Interaction Law between Natural Fractures-Vugs and Acid-Etched Fracture during Steering Acid Fracturing in Carbonate Reservoirs

Figure 6

Rock specimen before experiment: (a) specimen 1; (b) specimen 2; (c) specimen 3; (d) specimen 4. The picture on the left of each group is the specimen photo, and the picture on the right is a perspective view picture.

(a)

(b)

(c)

(d)