Surface Properties of Organic Kerogen in Continental and Marine Shale

Tian, Shouceng; Dong, Xiaoxiao; Wang, Tianyu; Zhang, Rui; Zhang, Panpan; Sheng, Mao; Cheng, Shizhong; Hong, Zhonghua; Ling, Fei; Street, Jason; Chen, Yu‐Sheng; Xu, Quan

doi:10.1021/acs.langmuir.8b03151

Cited by 28 publications

(24 citation statements)

References 39 publications

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“…The adhesion forces of illite remain almost constant when the retraction velocity increases from 500 to 3000 nm/s. Compared to kerogen, the effect of retraction velocity on illite’s adhesion forces is not obvious, as estimated in our prior work . Moreover, we also measured the adhesion force of montmorillonite, calcite, and muscovite at a preloading force of 2500 nN and retraction velocity of 2500 nm/s.…”

Section: Resultsmentioning

confidence: 72%

Nanoscale Surface Properties of Organic Matter and Clay Minerals in Shale

Tian

Wang

et al. 2019

Langmuir

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Surface properties of shale play an essential role in adsorption, transport, and production of hydrocarbons from shale reservoirs. Nanoscale surface properties of kerogen and minerals of shale were examined by a series of techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIRS), and atomic force microscopy (AFM). The results show that aluminosilicate is the main component of inorganic matter, while kerogen chiefly consists of carbon. FTIRS and XPS analysis indicate that the chemical bonds of the kerogen surface are O−H, C− C, C−O, pyrrolic, and so on. In contrast to kerogen, illite's bonds are mainly Si−O and Al−O. AFM results indicate that the adhesion force of kerogen is higher than that of illite in shale. In addition, at a preloading force of 2500 nN, the adhesion force of kerogen increases from 40.8 to 118.2 nN when retraction velocity increases from 500 to 2500 nm/s. The adhesion forces of montmorillonite, calcite, and muscovite are 33.7 ± 6.28, 23.8 ± 11.8, and 105.1 ± 9.1 nN, respectively. The chemical composition and bonds have a profound effect on the adhesion force of shale, which further reveals the transport and adsorption mechanism of methane in kerogen.

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Section: Resultsmentioning

confidence: 72%

Nanoscale Surface Properties of Organic Matter and Clay Minerals in Shale

Tian

Wang

et al. 2019

Langmuir

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“…Small-angle neutron scattering and ultrasmall-angle neutron scattering techniques have been applied for understanding the porosity characteristics of the shale samples (Clarkson et al 2013;Mastalerz et al 2012a). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) are also used to characterize the pores in the sample (Javadpour et al 2012;Tian et al 2018;Tian et al 2019). Although they can directly reveal the locations of the pores, the connectivity of the pores cannot be revealed by SEM and AFM.…”

Section: Edited By Yan-hua Sunmentioning

confidence: 99%

Pore structure characterization and its effect on methane adsorption in shale kerogen

et al. 2020

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Pore structure characterization and its effect on methane adsorption on shale kerogen are crucial to understanding the fundamental mechanisms of gas storage, transport, and reserves evaluation. In this study, we use 3D scanning confocal microscopy, scanning electron microscopy (SEM), X-ray nano-computed tomography (nano-CT), and low-pressure N2 adsorption analysis to analyze the pore structures of the shale. Additionally, the adsorption behavior of methane on shales with different pore structures is investigated by molecular simulations. The results show that the SEM image of the shale sample obviously displays four different pore shapes, including slit pore, square pore, triangle pore, and circle pore. The average coordination number is 4.21 and the distribution of coordination numbers demonstrates that pores in the shale have high connectivity. Compared with the adsorption capacity of methane on triangle pores, the adsorption capacity on slit pore, square pore, and circle pore are reduced by 9.86%, 8.55%, and 6.12%, respectively. With increasing pressure, these acute wedges fill in a manner different from the right or obtuse angles in the other pores. This study offers a quantitative understanding of the effect of pore structure on methane adsorption in the shale and provides better insight into the evaluation of gas storage in geologic shale reservoirs.

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“…Interactive forces between surfaces are the signature of surface materials (Javadpour et al 2012). Previous studies had been illustrated using distinct force interactions to study and characterize shale samples (Tian et al 2018). In this experiment, we randomly selected six positions on the sample surface and concentrated on adhesion force changes before and after dilute acid treatment.…”

Section: Effect Of Dilute Acid Treatment On Adhesion Forcesmentioning

confidence: 99%

“…For shale gas, the adsorption status is mainly controlled by the van der Waals forces (Wang et al 2016;Wu et al 2015) and shale gas in absorbed phase can reach 85% of the total gas-in-place (Curtis 2002). AFM, with its high vertical resolution, can detect the tip/sample interaction force (adhesion force) (Tian et al 2018), and it is crucial for understanding the flow behavior of oil and gas at nanoscale. Up to now, little research has been conducted on adhesion properties of shale before and after acid treatment and there has not been a unified understanding of acid treatment in shale formations.…”

Section: Introductionmentioning

confidence: 99%

Effect of dilute acid treatment on adhesion properties of Longmaxi black shale

et al. 2019

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Properties of shale in an acid environment are important when acid or CO 2 is injected into geologic formations as a working fluid for enhanced oil and gas recovery, hydraulic fracturing and reduced fracture initiation pressure. It has previously been shown that acid fluids can enhance the formation conductivity and decrease the hardness of shale. However, less is known about the effect of dilute acid on the adhesion properties of shale. In the study, shale samples are characterized in detail with advanced analysis. Adhesion properties of shale via dilute acid treatment were revealed by atomic force microscopy (AFM) for the first time. Results indicate that acid treatment can greatly enhance adhesion forces of the shale surface. After acid treatment, the average adhesion forces show a platform-like growth with an increase in loading force. Through analysis of results from AFM, scanning electron microscopy, and X-ray diffraction, we affirm that the enhanced adhesion forces are mainly from increased specific surface area and reduced elastic modulus. The results presented in this work help understand the adhesion properties of shale oil/gas present in an acidic environment, which have great significance in unconventional resources development.

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Surface Properties of Organic Kerogen in Continental and Marine Shale

Cited by 28 publications

References 39 publications

Nanoscale Surface Properties of Organic Matter and Clay Minerals in Shale

Nanoscale Surface Properties of Organic Matter and Clay Minerals in Shale

Pore structure characterization and its effect on methane adsorption in shale kerogen

Effect of dilute acid treatment on adhesion properties of Longmaxi black shale

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