页岩多尺度力学特性研究现状

Mechanical behaviors and engineering properties of shale reservoir are the key factors for the safe and efficient exploitation of shale oil and gas. At present, the study of physical and mechanical characteristics of shale is based primarily on macroscopic tests, with problems such as large sample volume, time-consuming experiments, and unsatisfactory research on target formation. Therefore, research status of shale multi-scale mechanical testing is illustrated from four aspects: shale multi-scale composition, micro/nano-mechanical testing technology, measurement influencing factors and cross-scale homogenization. The component model (nano-micro-macro) is established based on multi-scale analysis, which provides the theoretical basis for multi-scale composition-mechanical coupling of shale. The parameters of micro/nano-mechanical experiment are determined. The multi-scale measurement influencing factors are evaluated. Finally, multi-scale mechanical coupling model is studied. The relationship between composition and mechanics of multi-scale is developed. This technology plays an important role in understanding the mechanical characteristic and failure mechanism of shale, providing a new method for rock mechanics test.