Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Zhu, Yunxuan; Li, Zhiping; Lai, Fengpeng

doi:10.1021/acs.energyfuels.2c01130

Cited by 3 publications

(5 citation statements)

References 73 publications

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“…Our experimental samples are collected from the Fuling shale gas field in the eastern Sichuan basin in China, as shown in Figure . The Fuling shale gas field is the most commercially developed gas field in China due to its high thickness, OM content, strong gas-storage ability, and stable distribution.…”

Section: Experiments Methodsmentioning

confidence: 99%

Section: Experiments Methodsmentioning

confidence: 99%

“…Our experimental samples are collected from the Fuling shale gas field in the eastern Sichuan basin in China, as shown in Figure 2. 33 The Fuling shale gas field is the most commercially developed gas field in China due to its high thickness, OM content, strong gas-storage ability, and stable distribution. In this field, gas is mainly produced from the lower Silurian Longmaxi formation with a depth of more than 2000 m, which was deposited in an anoxic deep-water environment in a semiclosed margin.…”

Section: Experiments Methodsmentioning

confidence: 99%

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Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption

et al. 2022

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Knowledge of a shale pore structure is essential and critical to estimating gas storage and predicting gas production. Shale is a heterogeneous rock in terms of its composition and consists of organic matter (OM) and inorganic matter (IOM). Due to their difference in surface wettability and affinity to methane, the quantitative determination of apparent pore size distributions (APSDs) of OM and IOM as well as their contributions to the Barrett–Joyner–Halenda (BJH) pore volume is a very important task, but it is still a puzzling issue, especially considering the occurrence of water under the in situ condition. In this work, combining the water adsorption and low-pressure N2 adsorption–desorption experiments, we obtained the APSDs of dry and moist shale and clay samples, where the latter is assumed to the representative of IOM. Then, given the water distribution related to the surface wettability, a novel approach is proposed to quantitatively determine the APSDs of OM and IOM as well as their contributions to the BJH pore volume of shale under dry and in situ conditions. Our experimental results demonstrated that small nanopores (<5 nm) presented under a dry condition may be absent on the clay APSD curves under a moist condition due to the capillary condensation effect but are still shown on the shale APSD curves due to the existence of hydrophobic OM nanopores. Under a dry condition, the APSDs of OM and IOM for our samples show that OM is rich in small nanopores (i.e., 3–50 nm) while IOM pores show a wider range of size (i.e., 3–200 nm), and the contribution of OM-hosted volume to BJH pore volume is 26.7% and 20%. While under a moist condition (RH = 98%), IOM pore volumes of 26% and 20% are occupied by water molecules, and the OM-hosted proportion increases to 36% and 26%, respectively. This study proposed a significant approach to deeply characterize shale pore structure, which provides a more solid and reliable foundation for the shale gas storage estimation and well performance prediction.

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Section: Experiments Methodsmentioning

confidence: 99%

Section: Experiments Methodsmentioning

confidence: 99%

Section: Experiments Methodsmentioning

confidence: 99%

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Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption

et al. 2022

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“…The process of imbibition is mainly affected by nanopores. 19,20 Typically, spontaneous imbibition volume and fluid flow behavior can be acquired with multiple techniques, including the section method and the water-sensitive indicator method, low-field nuclear magnetic resonance (NMR), neutron imaging technology, scanning electron microscopy, and numerical simulation. 21−26 NMR analysis provides a significant advantage in the study of pore size distribution, porosity, and pore connectivity, such as practical simplicity, sensitivity, rapidity, nondestructive detection, and wide characterization range.…”

Section: Introductionmentioning

confidence: 99%

“…Different types of pores have different effects on imbibition recovery. The process of imbibition is mainly affected by nanopores. , …”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Spontaneous Imbibition of Coal Samples of Different Ranks Based on the NMR Relaxation Spectrum

Wang,

Du,

et al. 2023

ACS Omega

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The comprehension of the mechanisms governing spontaneous water imbibition in gas–water systems plays a significant role in the operation of hydraulic fracturing and the development of coalbed methane (CBM). In this study, nuclear magnetic resonance (NMR) techniques were used to investigate the pore structure and fluid behavior of different rank coal samples during spontaneous imbibition. Analyses were conducted on the 1D NMR T 2 spectrum, 2D NMR T 1–T 2 spectrum, and layer division T 2 spectra to achieve accurate and detailed information about the internal pore structure of coal and the characteristics of fluid transport during spontaneous imbibition. Low-rank coal exhibits good pore connectivity and favorable pore sorting characteristics, indicating favorable reservoir conditions. High-rank coal has larger pore spaces and highly developed micropores, which are highly beneficial for gas adsorption. However, its poor pore sorting characteristics and connectivity limit the migration and diffusion of fluids within the reservoir. The imbibition capacity follows a specific order of contribution, with small pores (10–50 nm) having the most significant role, followed by micropores (2–10 nm), ultramicropores (r < 2 nm), mesopores (50–1000 nm), macropores (1000–10,000 nm), and microfractures (r ≥ 10,000 nm). Low-rank coal stands out due to the restricted development of ultramicropores and small pores, leading to a different contribution of imbibition capacity compared to other samples, where macropores and microfractures dominate over all pore types. The coal reservoirs with favorable pore sorting characteristics and pore connectivity tend to exhibit a tendency toward rapid saturation and attainment of a prompt stable state during the hydraulic fracturing process. Finally, the mechanism of the late retreat effect of imbibition and the laws governing different coal ranks, pore structures, and fluid transport were discussed. This study offers comprehensive analyses of the mechanism of coal spontaneous imbibition and the characteristic laws of fluid seepage, providing insights into the optimization of CBM recovery and reservoir management.

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Effect of Microstructure on Changes to the Pore Structure and Mechanical Properties of Limestone under Acidic Groundwater Corrosion

Liu,

Wang,

Liu

et al. 2023

Int. J. Geomech.

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Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Cited by 3 publications

References 73 publications

Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption

Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption

Experimental Study on Spontaneous Imbibition of Coal Samples of Different Ranks Based on the NMR Relaxation Spectrum

Effect of Microstructure on Changes to the Pore Structure and Mechanical Properties of Limestone under Acidic Groundwater Corrosion

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Effects of Microscopic Pore Structures on the Spontaneous Imbibition of Longmaxi Shale

Cited by 3 publications

References 73 publications

Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N2 Adsorption

Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N2 Adsorption

Experimental Study on Spontaneous Imbibition of Coal Samples of Different Ranks Based on the NMR Relaxation Spectrum

Effect of Microstructure on Changes to the Pore Structure and Mechanical Properties of Limestone under Acidic Groundwater Corrosion

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Product

Resources

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Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption

Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N₂ Adsorption