Tomography with sparseness regularisation for ultrasonic velocity imaging

Abstract Ultrasonic tomography, which is widely used in the study of fracturing process rocks, often exhibits low resolution due to insufficient ray coverage, particularly while evaluating three-dimensional (3D) fractures. To resolve this issue, we adopted sparseness regularisation tomography reconstruct ultrasonic velocity rocks. Both numerical and laboratory experiments demonstrate that with generates images clear fracture morphology than Tikhonov regularisation. Dynamic monitoring a granite slab two-dimensional (2D) can reveal accurate development process. The experiment on internal structure tight sandstone after hydraulic reveals demarcated low-velocity regions 3D These correspond positions fractures when compared X-ray scanning images. Thus, improve images, be accurately describe strain localisation during rock deformation.