Page 119 - Fundamentals of Gas Shale Reservoirs

RESULTS 99
TabLE 5.3 Nitrogen adsorption results and pore volume percentages based on IuPaC classification from the gas shale collection

% DFT model (porosity)
Total pore Vol.
BET surface (cm /100g) at Average pore
3
2
Formation SAMPLE ID area (m /g) maximum pressure radius (nm) Micropore Vol. Meso pore Vol. Macropore Vol.
PCm 8 5.4 1.54 5.7 5.4 85.7 8.9
9 7.6 1.67 4.4 4.4 93.0 2.7
11 2.3 0.99 8.5 1.1 84.0 15.0
12 4.3 1.19 5.6 1.0 93.0 6.3
13 4.9 1.28 5.2 5.6 72.0 22.5
14 7.8 1.57 4.0 11.2 78.6 10.3
15 6.0 1.28 4.3 10.1 75.8 14.0
16 7.8 1.55 4.0 11.3 75.8 13.0
CCm 17 8.7 3.04 7.0 3.0 78.2 18.8
18 3.4 1.83 10.8 1.9 63.7 34.4
19 2.8 1.49 10.8 2.7 76.2 21.1
20 2.8 1.42 10.5 2.6 77.2 20.2
21 7.7 2.69 7.0 2.5 81.8 15.7
22 3.4 1.39 8.2 3.0 77.9 19.1
23 2.0 1.04 10.3 2.9 74.7 22.4
24 2.1 1.36 13.1 0.0 66.4 33.6
25 2.0 0.96 9.6 0.0 78.2 21.8
26 6.3 3.09 9.9 0.0 80.0 20.0
27 18.0 3.6 4.0 11.7 79.3 9.1
PKm 28.0 10.0 1.6 6.3 14.8 82.9 2.4
29.0 5.4 1.1 8.4 9.3 87.0 3.7

0.0012 0.0012
Micropores Mesopores Macropores
Micropores Mesopores Macropores
0.001 PCM 8 0.001 CCM 17
Incremental volume (cm 3 /g) 0.0008 9 12 Incremental volume (cm 3 /g) 0.0008 18

19
20
0.0006
0.0006
14
21
22
15
0.0004
24
25
0.0002 0.0004 23
0.0002
26
27
0 0
0.1 1 10 100 1000 0.1 1 10 100 1000
Pore width (nm) Pore width (nm)
FIGurE 5.14 Pore size distribution from nitrogen adsorption FIGurE 5.15 Pore size distribution from nitrogen adsorption
tests with IUPAC boundaries of micro‐, meso‐, and macropores for tests with IUPAC boundaries of micro‐, meso‐, and macropores for
PCM samples. CCM samples.

Saturated samples recorded total NMR porosity of 12.3 This secondary population T is more likely the effect of
2L
± 3%. The average total NMR porosity contribution of the the macropores filled by brine during the saturation process,
T is 87 and 93% for PCM and CCM, respectively. The T with porosity reaching values of >10% when it was only 4 ±
2s
2L
contributed 13 and 7% for PCM and CCM, respectively. 1.5% under partial‐saturation conditions (Table 5.4).