Mechanical Properties and Micro-pore Fracture Structure Evolution Law of Niutitang Formation Shale under Different Heating Rates
Conducting research on the mechanical properties and microstructure evolution of shale under high temperature is of great significance for achieving efficient shale gas development.A study was conducted on the mechanical properties and Micro-pore fracture structure evolution of the Lower Paleozoic Niutitang Formation shale in the Micangshan area of China under different heating rates.The results show that at a low heating rate(2 degrees Celsius per minute),the tensile strength of shale significantly decreases.As the heating rate increases,the tensile strength first increases and then decreases;300 degrees Celsius is the threshold temperature for shale thermal reaction,and the porosity and permeability reach their maximum values near 450 degrees Celsius;A low heating rate is beneficial for the development of micropores,while a higher heating rate is beneficial for the development of large-scale cracks.
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