Organic matter is an important constituent in organic‐rich shale, which influences the hydrocarbon generation, as well as the mechanical behavior, of shale reservoirs. The physical, chemical, and mechanical properties of organic matter depend on the source material and the thermal evolution process. Previous works attempted to investigate the impact of thermal maturation on the mechanical properties of organic matter. However, owing to the lack of maceral classification and the limitation of data volume during the mechanical measurement, no consistent trend has been identified. In this work, vitrinite reflectance test, scanning electron microscope observation, nanoindentation, and micro‐Raman analysis were combined for geochemical and mechanical characterization. A total of 114 test areas were selected for testing, enhancing reliability of the test results. The Young's moduli of organic matter are from 3.57 to 8.32 GPa. With the same thermal maturity, inertinite has the highest Young's modulus, while the modulus of bitumen is the lowest. The Young's moduli of different organic types all increase with vitrinite reflectance. When vitrinite reflectance increases from 0.62% to 1.13%, the modulus of inertinite and vitrinite is increased by 57% and 78%, respectively. The indentation creep of different organic matter suggests that the stiffer organic type demonstrates less creep influence. In addition, with the increase of thermal maturity, the micro‐Raman test results show a decrease of intensity ratio of D peak to G peak, indicating an increase of the ordered structure in organic matter. From the characterization results, it was found that organic type and thermal maturity reflect the diversity of the source material and the chemical structure change during the thermal evolution process, and together they influence the mechanical properties of organic matter.

中文翻译：

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地球化学特征对页岩有机质力学性质的影响

有机质是富含有机物的页岩的重要组成部分，它影响页岩储层的碳氢化合物生成以及力学行为。有机物的物理，化学和机械性能取决于原料和热演化过程。以前的工作试图研究热成熟对有机物机械性能的影响。然而，由于缺乏宏观分类和机械测量过程中数据量的限制，没有发现一致的趋势。在这项工作中，结合了镜质体反射率测试，扫描电子显微镜观察，纳米压痕和显微拉曼分析，以进行地球化学和力学表征。总共选择了114个测试区域进行测试，增强测试结果的可靠性。有机物的杨氏模量为3.57至8.32 GPa。在相同的热成熟度下，惰质的杨氏模量最高，而沥青的模量最低。不同有机物类型的杨氏模量均随镜质体反射率的增加而增加。当镜质体反射率从0.62％增加到1.13％时，惰质和镜质体的模量分别增加57％和78％。不同有机质的压痕蠕变表明，较硬的有机物类型对蠕变的影响较小。此外，随着热成熟度的提高，微拉曼试验结果表明D峰与G峰的强度比降低，表明有机物中有序结构的增加。根据表征结果，