Effect of thermal maturation on chemical structure and nanomechanical properties of solid bitumen
发布时间：2024-01-08
元数据
名 称
Effect of thermal maturation on chemical structure and nanomechanical properties of solid bitumen
科技资源标识
CSTR:11738.14.NCDC.XDA14.PP4360.2024
DOI
10.1016/j.marpetgeo.2017.12.008
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摘 要
An abundance of organic matter is present as solid bitumen in highly mature shales. Changes in chemicalstructure of solid bitumen during catagenesis could alter the way its mechanical properties evolve. This studyconsiders a series of solid bitumen samples artificially produced from the pyrolysis at 420–618 °C of solubleorganic matter which originated from Maoming shale, to examine alternations in their chemical structure, nano-morphological and mechanical properties during maturation. Solid-state 13C nuclear magnetic resonance spec-troscopy and elemental analysis were employed to characterize the structural changes. Young's modulus and microstructures were determined by atomic force microscopy. The results show that both structural (includingC/H atomic ratio and carbon aromaticity) and mechanical (Young's modulus) variations in solid bitumen exhibittwo staged evolutions (i.e., wet gas stage and dry gas stage) during maturation. In the wet gas stage (EasyRo1.85%–2.64%), the C/H ratio and carbon aromaticity increase substantially with maturation, and the solidbitumen is relatively compliant with an average Young's modulus varying from 2.7 ± 0.6 to 3.0 ± 0.6 GPa.When maturity reaches to dry gas stage (EasyRo 2.64%–4.59%), structural parameters do not change greatly,whereas solid bitumen becomes much stiffer with modulus rising sharply to 7.2 ± 1.1 GPa at EasyRo 3.49% andfurther gently to 8.8 ± 1.4 GPa at EasyRo 4.59%. Concomitantly, great variations are observed on surfacemorphology, and the degree of heterogeneity in solid bitumen is recorded to be increasingly high along thermalsimulation. Given the strong correlation between structural parameters and Young's modulus, we suggest thatthe stiffening of solid bitumen is extensively affected by its structural condensation due to the loss of aliphaticcarbons and the increase of aromaticity.
Liu Yuke. Effect of thermal maturation on chemical structure and nanomechanical properties of solid bitumen. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP4360.2024.
Liu Yuke. Effect of thermal maturation on chemical structure and nanomechanical properties of solid bitumen. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://www.doi.org/10.1016/j.marpetgeo.2017.12.008.
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CSTR:11738.14.NCDC.XDA14.PP4360.2024
10.1016/j.marpetgeo.2017.12.008