Gas Adsorption and Controlling Factors of Shale: Review, Application, Comparison and Challenges

Memon, Asadullah; Li, Aifen; Memon, Bilal Shams; Muther, Temoor; Han, Wencheng; Kashif, Muhammad; Tahir, Muhammad Usman; Alam, Imran

doi:10.1007/s11053-020-09738-9

Cited by 47 publications

(17 citation statements)

References 89 publications

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“…In addition, the methane absorption in kerogen is reported to contribute up to 22% of the total gas amount in shale. 110,111 However, the effect of gas absorption has been rarely taken into account to convert the measured excess adsorption into the absolute adsorption due to the difficulties in distinguishing absorption and adsorption which occur simultaneously during gas adsorption measurements. 112,113 While it is challenging for experiments to directly observe an adsorption mechanism under nanoscale, statistical thermodynamic approaches such as Monte Carlo (MC) simulation, molecular dynamics (MD) simulation, and density functional theory (DFT) enable researchers to take into account the characteristics of adsorbates as well as adsorbents and investigate gas adsorption mechanisms in shale from a microscopic perspective.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

2021

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Shale/tight gas plays an increasingly important role to meet the growing global energy demand and reduce carbon emissions. Unlike conventional reservoirs, shale formations are subject to rock heterogeneity and have pore size distributions ranging from sub-1 nm to a few micrometers. Thanks to the large number of nanosized pores, adsorbed methane capacity plays a dominant role in total shale gas-in-place. Methane adsorption behaviors can vary drastically in micropores and mesopores, and rock surface type may also greatly affect its adsorption. In this review, we provide a systematic discussion on measurements of shale rock properties including rock compositions and pore structures such as specific surface area (SSA) and pore size distribution (PSD), which are important parameters for methane adsorption in shale nanoporous media. We also provide in-depth discussions on experimental measurements on methane (excess) adsorption in shale nanoporous media, methane adsorption behavior characterization based on molecular simulations, and various excess-adsorption-to-absolute-adsorption conversion methods. We pay particular attention to the assumptions and working mechanisms proposed in various interpretation methods which are embedded in pore structures (SSA and PSD) and absolute adsorption characterizations. In the end, we summarize the key challenges in the methane adsorption characterization in shale media.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

2021

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“…where m and t represent the equilibrium constants that reflect the heterogeneity of the adsorbent. Indicators for evaluating the adsorption model have been studied in previous studies, 83,84 and there are three main indicators: (i) the fitting accuracy and error of the model; (ii) the physical meaning of the model itself and its parameters; and (iii) the predictive power of the model. Then, we evaluated those four models based on the above three indicators.…”

Section: Resultsmentioning

confidence: 99%

Study on the Adsorption and Thermodynamic Characteristics of Methane under High Temperature and Pressure

Gao

et al. 2020

Energy Fuels

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The understanding of the adsorption and thermodynamic characteristics of methane adsorbed by shale under high pressure and high temperature (HPHT) is of great significance for evaluating deep shale gas reserves and for optimizing shale gas development. In this study, a strict framework for analyzing the adsorption−thermodynamic characteristics of methane adsorption in shale under HPHT conditions was proposed. Further, data processing and explanation of the framework were carried out through reference to published experimental data. When real gas behavior and phase density changes were considered, the temperaturedependent parameters were corrected on the dual-site Langmiur model (DSL) model to reflect the absolute adsorption isotherm at each temperature. These were successfully calculated by combining those with the global fitting method. Compared with other adsorption models that reflected surface heterogeneity, the modified DSL model was found to well characterize the adsorption behavior of shale under HPHT conditions. The thermodynamic potentials of the methane adsorption process were further calculated from the results obtained from the modified DSL model. It was found that in the two groups of shale samples with different total organic carbon (TOC) contents, the change law of isosteric enthalpy with adsorption capacity was different. The abnormal entropy change behavior of methane adsorption in shale with higher TOC content was explained, and a new position concerning the long-standing controversy relating to entropy change was put forward. In addition, both the total entropy and internal energy during the methane adsorbed phase under HPHT increased with an increase in adsorption capacity, and the total entropy in the adsorbed phase revealed a positive relationship with temperature. By introducing a thermodynamic graphic method to draw a clearer and more intuitive U a −n a −S a three-dimensional surface, more thermodynamic potential information could be obtained. The framework proposed in this study could also be used to help future research on the influence of basic physical parameters on adsorption and thermodynamic properties and to provide a foundation for improving the evaluation of deep shale gas reserves.

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“…Along with this, the total organic carbon, stress, pore structure, and adsorption/desorption phenomena widely contribute to the storage and transport mechanism of shale formation (Memon et al 2020a). Besides, absorption is another important factor contributing to shale resource volume (Memon et al 2020b(Memon et al , 2020c. Due to such complex…”

Section: Geologic Features Of Shale Resourcesmentioning

confidence: 99%

“…The petrophysical characterization of CBM reservoirs consists of porosity, permeability, and reservoir quality index (RQI). The economical production of coalbed methane reservoirs depends on the four characteristics of a coal seam which are: permeability, coal seam thickness, gas pressure, and gas content (McKee et al 1988). The permeability of the coalbed is one of the important characteristics which are generated by natural fractures present in the coal.…”

Section: Petrophysical Characterization Of Coalbed Methanementioning

confidence: 99%

Unconventional hydrocarbon resources: geological statistics, petrophysical characterization, and field development strategies

Muther

Qureshi

Syed

et al. 2021

J Petrol Explor Prod Technol

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Hydrocarbons exist in abundant quantity beneath the earth's surface. These hydrocarbons are generally classified as conventional and unconventional hydrocarbons depending upon their nature, geology, and exploitation procedure. Since the conventional hydrocarbons are under the depletion phase, the unconventional hydrocarbons have been a major candidate for current and future hydrocarbon production. Additionally, investment and research have increased significantly for its exploitation. Having the shift toward unconventional hydrocarbons, this study reviews in depth the technical aspects of unconventional hydrocarbons. This review brings together all the important aspects of unconventional reservoirs in single literature. This review at first highlights the worldwide unconventional hydrocarbon resources, their technical concept, distribution, and future supplies. A portion of this study also discusses the resources of progressive unconventional hydrocarbon candidates. Apart from this, this review also highlights the geological aspects of different unconventional hydrocarbon resources including tight, shale, and coalbed methane. The petrophysical behavior of such assists including the response to well logs and the discussion of improved correlation for petrophysical analysis is a significant part of this detailed study. The variation in geology and petrophysics of unconventional resources with conventional resources are also presented. In addition, the latest technologies for producing unconventional hydrocarbons ranging from fractured wells to different fluid injections are discussed in this study. In the end, the latest machine learning and optimization techniques have been discussed that aids in the optimized field development planning of unconventional reservoirs.

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Gas Adsorption and Controlling Factors of Shale: Review, Application, Comparison and Challenges

Cited by 47 publications

References 89 publications

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

Study on the Adsorption and Thermodynamic Characteristics of Methane under High Temperature and Pressure

Unconventional hydrocarbon resources: geological statistics, petrophysical characterization, and field development strategies

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