Multiscale synchrotron microtomography imaging of kerogen lenses in organic-rich shales from the Norwegian Continental Shelf

Johnson, James R.; Kobchenko, Maya; Mondol, Nazmul Haque; Renard, François

doi:10.1016/j.coal.2022.103954

Cited by 4 publications

(13 citation statements)

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“…Despite similar bulk mineralogy, kerogen composition, and total burial depth [35,41,52], the two formations behave in a different manner elastically [93]. The zone in well 7125/1-1 acts markedly more brittle, utilizing more EBI than 16/8-3 S [92,93]. Geochemical markers and smectite-llite ratios reflect similar levels of maturation [52,92,93]; therefore, exhumation may account for this difference.…”

Section: Effect Of Exhumationmentioning

confidence: 97%

“…An in-depth comparison of kerogen lenses from well 16/8-3 S (i.e., SVG, North Sea) and well 7125/1-1 (i.e., SW Barents Sea) revealed that exhumation has no visible impact on the shape, size, orientation, or distribution of kerogen lenses before conversion [92]. Despite similar bulk mineralogy, kerogen composition, and total burial depth [35,41,52], the two formations behave in a different manner elastically [93].…”

Section: Effect Of Exhumationmentioning

confidence: 99%

“…Before conversion, kerogen lenses behave as brittle, matrix-supporting elements [89][90][91]. However, maturation results in the creation of internal porosity [58], followed by the extrusion of bitumen into the created pore-space (i.e., microfractures), controlled by lithostatic load [88,92].…”

Section: Effect Of Mineral Compositionmentioning

confidence: 99%

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Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

et al. 2022

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Characterizing the top seal integrity of organic-rich caprock shale is critical in hydrocarbon exploration and fluid storage sites assessment because the caprock acts as a barrier to the low-density upward migrating fluids. This study investigated the geomechanical properties of the Upper Jurassic caprock shales of various basins from the Norwegian Continental Shelf. Usually, paleo-deposition and diagenesis vary from basin to basin, which influences the geomechanical properties of caprock shale; hence, the seal integrity. Fourteen (14) wells from four (4) different basins within the Norwegian Continental Shelf were analyzed to evaluate the effects of various processes acting on caprock properties. Comparative mineralogy-based caprock properties were also investigated. We include a thorough review of the distribution of organic and inorganic components utilizing SEM and 3D microtomography as they relate to the development and propagation of microfractures. Five (5) wells from three (3) basins contain measured shear sonic logs. These wells were used for petrophysics and rock physics analysis. Three elastic properties-based brittleness indices were estimated and compared. The percentage of different mineral fractions of the studied wells varied significantly between the studied basins, which is also reflected in the mineralogical brittleness indices evaluation. Irrespective of the studied basins, relative changes in caprock properties between wells have been observed. The Young’s Modulus–Poisson’s ratio-based empirical equation underestimated the brittleness indices compared with mineralogy- and acoustic properties-based brittleness estimation. A better match has been observed between the mineralogy- and acoustic properties-based brittleness indices. However, as both methods have limitations, an integrated approach is recommended to evaluate the brittleness indices. Brittleness indices are a qualitative assessment of the top seal; hence, further investigation is required to quantify sealing integrity.

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Section: Effect Of Exhumationmentioning

confidence: 97%

Section: Effect Of Exhumationmentioning

confidence: 99%

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Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

et al. 2022

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“…Various imaging techniques such as scanning electron microscopy or multiscale synchrotron microtomography , revealed the complex pore networks, sponge-like internal structure, and large surface area of the shale kerogens. , Further, gas adsorption measurements such as low-pressure N 2 adsorption/desorption analysis and CO 2 adsorption associated with various thermodynamic models were employed to obtain the pore size distribution (PSD), specific surface area, and pore volume of kerogen structures. − Experiments also report ultralow shale permeability ranging from nanodarcy to a few microdarcy. , It is generally evident from experimental studies (see e.g. review articles ,− ) that the kerogen structures have a significant effect on the gas storage and gas transport mechanisms in the shale reservoirs.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Most of the shale gas and shale oil come from shale formations containing Type II kerogen. 6,7 Various imaging techniques such as scanning electron microscopy or multiscale synchrotron microtomography 18,19 revealed the complex pore networks, sponge-like internal structure, and large surface area of the shale kerogens. 20,21 Further, gas adsorption measurements such as low-pressure N 2 adsorption/desorption analysis and CO 2 adsorption 22 associated with various thermodynamic models were employed to obtain the pore size distribution (PSD), specific surface area, and pore volume of kerogen structures.…”

Section: Introductionmentioning

confidence: 99%

Adsorption, Diffusion, and Transport of C₁ to C₃ Alkanes and Carbon Dioxide in Dual-Porosity Kerogens: Insights from Molecular Simulations

2022

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Organic-shale formations are unconventional gas reservoirs with broad pore size distributions. Shale consists of two distinct components: organic matter and clay minerals. The size of pores in the organic matter is mostly concentrated at less than six nanometers, and these micropores and small mesopores provide the majority of adsorption surface area and gas storage volume. In these nanometer-sized pores, the geofluid behavior becomes significantly different from the bulk behavior due to the strong solid− fluid interactions and other confinement effects. Understanding the properties of fluids such as methane, ethane, propane, and carbon dioxide in narrow shale pores is critical for identifying ways to deploy shale gas technology with reduced environmental impact. Specifically, methane is a proxy of the shale gas, and ethane and propane are minor shale-gas components. Further, carbon dioxide is used for enhanced shale-gas recovery. We employ molecular-level simulations to explore adsorption, diffusion, and transport of methane, ethane, propane, and carbon dioxide in realistic models of organic-shale materials at a representative shalereservoir temperature and pressures. We first use Hybrid Reverse Monte Carlo with experimental pair distribution functions to build dual-porosity kerogen models corresponding to an immature marine kerogen from the Eagle Ford Play and a mature marine kerogen from the clay-rich Marcellus Play. We then employ Grand Canonical Monte Carlo simulations to study the fluid adsorption in the porous kerogen structures. We complete the adsorption studies by simulating the self-diffusivity, collective diffusivity, and transport diffusivity of the adsorbed fluid molecules in the shale kerogens using equilibrium and nonequilibrium molecular dynamics.

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Potential secondary seals within overburden: Observation from the CO2 storage sites Aurora and Smeaheia, northern North Sea

Rahman,

Fawad,

Mondol

2024

International Journal of Greenhouse Gas Control

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Multiscale synchrotron microtomography imaging of kerogen lenses in organic-rich shales from the Norwegian Continental Shelf

Cited by 4 publications

References 64 publications

Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

Adsorption, Diffusion, and Transport of C₁ to C₃ Alkanes and Carbon Dioxide in Dual-Porosity Kerogens: Insights from Molecular Simulations

Potential secondary seals within overburden: Observation from the CO2 storage sites Aurora and Smeaheia, northern North Sea

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Multiscale synchrotron microtomography imaging of kerogen lenses in organic-rich shales from the Norwegian Continental Shelf

Cited by 4 publications

References 64 publications

Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

Adsorption, Diffusion, and Transport of C1 to C3 Alkanes and Carbon Dioxide in Dual-Porosity Kerogens: Insights from Molecular Simulations

Potential secondary seals within overburden: Observation from the CO2 storage sites Aurora and Smeaheia, northern North Sea

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Adsorption, Diffusion, and Transport of C₁ to C₃ Alkanes and Carbon Dioxide in Dual-Porosity Kerogens: Insights from Molecular Simulations