Study on a New Rock Fracability Evaluation Model of Shale Gas Reservoir
Table 2
Fracture classification table of the pressed core.
Level
Name
The main characteristics
Level I
Main fracture
The longest and widest extension runs through the core, most cores have only one main fracture.
Level II
Secondary fracture
The extension and width are large, but the penetration degree is poor, and there are no symmetrical fractures on the plane graph.
Level III
Branch fracture
The extension and penetration are poor, but have a certain width; it is very obvious in the image. The occurrence is not consistent with the main and secondary fracture.
Level IV
Associated fracture
Small fractures have low extension, penetration, and width.