A comprehensive review on shale studies with emphasis on nuclear magnetic resonance (NMR) technique

Yuan, Yujie; Rezaee, Reza; Zhou, Mei-Fu; Iglauer, Stefan

doi:10.1016/j.jgsce.2023.205163

Cited by 13 publications

(3 citation statements)

References 130 publications

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“…This indicates that brine is mainly entered in micropores and mesopores, and dodecane is mainly entered in mesopores and macropores with larger pore sizes. As the treatment pressure (CO 2 -brine immersion stage) increases, the imbibition spectra of brine and dodecane (SI stage) show a tendency to move upward on the right, which indicates the creation of new mesopores and macropores. , …”

Section: Results and Discussionmentioning

confidence: 97%

“…As the treatment pressure (CO 2 -brine immersion stage) increases, the imbibition spectra of brine and dodecane (SI stage) show a tendency to move upward on the right, which indicates the creation of new mesopores and macropores. 43,44 To understand the relationship between SI characteristics of shale and the treatment pressure (CO 2 -brine immersion stage) from the microscopic perspective, we processed the data from Figure 5 T 2 spectra using eq 6 and plotted the NMR imbibition amount (I w/o ) and the treatment pressure (CO 2 -brine immersion stage) curves for each pore, as shown in Figure 6. From Figure 6b−d, it can be seen that the NMR imbibition mount of brine and dodecane in mesopores, macropores, and all pores shows an increasing trend with the treatment pressure (CO 2 -brine immersion stage) on shale.…”

Section: Characterization Of Spontaneous Imbibition In Shalementioning

confidence: 99%

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Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Tang,

Wu,

Cheng

et al. 2024

Energy Fuels

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Spontaneous imbibition can impact the fluid distribution and saturation within the shale reservoirs, which, in turn, has an impact on the production and storage of shale oil and gas. The spontaneous imbibition characteristics of shale reservoirs under the CO 2 -brine-rock system will change. In order to understand the spontaneous imbibition characteristics of shale (before and after treatment with different pressures in CO 2 -brine), we researched the rock samples of shale from Chang 7 3 submember of Ordos Basin accordingly to conduct CO 2 -brine immersion treatment under different pressure tests, spontaneous imbibition tests (AFO), NMR T 2 tests, contact angle tests, and XRD tests. The results show that the final imbibition mass of/the initial imbibition rate of/the imbibition volume of brine and dodecane for the shale increase with the treatment pressure (CO 2 -brine immersion stage) increasing on the shale. It is the result of the combination of porosity, wettability, and mineral composition. Although the water wettability of the shale decreases and the relative content of water-wet (oil-wet) minerals decreases (increases), the porosity of the shale increases, so that the final imbibition mass of both brine and dodecane increases. Therefore, porosity has a greater influence on SI. CO 2 -water treatment at different pressures improves the spontaneous imbibition capacity of shale into water and oil, which will be beneficial to the flowback of fracturing fluid and the recovery of crude oil in the process of shale oil production.

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Section: Results and Discussionmentioning

confidence: 97%

Section: Characterization Of Spontaneous Imbibition In Shalementioning

confidence: 99%

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Tang,

Wu,

Cheng

et al. 2024

Energy Fuels

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show abstract

“…Unlike 1D-NMR only dealing with T 2 , T 1 – T 2 NMR (2D-NMR) is based on T 1 (longitudinal relaxation time) and T 2 and is prominent in fluid typing. 2D-NMR has been employed to distinguish kerogen, free oil and adsorbed oil, free water, adsorbed water, and structural water in oil-bearing shale. − Generally, kerogen corresponds to the highest T 1 / T 2 ratio; the T 1 / T 2 ratio of crude oil is higher than that of water. However, few works are using 2D-NMR to examine the performance of CO 2 -EOR for free and adsorbed oil recovery.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Adsorbed and Free Oil in Shale Formations by CO₂ Injection: An Experimental Study Using 1D- and 2D-NMR

Zou,

Hu,

Lun

et al. 2024

Energy Fuels

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Carbon dioxide (CO 2 ) injection has become particularly attractive for its effectiveness in shale oil recovery and additional potential for CO 2 sequestration. However, recovery mechanisms of shale oil in different occurrence states, such as adsorbed and free oil, are still unclear. In this study, we conducted CO 2 injection experiments on an oil-bearing shale sample collected from the Lucaogou Formation under several temperatures and injection pressures. The CO 2 injection experiment contained initial injection, soaking, and depressurization, which simulated one cycle of CO 2 huff-n-puff. The response of shale oil to CO 2 injection was captured by the combination of T 2 , T 1 −T 2 nuclear magnetic resonance (NMR) and mass balance analysis. Our results showed that free oil was easily recoverable by CO 2 injection. However, its recovery was not sensitive to the operating temperature since it increased slightly with elevated temperatures. As CO 2 injection pressure rose from 10 to 15 MPa under the operating temperature of 80 °C, the free oil recovery decreased by 6.7%. Adsorbed oil was only produced under a high temperature of 100 °C, and its content in shale increased by 9.9% when CO 2 was injected at 15 MPa. As residual water in the oil-bearing shale can be extracted by CO 2 , the shale oil recovery was overestimated by mass balance and T 2 NMR analysis. Our findings contribute to a better understanding of shale oil recovery by CO 2 injection.

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Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition

Yuan,

Wu,

Al-Khdheeawi

et al. 2024

International Journal of Coal Geology

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A comprehensive review on shale studies with emphasis on nuclear magnetic resonance (NMR) technique

Cited by 13 publications

References 130 publications

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Recovery of Adsorbed and Free Oil in Shale Formations by CO₂ Injection: An Experimental Study Using 1D- and 2D-NMR

Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition

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A comprehensive review on shale studies with emphasis on nuclear magnetic resonance (NMR) technique

Cited by 13 publications

References 130 publications

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO2 and Water

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO2 and Water

Recovery of Adsorbed and Free Oil in Shale Formations by CO2 Injection: An Experimental Study Using 1D- and 2D-NMR

Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition

Contact Info

Product

Resources

About

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Experimental Investigation on the Spontaneous Imbibition Characteristics of Shale under the Combined Action of CO₂ and Water

Recovery of Adsorbed and Free Oil in Shale Formations by CO₂ Injection: An Experimental Study Using 1D- and 2D-NMR