Applying classical shale gas evaluation concepts to Germany—Part II: Carboniferous in Northeast Germany

Hartwig, Alexander; Könitzer, Sven F.; Boucsein, Bettina; Horsfield, Brian; Schulz, Hans-Martin

doi:10.1016/j.chemer.2010.05.013

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…As a clean and efficient unconventional energy source, the exploration and development of shale gas are receiving increasingly more attention because of its considerable reserves and wide distribution. − Due to the complex mineralogical compositions in shales, the wettability of shales in different regions is very complicated. Clay minerals in shales, for instance, montmorillonite, illite, kaolinite, and chlorite, and nonclay minerals in shales, for instance, quartz, calcite, dolomite, and feldspar, are usually hydrophilic, − while the organic matter in shales is usually lipophilic.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

et al. 2022

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The wettability behaviors of nanoscale pores in shales from Longmaxi Formation in the Sichuan Basin of South China, which contain quartz pores, illite pores, and organic matter pores, were investigated using the molecular dynamics simulation and experimental methods, and the organic matter surface was approximated by grafting oxygenated functional groups onto a graphite surface. The distribution characteristics of a water–methane system in organic matter pores were studied. The results indicate that the organic matter pore network and the inorganic pore network in shales show cross-distribution characteristics. The speed of spontaneous imbibition of oil is less than that of water, and the spontaneous imbibition mass of oil increases with increasing the total organic carbon (TOC) contents. The surfaces of illite and quartz mineral are hydrophilic. With the increase in oxygen-containing functional groups, the interaction energy between the organic matter surface and water molecules decreases, resulting in an increase in the wetting contact angle of the organic matter surface. With increasing temperature, the interaction energy between the organic matter surface and water molecules increases, resulting in a decrease in the wetting contact angle. In symmetrical graphite pore models with different C/O ratios, water molecules are symmetrically spread near the oxygen-functionalized graphite wall, and with a decrease in the C/O ratio, the relative concentration of water molecules increases and the diffusion coefficient decreases. In contrast, methane molecules are gathered and distributed in the center of the pore. In an asymmetric graphite pore model with different C/O ratios, water molecules are asymmetrically spread near the oxygen-functionalized graphite wall, whereas methane molecules are concentrated and spread in the pore center. The side with a lower C/O ratio has stronger hydrophilicity and a higher relative concentration of water molecules, whereas the side with a higher C/O ratio has stronger hydrophobicity and a lower relative concentration of water molecules.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

et al. 2022

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“…The generated gas is stored as free gas in 120 either intergranular porosity and fractures in shales, nanoporosity in kerogens that developedM A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 6 during maturation, adsorbed onto the kerogen and clay particle surfaces, or absorbed in either 122 kerogen or bitumen (Bernard et Scotchman, 2015). 124 125 Unconventional shale gas resource systems are generally slightly to highly over-126 pressured (Jarvie, 2012), and the few published studies so far have used either open system 127 pyrolysis (Rock Eval and pyrolysis gas chromatography), or low pressure MSSV closed 128 system pyrolysis, to investigate gas generation and retention in shale gas resource systems 129 (Hartwig et al 2010;Mahlstedt and Horsfield, 2012;Slowakiewicz et al 2015). The 130 retention of gas in shales depends partly on the adsorption of the generated gas by the kerogen 131 and inorganic minerals (Williams, 2013).…”

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confidence: 99%

Impact of high water pressure on oil generation and maturation in Kimmeridge Clay and Monterey source rocks: Implications for petroleum retention and gas generation in shale gas systems

Uguna

Carr²,

Snape

et al. 2016

Marine and Petroleum Geology

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“…Shale gas has been emerging as a new potential energy resource in the world, especially in North America . The shale gas reservoirs generally exhibit some unique characteristics, which are quite different from those of the conventional reservoirs, such as extremely tight features, heterogeneity, etc. , The development of shale gas reservoirs thereby differs from that of the conventional ones in that it highly depends on the overall estimation of the geological, geochemical, or petrochemical properties of the shale gas reservoirs .…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Potential Relationships between Geophysical Properties and CH₄ Adsorption in a Typical Shale Gas Reservoir

Liu

Hou

2019

Energy Fuels

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The Longmaxi Formation is considered to be a potential shale gas reservoir in Sichuan Basin of China. In this work, 28 typical shale core samples are collected from the Longmaxi Formation and a comprehensive characterization of the geophysical and petrochemical properties of these core samples is obtained. Thermogravimetric method is applied to measure the excess CH 4 adsorption on these shale samples; the adsorbed CH 4 density is then calculated using the grand canonical Monte Carlo simulation method, which is consequently used to determine the absolute CH 4 adsorption. Based on the converted absolute adsorption, the Langmuir adsorption model is employed to determine the maximum adsorption capacity of CH 4 on these shale samples. The inter-relationships between the adsorption capacity of CH 4 and the geophysical properties of the 28 Longmaxi shale cores are analyzed. The geophysical and petrochemical characterization results show that the Longmaxi Formation generally possesses pores with diameter in the range of 1−10 000 nm, while mesopores (i.e., 2−50 nm) account for the most proportion. The Longmaxi shale has a complex mineral composition, wherein clay minerals constitute more than half of the total minerals. The maximum adsorption capacity of CH 4 on these typical shale increases as the burial depth increases, indicating a higher potential for the commercial development of the Longmaxi shale with deep formations; in addition, the maximum adsorption capacity has a positive and linear relationship with the total organic carbon content. The CH 4 adsorption presents linear and positive inter-relationships with clay minerals, i.e., illite and montmorillonite, other than kaolinite.

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Applying classical shale gas evaluation concepts to Germany—Part II: Carboniferous in Northeast Germany

Cited by 12 publications

References 20 publications

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

Impact of high water pressure on oil generation and maturation in Kimmeridge Clay and Monterey source rocks: Implications for petroleum retention and gas generation in shale gas systems

Investigation on the Potential Relationships between Geophysical Properties and CH₄ Adsorption in a Typical Shale Gas Reservoir

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Applying classical shale gas evaluation concepts to Germany—Part II: Carboniferous in Northeast Germany

Cited by 12 publications

References 20 publications

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

Molecular Dynamics Simulation and Experimental Studies of the Wettability Behaviors of Shales

Impact of high water pressure on oil generation and maturation in Kimmeridge Clay and Monterey source rocks: Implications for petroleum retention and gas generation in shale gas systems

Investigation on the Potential Relationships between Geophysical Properties and CH4 Adsorption in a Typical Shale Gas Reservoir

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Investigation on the Potential Relationships between Geophysical Properties and CH₄ Adsorption in a Typical Shale Gas Reservoir