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U.S. Geological Survey Open-File Report 03-041
Version 1.0

Table 2A

Table 2A:  Molecular composition of gases from NPRA wells sampled by USGS, 1998 to 2001.
Field Well Test No. Depth, ft. CO2 N2 CH4 C2H6 C3H8 i-C4H10 n-C4H10 i-C5H12 n-C5H12 C6+
Gubik Gubic Test Well No. 2 27180 1834.0 0.12 1.76 96.88 0.73 0.035 0.0082 0.049 0.033 0.0056 0.013
Simpson Simpson Core Test 27 22201 1500.0 0.23 0.91 98.73 0.031 0.005
Simpson Simpson Core Test 30/30A 27181 701.0 0.11 2.28 97.52 0.015 0.0006
Simpson Simpson Core Test 31 27182 355.0 0.15 1.52 98.26 0.017 0.0005
Umiat Umiat No. 8 98RCB30 1312.0 0.08 0.19 97.3 1.89 0.22 0.034 0.14 0.051 0.028 0.052
Wolf Creek Wolf Creek No. 1 27179 1500.0 0.31 0.55 98.79 0.17 0.012 0.0081 0.0057
Wolf Creek Wolf Creek No. 1 21478 1500.0 0.31 0.25 99.2 0.17 0.014 0.0085 0.0018
Walakpa Walakpa No. 2 34477 2618.0 0.01 0.16 97.54 1.72 0.38 0.052 0.051 0.014 0.0061 0.047
E. Barrow East Barrow No. 14 35430 2038.5 0.05 1.4 97.96 0.46 0.011 0.0011 0.019 0.009 0.0066 0.039
E. Barrow East Barrow No. 21 35431 2012.0 0.2 4.93 94.04 0.38 0.033 0.0065 0.11 0.06 0.022 0.04
E. Barrow East Barrow No. 19 35433 2031.0 0.18 2.32 96.73 0.44 0.032 0.0083 0.089 0.048 0.019 0.037
E. Barrow East Barrow No. 15 35432 2102.5 0.09 0.77 98.1 0.87 0.048 0.026 0.014 0.0092 0.0036 0.037
S. Barrow South Barrow No. 8 35436 2309.5 0.06 0.55 98.46 0.85 0.024 0.011 0.007 0.0033 0.002 0.0088
S. Barrow South Barrow No. 13 35425 2296.0 0.13 0.71 98.11 0.94 0.031 0.021 0.012 0.0065 0.0034 0.01
S. Barrow South Barrow No. 11 35428 2265.0 0.19 0.6 97.98 1.13 0.029 0.022 0.01 0.0059 0.0033 0.014
S. Barrow South Barrow No. 10 35429 2300.0 0.27 0.72 97.93 0.97 0.026 0.023 0.0089 0.0061 0.0031 0.016
S. Barrow South Barrow NSB No1 35427 2299.5 0.27 0.73 97.93 0.96 0.026 0.023 0.0092 0.0061 0.0036 0.015
S. Barrow South Barrow No. 6 35434 2309.5 0.27 0.72 97.93 0.97 0.026 0.023 0.0092 0.006 0.003 0.018
S. Barrow South Barrow No 9 35435 2414.5 0.27 0.72 97.92 0.98 0.027 0.023 0.0092 0.0062 0.0032 0.018
S. Barrow South Barrow NSB No. 2 35426 2226.0 0.06 0.84 97.95 1.01 0.027 0.017 0.012 0.0052 0.003 0.0049
Notes:
Test No. is laboratory identification number
Depth is in feet to mid-point of perforation or bottom of casing.
Composition is in mole %.  Trace amounts of He, H2, Ar, and O2 are not included.
Empty cells indicate that component was not detected.
C6+ indicates the quantity of hexane and higher hydrocarbons.
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