Dimension On Reservoir Physical Pro...mentioning

confidence: 99%

“…In recent years, low-field Processes 2024, 12, 825 2 of 13 nuclear magnetic resonance (LF-NMR) technology has gradually gained widespread use in characterizing rock pore structures due to its fast speed, accuracy, and preservation. An essential issue when applying LF-NMR is how to effectively convert relaxation time into pore size [14,15].…”

Section: Introductionmentioning

confidence: 99%

Description of Pore Structure of Carbonate Reservoirs Based on Fractal Dimension

Cheng,

Luo,

Zhuo

et al. 2024

Processes

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“…30 The micromechanisms of stresssensitive injury for carbonate reservoirs are mainly fracture closure, pore elastic contraction, and plastic deformation of the skeleton. 31 At present, scholars commonly use permeability stress sensitivity evaluation on the industry standard SY/T 5358-2010 to analyze the rock permeability stress sensitivity, and there are scholars based on the permeability sensitivity results of different rocks to propose improvements to the method. 32,33 However, there are few studies about the different rocks of the permeability sensitivity combined with the elastic parameter stress sensitivity analysis, and the studies did not consider the in situ stress condition.…”

Section: Introductionmentioning

confidence: 99%

“…Stress sensitivity hysteresis in pressurized-unpressurized stage increases with the increase of deformation parameters of the rock . The micromechanisms of stress-sensitive injury for carbonate reservoirs are mainly fracture closure, pore elastic contraction, and plastic deformation of the skeleton …”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Stress Sensitivity Characterization and Reservoir Quality Evaluation of Yingxiongling Shale in Qaidam Basin

Liu,

Shen,

Gao

et al. 2024

Energy Fuels

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Yingxiongling shale is characterized by high-frequency cyclic deposition, and the rocks in the area are classified into five rock types, which means that this area has complex geological features. Different types of rocks have nonhomogeneity and unclear stress sensitivity characteristics, which are important for reservoir stimulation and production. In this paper, the permeability stress sensitivity characteristics of different types of rocks are evaluated based on the elastic parameter stress sensitivity results, and the stress sensitivity parameters of rocks in the in situ stress state are proposed. The reservoir engineering quality of different types of rocks is evaluated by combining their microscopic pore characteristics with stress sensitivity characteristics. The results show that the stress sensitivity characteristics of different types of rocks are affected by the number of laminae and clay mineral content, the elastic parameter stress sensitivity of laminated rocks is stronger than that of layered rocks, and that of argillaceous rocks is stronger than that of limy rocks in layered shale. The permeability stress sensitivity of layered rocks is stronger than that of laminated rocks, that of argillaceous rocks is stronger than that of limy rocks in layered shale, and that of sandstone is the strongest. The laminated rocks are more capable of forming cracks and have better pore connectivity than the layered rocks. Finally, based on the elastic parameter stress sensitivity coefficient, a new coefficient is proposed to improve the permeability stress sensitivity, and the improved permeability stress sensitivity coefficient is used to evaluate the permeability characteristics of the reservoir under the in situ stress. Then, the quality of the main reservoirs was evaluated by the new parameters; the reservoir quality of laminated limy shale was the best and that of layered argillaceous shale was the worst. This study provides theoretical support for the target layer preference of Yingxiongling shale and highly efficient development.

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“…Numerous scholars have conducted laboratory experiments to study the relationship between reservoir permeability and effective stress [17][18][19][20]. They have investigated the impact of different reservoir characteristics, such as confining pressure, rock type, and the degree of fracturing on rock sample permeability.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism of Stress Sensitivity Changes in Ultra-Deep Carbonate Reservoirs

Cai,

Jiang,

Liu

2024

Applied Sciences

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Quantitative evaluation of stress sensitivity of ultra-deep carbonate reservoirs has been one of the challenges in exploration and development, and the problem of permeability loss law in ultra-deep carbonates under variable stress conditions has not been solved so far and further research is urgently needed. Through experimental and numerical simulation methods, the stress-sensitive evaluation equations were established based on matrix-type carbonate and fractured carbonate reservoirs, the stress-sensitive changes under different Young’s modulus were discussed, and the degree of permeability loss under different stresses was evaluated. Finally, the dual-media model of ultra-deep carbonate was established, and the practical application was carried out in the Shunbei area of the Tarim Basin. Studies have shown that (1) under the same effective stress, the stress sensitivity of matrix-type and fracture-type carbonate reservoirs is related to the Young’s modulus of the rock skeleton. In matrix-type carbonate reservoirs, rocks with a larger Young’s modulus have smaller rigidity and stronger stress sensitivity. In fracture-type carbonate reservoirs, the stress sensitivity is relatively weak under a smaller Young’s modulus, and relatively strong under a larger Young’s modulus. (2) Measured under the conditions of 87 MPa of peripheral pressure, 50 MPa of flow pressure, and 120 °C, the effective stress of matrix-type carbonate reservoirs has an exponential relationship with the permeability of reservoirs. The degree of stress sensitivity for fracture-type is generally higher than that of matrix-type reservoirs, and the smaller the Young’s modulus, the larger the difference in stress sensitivity. (3) The stress sensitivity of typical ultra-deep carbonates in the Shunbei area of the Tarim Basin is higher by establishing a dual-porosity model based on the initiating pressure gradient, which supports new evidence for the characteristics of ultra-deep carbonates with high-stress sensitivity. In actual production, the impact of stress sensitivity on the reservoir volume calculation and efficient development of ultra-deep carbonate reservoirs requires critical attention.

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Stress sensitivity of carbonate gas reservoirs and its microscopic mechanism

Cited by 10 publications

References 11 publications

Description of Pore Structure of Carbonate Reservoirs Based on Fractal Dimension

Description of Pore Structure of Carbonate Reservoirs Based on Fractal Dimension

Laboratory Study of Stress Sensitivity Characterization and Reservoir Quality Evaluation of Yingxiongling Shale in Qaidam Basin

Study on the Mechanism of Stress Sensitivity Changes in Ultra-Deep Carbonate Reservoirs

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