Table 4 NMR porosity of duplicate samples subject to different workflows.

From: Characterizing low-permeable shales using Rock-Eval pyrolysis and nuclear magnetic resonance for reconstruction of fluid saturation model

Sample ID

Lithotype

Φ (Sas−is) (%)

Φ (Sdec) (%)

Φ* (Sdry) (%)

Φopen (Sdec-Sas−is/ Sdec-Sdry) (%)

1095

Clays (54.0 wt% clays)

8.23

8.86

4.12

0.86

1095D

7.07

6.99

4.16

2.53

1099

Silicites (7.3 wt% clays)

7.71

10.93

5.49

2.92

1099D

7.33

11.96

5.68

5.93

1104

Silicites with clays (37.2 wt% clays)

8.81

12.14

5.45

2.93

1104D

9.12

9.80

6.26

3.30

1106

Clays with silica (59.6 wt% clays)

7.90

9.59

2.16

1.67

1106D

6.33

10.99

2.16

8.28

1108

Mixtite (40.2 wt% clays)

5.35

7.73

2.49

2.10

1108D

5.89

6.86

2.60

3.89

  1. *Porosity value of dried samples is based on the remaining fluid in the rock and should not be considered as the actual porosity of the sample.
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