Sample No.

Porosity by CT Scan

Porosity by Helium method

Error

Rock type

FD1

25.35

25.20

0.15

Carbonate

FD2

32.24

32.80

−0.56

Carbonate

FD3

16.53

15.96

0.57

Sandstone

FD4

21.49

21.70

−0.21

Sandstone

FD5

2.72

2.65

0.07

Granite

FD6

43.81

41.70

2.11

Carbonate

FD7

35.09

34.10

0.98

Carbonate

FD8

29.45

28.60

0.85

Sandstone

FD9

24.39

24.50

−0.11

Sandstone