Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Han, Wencheng; Li, Aifen; Memon, Asadullah; Ma, Min

doi:10.1021/acsomega.0c05490

Cited by 22 publications

(20 citation statements)

References 107 publications

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“…The impact of preadsorbed water was more significant than that of water vapor. Several studies have shown that adsorbed water has a detrimental effect on supercritical methane adsorption on shales; 96,97 for example, methane sorption capacity in moisture-equilibrated shales [at 97% relative humidity (RH)] was reduced by 40−60% compared to dry samples. 12 The early work on the effect of water adsorption on methane adsorption on kerogens was based on studies of coal.…”

Section: Comparison Of Supercritical Adsorption Isobars For Kerogens ...mentioning

confidence: 99%

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Thomas

2023

Energy Fuels

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Shale gas from unconventional resources will contribute to meeting the energy demand during the transition to a net-zero carbon economy. In this minireview, the current status of understanding methane adsorption on kerogens and shales is discussed in relation to methane storage capacity. Standard subcritical adsorption studies provide characterization data (micropore volumes, total pore volumes, surface areas, and pore size distributions) for the porous structures of shales and kerogens. However, supercritical methane adsorption measurements under simulated geological conditions are necessary to assess realistic methane adsorption storage capacities. Supercritical methane adsorption on shale and shale components (kerogens and clays) under high pressure and temperature conditions that simulated geological conditions is compared. Kerogen structural characteristics are discussed in relation to supercritical methane isotherms and isobars. The contribution of adsorbed methane gas relative to “free” or compressed gas to the total gas stored in shale is considered. The importance of kerogens in both storage of the adsorbed phase and as the source of methane is highlighted, and the areas where knowledge and understanding are deficient are identified, in particular, the relationship of kerogen type and maturity with supercritical methane adsorption under simulated geological conditions. The competitive adsorption of water on methane capacity is also an area where more detailed studies are necessary. These are challenges to address gaps in the current knowledge and understanding, which require future research.

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Section: Comparison Of Supercritical Adsorption Isobars For Kerogens ...mentioning

confidence: 99%

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Thomas

2023

Energy Fuels

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“…Gasparik et al. , found that the methane adsorption capacity of wet shale was approximately 40–90% lower than that of dry shale. Han et al experimentally found that the higher the water content of shale, the lower its methane adsorption capacity. Some scholars studied the water vapor adsorption law by water vapor adsorption experiments under different temperature and pressure conditions, and established adsorption models. − Previous experiments on water vapor adsorption have emphasized the influence of water vapor on shale gas adsorption and fluid flow capacity. − However, it is controversial whether water is gaseous under formation conditions, and some studies have shown that the water phase is liquid under high-temperature and high-pressure conditions at certain burial depths .…”

Section: Introductionmentioning

confidence: 99%

“…Gasparik et al 19,20 found that the methane adsorption capacity of wet shale was approximately 40−90% lower than that of dry shale. Han et al 21 experimentally found that the higher the water content of shale, the lower its methane adsorption capacity. Some scholars studied the water vapor adsorption law by water vapor adsorption experiments under different temperature and pressure conditions, and established adsorption models.…”

Section: Introductionmentioning

confidence: 99%

Occurrence Characteristics of Water in Nano-Slit Pores under Different Solution Conditions: A Case Study on Kaolinite

Zhou

Song

et al. 2023

ACS Omega

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The presence of water in narrow pore spaces affects the occurrence and flow of methane, which in turn affects shale gas production. Therefore, studying the occurrence and distribution characteristics of water is of great significance to predict gas production. Based on molecular dynamics simulations, this study investigated the occurrence characteristics and influencing variables of liquid water in kaolinite nanopores in situ. Owing to its widespread distribution, kaolinite is the most prevalent clay mineral with two surfaces with different characteristics. Three systems of pure water, a CaCl 2 solution, and a H 2 O/CH 4 mixed phase were created at varied temperatures (80−120 °C) and pressures (70−120 MPa). The presence of gas and water in the nanopores was investigated thoroughly. The results showed that the adsorption of water on the Al−O octahedral surface of kaolinite was not affected by external conditions under in situ conditions, whereas the adsorption of water on the Si−O tetrahedral surface decreased with increasing temperature, but the change was small. When ions were present in the system, the water capacity decreased. Based on the aforementioned results, external conditions, such as temperature and pressure do not affect the basic state of water. However, if there are more than two fluid types in the system, the adsorption of water on the mineral surface is reduced owing to competitive adsorption. In addition, a CH 4 −H 2 O mixed system was simulated, in which methane molecules were distributed in clusters. There are two types of adsorptions in pores: gas−solid interactions and solid−liquid−gas interactions. CH 4 molecules are thought to be clustered in water molecules because of the strong hydrogen bonding interactions among the water.

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“…Gas is stored in shale mainly as adsorbed gas in the organic matter and clay minerals and as free gas in the fractures and other pores. , Therefore, understanding the characterization and evaluation of adsorbed gas and free gas is greatly significant in shale gas reservoir evaluations and estimating the original gas in place. In this study, the variation in the relationship between the adsorption of methane and the free gas in shale under different pressure conditions is illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Quantitative Studies on the Characterization and Evaluation of Adsorbed Gas and Free Gas in Deep Shale Reservoirs

Shen

Zuo

et al. 2023

Energy Fuels

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The quantitative characterization of adsorbed gas and free gas in shale reservoirs is a key issue in exploration and development of shale gas. Thus, the aforementioned topic is of great significance to the evaluation of reserves, the screening of favorable target areas, and the formulation of development plans. However, research on our current understanding of the quantities of adsorbed gas and free gas in deep shale gas reservoirs is still lacking. To address this problem, deep shales from the Longmaxi Formation in southern China were collected to conduct high-pressure isothermal adsorption experiments. The high-pressure isothermal adsorption model was used to describe the adsorption behavior of methane in deep shales, and the adsorbed gas and free gas in the deep shales were characterized quantitatively. The effects of temperature, pressure, and moisture on the adsorbed gas and the density of the free gas were analyzed. The results indicated that the excess adsorption isotherm curve for methane in deep shales increased and then decreased with the increase of pressure, and the modified Langmuir adsorption model may be used to describe the high-pressure adsorption behaviors. The adsorbed gas in shales decreases gradually with the increase of pressure, and the proportion of adsorbed gas and free gas is between 23 and 74% when the pressure reaches 50 MPa. The adsorbed gas in deep shales decreases with an increase of temperature, and the presence of water greatly reduces the adsorption capacity of the deep shale. The pore space occupied by the free gas in shale increased with the increase in the density of the free phase, and the ratio of the adsorbed gas to the free gas decreased. This research provides a useful reference for explaining how to best evaluate shale gas reservoirs, estimate the reserves in deep shales, and evaluate the adsorption and flow capacity of deep shale gas.

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Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Cited by 22 publications

References 107 publications

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Occurrence Characteristics of Water in Nano-Slit Pores under Different Solution Conditions: A Case Study on Kaolinite

Quantitative Studies on the Characterization and Evaluation of Adsorbed Gas and Free Gas in Deep Shale Reservoirs

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