Effects of Rapid Thermal Exposure from Igneous Intrusions on the Pore Structure, Thermal Maturity, and Nanomechanical Properties of Coal and Shale

作者：M. Arshad Zahangir Chowdhury, Kripamoy Sarkar, Bodhisatwa Hazra, Farshad Sadeghpour, Mahima Panda, Vikram Vishal, Mehdi Ostadhassan · 发表于：Energy & Fuels · 年份：2025 · DOI：10.1021/acs.energyfuels.5c02068 · 被引用次数：5 · 研究领域：Coal Properties and Utilization、Hydrocarbon exploration and reservoir analysis、Rock Mechanics and Modeling

High Resolution Image Download MS PowerPoint Slide Rising energy demands and concerns about global warming have made coal and shale increasingly important not only as unconventional energy sources but also as potential storage sites for CO 2 sequestration. However, selecting these formations for either energy extraction or carbon storage requires comprehensive geological and petrophysical assessments. This is particularly important because, in some cases, localized thermal metamorphism from igneous intrusions can significantly alter their organic and structural properties, beyond natural thermal gradients, potentially making them unsuitable. Despite this, studies investigating the effects of igneous intrusions on the pore structure, geochemical attributes, and mechanical behavior at the micro- and nanoscale remain limited, especially in the Indian geological context. To address this gap, the present study offers the first integrated comparison of thermally altered and unaltered Indian coals and shales from the Raniganj Basin, with a focus on evaluating their suitability for CO 2 sequestration. A range of analytical techniques was applied, including Rock–Eval pyrolysis, petrography, X-ray diffraction (XRD), N 2 and CO 2 low-pressure gas adsorption, and nanoindentation, to assess the influence of igneous intrusion on the chemical, mineralogical, pore structural, and nanomechanical characteristics of both shale and coal. The results indicate a reduction in the hydrogen index, in...