Table 1 The basic parameters of the coal samples.

From: Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal

Sample

Coal types

Ro,max/%

f

Porosity/%

S1

Gas coal

0.72

0.55

3.71

S2

Fat coal

1.15

0.46

2.97

S3

Coking coal

1.53

0.63

5.06

S4

Lean coal

2.13

0.61

3.23

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