Article
Energy & Fuels
James Ronald Johnson, Maya Kobchenko, Nazmul Haque Mondol, Francois Renard
Summary: This study investigates the shape and size distribution of kerogen lenses in shale rock samples using high-resolution multiscale synchrotron microtomography imaging, revealing the relationship between kerogen volume and the number of kerogen lenses in rock volume, as well as the relationship between total organic carbon content and average kerogen lens volume.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
Ahmed Al-Yaseri, Nurudeen Yekeen, Abubakar Isah, Safwat Abdel-Azeim, Abdulwahab Muhammad Bello, Sivabalan Sakthivel
Summary: Rock firing is a conventional technique used to prevent clay swelling and fines migration in clay-rich rock. However, the influence of rock firing on the wetting behaviors and alterations of mineralogical compositions in clay-rich sandstones is still unclear. This study assessed the impacts of rock burning at different temperatures on the wetting states and mineral compositions of Bentheimer (BN) and clay-rich Bandera Gray (BG) sandstones. The results showed that rock firing made the rocks more water-wet, with the BG sandstone becoming significantly more water-wet than the BN rock as the temperature increased. The study also revealed thermal transformations of clay to quartz and the disappearance of other minerals, leading to enhanced water wettability for the BG sandstone.
Article
Geochemistry & Geophysics
Xuan Qin, De-Hua Han, Luanxiao Zhao
Summary: "The grain bulk modulus is a crucial property of a rock frame, which can be explained by factors such as carbonate cement and clay. It has been found that using the bulk modulus of quartz directly can lead to errors. Therefore, the unjacketed test is the most reliable method for determining the grain bulk modulus of sandstones with different geological features."
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
James Ronald Johnson, Jorgen Andre Hansen, Md Jamilur Rahman, Francois Renard, Nazmul Haque Mondol
Summary: This study evaluates the interplay between kerogen maturation and total organic carbon content in organic-rich shale and its impact on the elastic behavior of source rock shale. The researchers analyzed a comprehensive database and introduced the Organic Maturation Product (OMP) rock physics template to classify rock maturation and link it to geomechanical properties. Seismic inversion and mapping reveal the influence of depositional environment and diagenetic events on the distribution and quality of source rock.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Kim Senger, Thomas Birchall, Peter Betlem, Kei Ogata, Sverre Ohm, Snorre Olaussen, Renate S. Paulsen
Summary: In this study, CSEM data and wireline logs resistivity responses were compared, showing a good match in shallow reservoirs. Careful interpretation and quantification of resistivity contributions from different formations, especially hydrocarbon-bearing sandstones and cap rocks, are crucial for exploration success.
GEOSCIENCE FRONTIERS
(2021)
Article
Chemistry, Physical
Benjamin Emmel, Bard Bjorkvik, Tore Lynga Froyen, Pierre Cerasi, Anna Stroisz
Summary: The underground hydrogen storage capacities of shut down oil and gas fields along the Norwegian continental shelf are evaluated based on available geological and hydrocarbon production data. Geochemical models suggest limited reactive mineral phases and meter-scale hydrogen diffusion into the caprock. For 23 shut down fields, a theoretical maximum UHS capacity of approximately 642 TWh is estimated. Frigg, Nordost Frigg, and Odin are identified as the best-suited shut down fields for UHS, with a maximum UHS capacity of approximately 414 TWh. Verification by site-specific dynamic reservoir models is needed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Geochemistry & Geophysics
Hanqing Yang, Xuezhen Wu, Hongwen Jing, Liyuan Yu, Richeng Liu
Summary: Temperature changes significantly affect the physical and mechanical properties of red sandstones and marbles, including porosity, peak strength, and shear strength. The range of 400 degrees C to 600 degrees C plays a crucial role in evaluating the variations in these properties after high-temperature exposure.
Article
Geosciences, Multidisciplinary
Fares Azzam, Thomas Blaise, Makfoula Dewla, Patricia Patrier, Daniel Beaufort, Ahmed Abd Elmola, Benjamin Brigaud, Eric Portier, Jocelyn Barbarand, Sylvain Clerc
Summary: The presence of grain-coating clays plays a crucial role in preserving the reservoir quality of deeply buried sandstones. These clays are of interest in hydrocarbon exploration as they facilitate the discovery of new oil and gas reserves. However, there is limited scientific literature documenting the origin and distribution of these clays in turbidites. This study investigates the mechanisms and parameters governing clay coat development in turbidite sandstones, focusing on the Agat Formation in the Norwegian North Sea. The findings highlight the importance of chlorite coats in maintaining the quality of deeply buried turbidite reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Xiaoshuang Li, Jun Peng, Yulin Xie, Qihang Li, Tao Zhou, Jiawen Wang, Wenbo Zheng
Summary: This paper studied the effect of high temperature on the mechanical properties of quartz-rich sandstone through true triaxial pressure experiments. It was found that the properties of the sandstone, including color, brittleness, and ductility, significantly changed when heated to 500 degrees Celsius. The density, P-wave velocity, and elastic modulus showed a decreasing trend, while the peak stress and peak strain exhibited an overall upward trend with the increase in temperature.
Article
Geosciences, Multidisciplinary
D. Ellerton, T. M. Rittenour, J. Shulmeister, A. P. Roberts, G. Miot da Silva, A. Gontz, P. A. Hesp, P. Moss, N. Patton, T. Santini, K. Welsh, X. Zhao
Summary: This study used optically stimulated luminescence and palaeomagnetic dating to determine the age of Fraser Island and the adjacent Cooloola Sand Mass. The results showed that they formed between 1.2 Ma and 0.7 Ma, during a global climate reconfiguration. The formation of Fraser Island reduced sediment supply and facilitated the development of the Great Barrier Reef.
Article
Geochemistry & Geophysics
Chaohui Lyu, Liguo Zhong, Zhengfu Ning, Qing Wang, David R. Cole
Summary: In this study, various experimental techniques were employed to interrogate the complex pore systems of tight gas reservoirs in the Linxing formation of Ordos Basin, China. Results showed that the permeability of tight gas sandstones is very low, with pore types and relative pore contents being more influential factors. Additionally, pore size distribution was found to be critical for the permeability, with pores averaging approximately 350 +/- X nm having sufficient connectivity to host and transmit hydrocarbons.
Article
Environmental Sciences
Hui Pan, Fuli Wu, Shuai Yin
Summary: A systematic fractal study was conducted on the tight oil reservoirs in the Chang 4+5 Member of Yanchang Formation in the central area of Ordos Basin based on high-pressure mercury intrusion experiments. The pore structures were found to exhibit single fractal and multisegment fractal characteristics, with larger pores having a more complex fractal dimension. The permeability calculation model based on fractal theory can provide high-precision quantitative characterization of reservoir permeability by considering parameters such as porosity, pore throat fractal dimension, and maximum pore throat radius.
FRESENIUS ENVIRONMENTAL BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Md Jamilur Rahman, James Ronald Johnson, Manzar Fawad, Nazmul Haque Mondol
Summary: Characterizing the top seal integrity of organic-rich caprock shale is critical in hydrocarbon exploration and fluid storage sites assessment. This study investigated the geomechanical properties of Upper Jurassic caprock shales from different basins on the Norwegian Continental Shelf. The study found that paleo-deposition and diagenesis influenced the geomechanical properties and seal integrity of the caprock shale. Additionally, the study compared mineralogy-based and acoustic properties-based brittleness indices and recommended an integrated approach for evaluating brittleness indices.
Article
Geochemistry & Geophysics
Supriya Sinha, Arthur Walmsley, Nigel Clegg, Brigido Vicuna, Hsu -Hsiang (Mark) Wu, Andrew McGill, Teo Paiva dos Reis, Marianne Therese Nygard, Gunn Ashild Ulfsnes, Monica Vik Constable, Frank Antonsen, Berit Ensted Danielsen
Summary: The introduction and improvements of UDAR technology have allowed real-time mapping and optimization of wellbore position, as well as enhanced well planning and reservoir model updates.
Article
Geochemistry & Geophysics
Ahmed A. Kassem
Summary: The complex depositional, burial, and diagenetic histories pose challenges to the reservoir quality of Late Cretaceous Nezzazat Group sandstones in Northeastern Africa. However, the quality of commercial reservoirs remains maintained despite deep burial, high temperature, and pressure. This study presents an optimal integration of different data sets to address reservoir quality and performance. Factors such as facies, grain size, porosity, and cementation control the reservoir quality. Compaction and secondary diagenetic processes affect porosity, while clay migration within the pore system is a potential source of formation damage.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2023)