Microstructure Characterization Techniques for Shale Reservoirs: A Review

Qian, Yujing; Gao, Ping; Fang, Xianglong; Sun, Fengrui; Cai, Yidong; Zhou, Yingfang

doi:10.3389/feart.2022.930474

Cited by 13 publications

(6 citation statements)

References 62 publications

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“…Sand production can lead to problems such as reduced reservoir permeability and equipment damage. Chemical sand control methods can improve reservoir stability and effectively prevent SEM working principle and SEM image (A), CT working principle and CT image (B) (Lai et al, 2018;Qian et al, 2022;Liu et al, 2023).…”

Section: Conclusion Challenges and Prospectsmentioning

confidence: 99%

Chemical sand production control: a review of materials, methods and characterization

Xu,

Shen,

Zhou

et al. 2024

Front. Energy Res.

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Sand production is one of the challenges facing the oil industry. This paper reviews the latest research advances in chemical sand control and aims to provide a reference for related researchers. Firstly, the commonly used chemical sand control materials are introduced. Second, recent advances in chemical sand control are reviewed, including materials, methods, and processes. Third, laboratory methods for sand control research are presented. Finally, the gaps and challenges of chemical sand control materials are pointed out, and possible future directions for chemical sand control methods are envisioned.

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Section: Conclusion Challenges and Prospectsmentioning

confidence: 99%

Chemical sand production control: a review of materials, methods and characterization

Xu,

Shen,

Zhou

et al. 2024

Front. Energy Res.

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“…On one hand, fractures play a role in connecting oil and gas and increasing reservoir permeability; On the other hand, fractures may cause casing deformation, inter-well frachit and other accidents. Therefore, identifying and evaluating the fractures near the well, especially the fractures intersected with the well bore, has guiding significance for formulating reasonable development and production planning for unconventional reservoirs (Cai et al, 2022a;Cai et al, 2022b;Qian et al, 2022). At present, the unconventional reservoir fracture logging evaluation method is difficult to meet the field demand, especially in highly deviated wells and horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

Forward modeling of P- and S-waves response of fractures intersected with horizontal wells in tight reservoirs

et al. 2023

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Horizontal wells play an important role in expanding the drilling volume of reservoirs and oil production area, and are widely used in unconventional reservoirs. Fractures have a positive effect on reservoir permeability, but fractures can also cause accidents such as casing deformation and inter-well frac-hit. It is of great significance to identify and evaluate fractures intersected with horizontal wells in tight reservoirs. In this paper, a three-dimensional numerical model of horizontal wells and fractures in tight reservoirs is designed. The responses of monopole P-wave and dipole S-wave to fractures with different width, dip angle and filling medium are systematically studied, by using three-dimensional finite difference algorithm. The results show that when the fracture is filled with calcite, the amplitude attenuation of monopole P-wave and dipole S-wave has a monotonic exponential increase with the increase of fracture width and the decrease of fracture dip angle. In the real data processing, the amplitude attenuation of P- and S-waves can be used to jointly evaluate the fracture filled with calcite. When the fracture is filled with water, both P- and S-waves have prominent amplitude attenuation. P wave amplitude attenuation does not have a monotonic variation with the increase of fracture width but it has a monotonic increase with the decrease of fracture dip angle. S wave amplitude attenuation has a monotonic increase with the increase of fracture width and the decrease of fracture dip angle. The amplitude attenuation of P- and S- waves rises significantly when the fracture is filled with natural gas. This study is crucial for better understanding the response of P- and S-waves to fractures intersected with borehole in tight reservoirs, and it provides useful information for the inversion of fracture parameters by using P- and S-waves.

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“…With the increasing demand for unconventional resources, shale oil exploration has become increasingly important . Shale reservoirs contain numerous micron-sized pores and nanosized pores. , Previous studies have shown that the interactions among fluids are dominant in some larger pores, while the fluid is obviously influenced by the surface in smaller pores, which cause great differences in the physical and chemical properties of shale oil and contributes to diverse occurrence states, , which in turn increases the difficulty of exploration and production . Thus, probing the relationship between the pore and surface is of great significance to identify sweet spots and enhance shale oil recovery.…”

Section: Introductionmentioning

confidence: 99%

A New Classification Method of Shale Reservoirs Based on the Relationship between Pore Volume and Surface Area: Shahejie Formation, Jiyang Depression, and Bohai Bay Basin

Liu,

Cai,

Liu

et al. 2023

Energy Fuels

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The differentiation of fluid occurrence can occur due to the coexistence of pores and surfaces, that is, the adsorbed and free states. However, on account of the unclear relation between the pore and surface, the evaluation and classification of shale are limited from the perspective of the reservoir. In this paper, a suite of shale samples were collected from the Shahejie Formation in the Jiyang Depression for nitrogen gas adsorption, high-pressure mercury intrusion, and field emission scanning electron microscopy. We analyzed the relationship between the pore volume (PV) and specific surface area (SSA), classified the shale reservoir based on the relationship, and discussed the characteristics and significances. In this study, the shale reservoir can be divided into the pore type, surface–pore type, and surface type according to the relationships between the PV and SSA. The pore type has the smallest SSA, the largest average pore size, more mesopores and macropores, and fewer micropores. The surface–pore type has a modest average pore size and SSA, more meso- and micropores, and fewer macropores. The surface type has the smallest average pore size, the largest SSA, more micropores, and fewer meso- and macropores. The fluid in the surface type is mainly the adsorbed state, while the fluid in the pore type is mainly in the free state, and the fluid in the surface–pore type is indicative of the coexistence of the adsorbed and free state.

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Microstructure Characterization Techniques for Shale Reservoirs: A Review

Cited by 13 publications

References 62 publications

Chemical sand production control: a review of materials, methods and characterization

Chemical sand production control: a review of materials, methods and characterization

Forward modeling of P- and S-waves response of fractures intersected with horizontal wells in tight reservoirs

A New Classification Method of Shale Reservoirs Based on the Relationship between Pore Volume and Surface Area: Shahejie Formation, Jiyang Depression, and Bohai Bay Basin

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