Abstract
Coalbed methane (CBM) resources are one of the most important and broadly developed unconventional resources. Considering the particularity of the coal, an adapted geomechanical method involving elastic-plastic deformation is badly needed to calculate the fracture parameters of the coal reservoir. Based on the rock mechanics experiments and three-dimensional μCT scan, the fracture evolution of coals can be summed up to initial compaction, propagation and coalescence stage. The microfractures will rapidly connect to each other when reaching 85% peak strength. Based on the plenty of measurement data, the relationship between fracture volume density and stress-strain of coals is established, and the acquisition of the quantitative geomechanical models made it possible to characterize fracture parameters after various tectonic movements under different stress state. Furtherly, the preparation of procedural language for the finite element (FE) simulation platform made it more popular and effective in the prediction of the generation of fractures and spatial distribution. The simulated results of No. 3 coal seam of Shizhuangbei area, both of the fracture density and direction, were in agreement with field observation results, which can be a compelling evidence for the effectiveness of the method.
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