Stimulation Techniques of Coalbed Methane Reservoirs

Figure 19

The pore change rate of different stimulation methods with maximum vitrinite reflectance (the data come from the literatures [20, 50, 72, 78, 79, 86, 94, 96, 123–132])Note: (i) For the same coal sample with the same stimulation method, only the maximum was used for plotting, and (ii) for the samples using microbial stimulation, the total pore volume was substituted into Eq.(1) instead of porosity because of the lack of data.