Table 5.

Table 5. Volume of natural gas within the downhole log-inferred free-gas occurrences at Sites 994, 995, and 997 on the Blake Ridge.

Site Depth of identified free-gas zones
(mbsf) Thickness of free
gas-bearing zone
(m) Sediment porosity
(%) Free-gas
saturation
(%) Volume of
in-place gas/km²(m³) Volume of gas within free-gas/km² at STP
(m³)

994
541-605
64
53.2
1.38
468,761
96,096,005

995
450-480
30
55.4
0.60
99,010
24,752,500

995
582-624
42
52.5
0.64
141,640
30,594,240

997
451-520
69
54.5
4.83
1,818,083
410,886,758

977
567-692
125
52.9
2.63
1,740,780
332,488,980

Site	Depth of identified free-gas zones (mbsf)	Thickness of free gas-bearing zone (m)	Sediment porosity (%)	Free-gas saturation (%)	Volume of in-place gas/km²(m³)	Volume of gas within free-gas/km² at STP (m³)
994	541-605	64	53.2	1.38	468,761	96,096,005
995	450-480	30	55.4	0.60	99,010	24,752,500
995	582-624	42	52.5	0.64	141,640	30,594,240
997	451-520	69	54.5	4.83	1,818,083	410,886,758
977	567-692	125	52.9	2.63	1,740,780	332,488,980

Notes: Volume of in-place gas at in situ pressure and temperature conditions. STP: pressure = 101 kPa, temperature = 15ºC.