The Accumulation Characteristics of the Paleozoic Reservoir in the Central-Southern Ordos Basin Recorded by Organic Inclusions
Table 1
Results of gaseous hydrocarbon composition and methane isotope analysis of inclusions analyzed by inclusion opening method.
Sample
Lithology
Stratum/depth
Composition
C1
C2
C3
C4
C5
∑Ci
δ13C1
δDSMOW
L1 well
Sandstone
Shanxi Formation/3424.08
a
0.8132
0.4051
0.2071
0.143
0.086
1.6544
-29.63
-102.78
b
49.15
24.49
12.52
8.64
5.20
100
Dolomite
Majiagou Formation/3563.50
a
1.9616
0.6461
0.1664
0.1172
0.0905
2.9818
-33.29
-128.3
b
65.79
21.67
5.58
3.93
3.04
100
Xt 1 well
Dolomite
Majiagou/
a
1.8946
0.1947
0.1007
0.0568
0.0118
2.2586
-37.76
-132.19
b
83.88
8.62
4.46
2.51
0.52
100
Y2 well
Sandstone
Benxi Formation/2503.1
a
2.0206
0.4514
0.1621
0.1074
0.0146
2.7561
-30.22
-96.37
b
73.31
16.38
5.88
3.90
0.53
100
F6 well
Dolomite
Majiagou Formation/2770.9
a
1.8991
0.2191
0.1434
0.0861
0.041
2.3887
-33.35
-111.03
b
79.51
9.17
6.01
3.60
1.72
100
2770.17-2770.89
c
77.49
21.77
0.37
0.37
0.00
100
——
——
Note: a: gas content, unit: m3/t rock; b: relative content, Ci/Ci (×100%); c: relative gas content, %, obtained from gas logging in well section 2770.17-2770.89 m.
