Figure 2

Photomicrographs showing the petrological characteristics of the metamorphic rock reservoir: (a) sample 1, chlorite schist (−); (b) sample 1, sample 2, chlorite schist ( +); (c) sample 4, mica schist ( +); (d) sample 3, mica schist (−); (e) sample 5, mylonite ( +); (f) sample 7, mylonite ( +).