雷竞技app官方版下载ios-雷竞技官方平台
doi: 10.11781/sysydz202402366
1.
中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126
2.
中国石化油气成藏重点实验室, 江苏 无锡 214126
3.
中国石化 华北油气分公司 油气勘探管理部, 郑州 450006
4.
中国石化 华北油气分公司 勘探开发研究院, 郑州 450006
详细信息
中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126
中国石化油气成藏重点实验室, 江苏 无锡 214126
中国石化 华北油气分公司 油气勘探管理部, 郑州 450006
中国石化 华北油气分公司 勘探开发研究院, 郑州 450006
Geochemical characteristics of light hydrocarbons in Upper Paleozoic tight gas from Daniudi Gas Field, Ordos Basin
1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China
3.
Department of Oil and Gas Exploration Management, SINOPEC North China Company, Zhengzhou, Henan 450006, China
4.
Research Institute of Exploration and Production, SINOPEC North China Company, Zhengzhou, Henan 450006, China
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China
Department of Oil and Gas Exploration Management, SINOPEC North China Company, Zhengzhou, Henan 450006, China
Research Institute of Exploration and Production, SINOPEC North China Company, Zhengzhou, Henan 450006, China
雷竞技官方平台:
大牛地气田是鄂尔多斯盆地典型致密砂岩大气田之一。为了更深入了解该区天然气的成因和来源，揭示天然气运移相态，对大牛地气田上古生界致密气开展了轻烃地球化学特征分析。研究表明，该区上古生界致密气C5-7轻烃组成具有异构烷烃优势分布，C6-7轻烃组成中芳烃含量整体偏低(＜10%)，甚至未检出芳烃，C7轻烃组成具有甲基环己烷优势分布特征，甲基环己烷相对含量均超过50%。上二叠统下石盒子组天然气K1值、K2值均与二叠系山西组和石炭系太原组天然气一致，而δ13C1值则与山西组天然气一致，与太原组天然气有明显不同。与山西组天然气相比，下石盒子组天然气整体具有偏低的苯/正己烷、苯/环己烷和甲苯/正庚烷比值，以及明显偏高的正庚烷/甲基环己烷比值。轻烃地球化学特征及烷烃气碳氢同位素组成综合表明，大牛地气田上古生界天然气为典型煤成气，其中山西组和太原组天然气均为原地自生自储，而下石盒子组天然气为下伏山西组烃源岩生成的天然气经历了游离相垂向运移聚集形成，太原组烃源岩不具有显著贡献。受天然气运移和水溶等作用影响，庚烷值、异庚烷值、苯/正己烷比值等轻烃指标直接用于判识大牛地气田致密气成熟度会存在偏差。
Abstract:
The Daniudi Gas Field is one of the typical tight sandstone gas fields in the Ordos Basin. In order to better understand the genetic types and source of natural gas and reveal the migration phase of natural gas, the geochemical analysis of light hydrocarbons in the Upper Paleozoic tight gas from the Daniudi Gas Field has been conducted in this study. The results indicate that, the C5-7 light hydrocarbons in the Upper Paleozoic tight gas are dominated by iso-alkanes, and the C6-7 light hydrocarbons display low contents of aromatics (< 10%), which are even undetectable. The C7 light hydrocarbons are dominated by methylcyclohexane (MCH) with the relative MCH contents exceeding 50%. The K1 and K2 values of natural gas from the Lower Shihezi Formation (P1x) are consistent with those from the Shanxi (P1s) and Taiyuan (C3t) formations, respectively. The δ13C1 values of the P1x gas are consistent with those of the P1s gas and significantly different from those of the C3t gas. Compared with the P1s gas, the P1x gas mainly displays lower benzene/n-hexane, benzene/cyclohexane and toluene/n-heptane ratios, as well as significantly higher n-heptane/methylcyclohexane ratios. Geochemical characteristics of light hydrocarbons and carbon and hydrogen isotopic compositions of alkanes indicate that, the Upper Paleozoic natural gas from the Daniudi Gas Field is typical coal-derived gas. The P1s and C3t gases were in-situ self-generated and self-accumulated, whereas the P1x gas was mainly derived from the underlying P1s source rocks and accumulated via vertical migration in free phase, with insignificant contributions of the C3t source rocks. Due to the effect of migration and water solution of natural gas, the deviation exists in the identification of thermal maturity for tight gas from the Daniudi Gas Field using the light hydrocarbon indexes such as heptane and isoheptane values and benzene/n-hexane ratios.
图 1 鄂尔多斯盆地大牛地气田位置(a)及地层综合柱状图(b)
据参考文献[24]修改。
Figure 1. Location of Daniudi Gas Field in Ordos Basin (a) and stratigraphic column (b)
图 2 大牛地气田上古生界天然气轻烃色谱图
1.2-甲基戊烷；2.3-甲基戊烷；3.正己烷；4.甲基环戊烷；5.苯；6.环己烷；7.2-甲基己烷；8.3-甲基己烷；9.正庚烷；10.甲基环己烷。
Figure 2. Chromatogram of light hydrocarbons in natural gas from Upper Paleozoic, Daniudi Gas Field
图 3 大牛地气田上古生界天然气C5-7正构烷烃、异构烷烃和环烷烃组成
底图据戴金星等[27]。
Figure 3. Ternary diagram of n-C5-7, iso-C5-7 and cyc-C5-7 in natural gas from Upper Paleozoic, Daniudi Gas Field
图 4 大牛地气田上古生界天然气正庚烷、甲基环己烷和二甲基环戊烷相对组成
底图据戴金星等[27]。
Figure 4. Ternary diagram of n-heptane, methylcyclohexane and various dimethylcyclopentane in natural gas from Upper Paleozoic, Daniudi Gas Field
图 5 大牛地气田上古生界天然气δD1与δ13C1值相关图
底图据参考文献[28]。
Figure 5. Correlation between δD1 and δ13C1 values of natural gas from Upper Paleozoic, Daniudi Gas Field
图 6 大牛地气田上古生界天然气庚烷值和异庚烷值相关图
底图据THOMPSON[18]。
Figure 6. Correlation between heptane and isoheptane values of natural gas from Upper Paleozoic, Daniudi Gas Field
图 7 大牛地气田上古生界天然气苯/正己烷(a)、甲苯/正庚烷(b)比值与δ13C1值相关图
Figure 7. Correlation between benzene/n-hexane (a), toluene/n-heptane (b) and δ13C1 values of natural gas from Upper Paleozoic, Daniudi Gas Field
图 8 大牛地气田上古生界天然气(2-MH+2, 3-DMP)/C7与(3-MH+2, 4-DMP)/C7相关图
Figure 8. Correlation between (2-MH+2, 3-DMP)/C7 and (3-MH+2, 4-DMP)/C7 of natural gas from Upper Paleozoic, Daniudi Gas Field
图 9 大牛地气田上古生界天然气(P2+N2)/C7与P3/C7相关图
Figure 9. Correlation between (P2+N2)/C7 and P3/C7 of natural gas from Upper Paleozoic, Daniudi Gas Field
图 10 大牛地气田上古生界天然气δ13C1(a)和δ13C2(b)与正庚烷/甲基环己烷相关图
Figure 10. Correlation between δ13C1 (a), δ13C2 (b) and n-heptane/methyl-cyclohexane of natural gas from Upper Paleozoic, Daniudi Gas Field
图 11 大牛地气田下石盒子组(P1x)天然气苯/正己烷(a)和正庚烷/甲基环己烷比值(b)分布
Figure 11. Distribution of benzene/n-hexane (a) and n-heptane/methylcyclohexane (b) ratios of Lower Shihezi natural gas from Daniudi Gas Field
图 12 大牛地气田上古生界天然气苯/正己烷与苯/环己烷(a)、甲苯/正庚烷(b)相关图
Figure 12. Correlation between benzene/cyclohexane (a), toluene/n-heptane (b) and benzene/n-hexane of Upper Paleozoic natural gas from Daniudi Gas Field
表 1 大牛地气田上古生界天然气轻烃相对组成和烷烃气碳氢同位素值
Table 1. Relative composition of light hydrocarbons and carbon and hydrogen isotopic values of alkanes in natural gas from Upper Paleozoic, Daniudi Gas Field
井号
深度/m
层位
C5-7相对组成/%
C6-7相对组成/%
C7相对组成/%
甲基环己烷指数/%
δ13CV-PDB /‰
δD1 V-SMOW / ‰
正构烷烃
异构烷烃
环烷烃
链烷烃
环烷烃
芳烃
二甲基环戊烷
正庚烷
甲基环己烷
CH4
C2H6
D1
P1x
23.8
49.8
26.4
52.0
47.2
0.8
24.4
12.9
62.7
61.3
-37.4
-25.7
-201
D2
2 548
P1x
24.2
50.9
24.8
62.0
36.8
1.3
21.0
22.8
56.2
55.2
-35.8
-26.1
-181
D3
2 633
P1x
22.4
51.1
26.5
52.4
46.0
1.6
25.8
11.5
62.8
61.4
-37.7
-25.2
-197
D4
2 675
P1x
28.6
54.1
17.3
77.0
22.5
0.5
19.3
38.3
42.4
41.9
-35.8
-26.2
-181
D5
2 709
P1x
34.8
44.5
20.7
70.5
28.9
0.6
18.9
39.1
42.0
41.4
-35.5
-26.5
-185
D6
2 716
P1x
23.8
48.3
27.9
58.8
40.6
0.6
36.7
18.3
45.0
44.4
-37.1
-25.9
-197
D7
2 749
P1x
29.9
43.9
26.2
62.9
36.3
0.7
17.2
32.0
50.8
50.0
-34.3
-25.9
-181
D8
2 789
P1x
23.6
54.8
21.6
59.8
39.8
0.4
29.2
14.5
56.3
55.2
-34.7
-25.4
-189
D9
2 660
P1x
31.0
44.1
24.9
65.7
34.3
-
16.0
32.4
51.6
50.9
-35.7
-26.0
-184
D10
2 631
P1x
22.6
53.3
24.1
54.9
44.7
0.4
28.2
10.4
61.4
60.2
-37.2
-24.9
-198
D11
2 667
P1x
22.8
48.5
28.7
58.7
40.3
1.0
16.4
24.0
59.5
58.6
-34.5
-25.8
-181
D12
2 669
P1x
34.5
43.7
21.8
70.1
29.7
0.2
13.7
38.3
48.0
47.3
-35.4
-25.7
-182
D13
2 673
P1x
19.6
52.1
28.2
55.9
44.0
0.1
20.9
11.4
67.7
66.6
-34.6
-25.2
-183
D14
2 698
P1x
34.4
47.5
18.1
75.6
24.4
-
25.6
37.7
36.7
36.4
-35.5
-26.2
-188
D15
2 703
P1x
20.9
52.4
26.7
57.7
42.3
-
20.8
15.0
64.3
63.3
-34.9
-25.6
-180
D16
2 700
P1x
28.3
51.2
20.5
72.1
27.9
-
14.9
38.0
47.0
46.6
-35.5
-25.7
-182
D17
2 635
P1x
25.5
54.8
19.7
63.8
36.2
-
29.4
15.0
55.6
54.6
-36.6
-26.0
-197
D18
2 716
P1x
21.1
51.3
27.5
57.4
42.6
-
20.8
14.8
64.4
63.5
-35.0
-25.6
-181
D19
2 675
P1x
24.6
52.1
23.3
65.1
34.9
-
16.8
25.7
57.5
56.8
-35.0
-26.2
-180
D20
2 685
P1x
25.8
48.7
25.5
63.9
36.1
-
17.2
28.4
54.4
53.9
-35.2
-25.8
-181
D21
2 680
P1x
22.8
51.5
25.7
61.0
39.0
-
17.6
21.9
60.5
59.8
-35.1
-26.0
-179
D22
2 630
P1s
24.5
53.7
21.8
60.3
38.8
0.8
26.2
17.1
56.7
55.6
-36.0
-25.1
-197
D23
2 830
P1s
24.1
52.5
23.4
58.5
39.7
1.8
26.5
17.2
56.4
55.3
-36.0
-25.3
-195
D24
2 783
P1s
21.6
47.0
31.4
44.4
47.5
8.1
20.2
11.2
68.6
67.2
-35.0
-24.0
-196
D25
2 831
P1s
22.9
52.0
25.1
57.3
41.4
1.3
28.5
14.7
56.9
55.9
-35.9
-24.6
-193
D26
2 819
P1s
25.1
51.6
23.3
58.1
41.2
0.7
20.5
17.4
62.1
60.7
-33.3
-24.8
-179
D27
2 812
P1s
23.3
49.1
27.6
53.4
44.0
2.6
22.1
14.7
63.1
61.9
-34.1
-24.8
-186
D28
2 846
P1s
21.5
46.2
32.3
55.8
41.6
2.6
31.5
17.1
51.4
50.6
-35.8
-24.5
-193
D29
2 744
P1s
19.7
49.6
30.7
49.0
49.3
1.7
20.4
9.2
70.4
69.1
-33.8
-23.9
-192
D30
2 879
P1s
22.1
53.5
24.4
56.2
43.8
-
22.0
11.0
67.0
65.9
-34.5
-25.1
-186
D31
2 881
P1s
32.5
50.8
16.7
62.4
35.9
1.7
35.3
14.0
50.7
50.1
-37.0
-25.0
-209
D32
2 826
P1s
22.5
51.8
25.8
55.5
44.5
-
21.1
12.0
66.8
65.6
-34.4
-25.5
-187
D33
P1s
28.4
45.3
26.3
49.3
50.3
0.5
20.1
15.0
64.8
63.6
-36.9
-25.0
-201
D34
2 820
P1s
24.6
54.5
20.9
56.4
42.9
0.7
24.8
12.9
62.4
61.3
-36.2
-24.2
-201
D35
2 795
C3t
25.8
49.9
24.3
57.0
39.9
3.1
20.3
17.2
62.5
61.4
-37.5
-25.5
-201
D36
2 439
C3t
27.7
51.7
20.6
61.7
36.6
1.7
22.8
19.6
57.6
56.6
-37.5
-26.1
-204
D37
2 417
C3t
23.6
48.2
28.2
53.4
41.9
4.6
17.6
16.5
65.9
64.4
-37.9
-25.2
-197
D38
2 557
C3t
22.5
48.9
28.6
55.0
42.0
3.0
21.8
17.3
60.9
59.8
-37.7
-25.0
-195
D39
2 570
C3t
21.7
44.6
33.8
47.4
45.7
6.9
19.5
16.2
64.3
62.9
-37.8
-24.8
-197
D40
2 795
C3t
24.9
51.6
23.5
58.2
41.1
0.7
21.7
12.6
65.7
64.6
-38.0
-25.3
-205
D41
2 453
C3t
26.2
54.3
19.5
62.7
36.7
0.7
22.6
11.6
65.8
64.7
-37.8
-25.1
-204
D42
2 455
C3t
25.5
49.8
24.7
56.4
43.6
-
21.6
12.2
66.3
65.2
-37.7
-24.9
-205
D43
2 466
C3t
24.4
51.5
24.1
55.4
43.5
1.1
19.5
10.4
70.2
68.9
-37.8
-25.2
-204
D44
2 462
C3t
20.8
52.6
26.6
57.6
41.7
0.7
19.3
15.2
65.5
64.4
D45
C3t
27.4
54.5
18.1
65.2
34.4
0.5
29.0
13.7
57.3
56.5
-37.2
-25.4
-198
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表 2 大牛地气田上古生界天然气轻烃地球化学特征参数
Table 2. Typical geochemical parameters of light hydrocarbons in natural gas from Upper Paleozoic, Daniudi Gas Field
井号
层位
庚烷值/%
异庚烷值
2, 4-二甲基戊烷/2, 3-二甲基戊烷
气源岩最大埋深温度/℃
苯/正己烷
苯/环己烷
正庚烷/甲基环己烷
甲苯/正庚烷
K1
P2/C7/%
N2/C7/%
P3/C7/%
K2
D1
P1x
8.18
1.18
0.777
136.2
0.076
0.099
0.205
0.005
1.09
13.76
8.83
7.61
0.34
D2
P1x
12.50
2.44
0.771
136.1
0.101
0.140
0.406
0.012
1.09
21.26
6.66
10.91
0.39
D3
P1x
7.18
1.19
0.844
137.5
0.115
0.138
0.183
0.136
1.04
13.83
8.82
8.54
0.38
D4
P1x
18.53
4.48
0.966
139.5
0.028
0.093
0.905
-
1.09
28.30
5.27
15.11
0.45
D5
P1x
22.67
2.73
1.068
141.0
0.025
0.080
0.932
0.012
1.09
23.02
6.11
9.09
0.31
D6
P1x
9.28
1.58
0.849
137.5
0.048
0.071
0.406
-
1.15
20.89
10.06
10.58
0.34
D7
P1x
19.23
2.55
0.815
136.9
0.050
0.098
0.630
0.002
1.09
20.39
6.20
9.04
0.34
D8
P1x
8.73
1.33
0.976
139.6
0.029
0.052
0.258
0.007
1.06
16.54
9.33
9.06
0.35
D9
P1x
19.07
2.86
0.777
136.2
-
-
0.629
-
1.07
20.84
5.38
9.53
0.36
D10
P1x
6.31
1.14
0.799
136.6
0.039
0.050
0.169
-
1.06
13.70
9.19
8.95
0.39
D11
P1x
13.49
2.90
0.666
133.9
0.096
0.101
0.403
-
1.10
20.05
5.84
10.74
0.41
D12
P1x
24.31
2.74
0.629
133.0
0.007
0.024
0.799
0.003
1.06
18.49
4.91
10.35
0.44
D13
P1x
6.24
2.19
0.732
135.3
-
-
0.168
0.031
1.05
18.27
6.96
10.81
0.43
D14
P1x
17.59
3.23
1.074
141.1
-
-
1.026
-
1.08
26.82
6.38
13.29
0.40
D15
P1x
8.10
2.10
0.660
133.8
-
-
0.233
-
1.06
17.55
6.72
11.36
0.47
D16
P1x
19.67
4.81
0.741
135.5
-
-
0.809
-
1.06
26.25
4.52
13.81
0.45
D17
P1x
8.79
1.37
0.923
138.8
-
-
0.271
-
1.02
16.12
8.81
10.06
0.40
D18
P1x
8.13
2.20
0.767
136.0
-
-
0.230
-
1.09
18.47
6.82
11.06
0.44
D19
P1x
13.99
3.45
0.766
136.0
-
-
0.447
-
1.06
22.33
5.68
11.79
0.42
D20
P1x
16.13
2.84
0.674
134.1
-
-
0.522
-
1.10
21.10
5.56
11.23
0.42
D21
P1x
12.05
2.79
0.686
134.3
-
-
0.361
-
1.06
19.24
5.73
12.22
0.49
D22
P1s
10.24
1.49
0.896
138.4
0.050
0.090
0.301
0.053
1.08
17.12
8.41
9.21
0.36
D23
P1s
10.10
1.45
0.839
137.4
0.150
0.227
0.304
0.011
1.07
16.32
8.46
9.49
0.38
D24
P1s
6.69
1.46
0.588
132.0
0.711
0.507
0.163
0.651
1.13
13.31
7.14
7.70
0.38
D25
P1s
8.49
1.31
0.928
138.9
0.114
0.162
0.258
0.004
1.00
14.80
8.64
12.79
0.55
D26
P1s
10.61
1.84
0.837
137.3
0.054
0.092
0.280
0.006
1.09
16.03
6.24
8.09
0.36
D27
P1s
8.73
1.64
0.785
136.4
0.238
0.263
0.233
0.008
1.09
16.21
7.75
8.91
0.37
D28
P1s
9.23
1.54
0.898
138.4
0.164
0.220
0.333
0.139
1.10
18.88
9.24
10.14
0.36
D29
P1s
5.52
1.50
0.748
135.6
0.210
0.148
0.131
-
1.02
13.60
7.28
10.09
0.48
D30
P1s
6.35
1.79
0.673
134.1
-
-
0.165
-
1.05
16.01
7.35
10.11
0.43
D31
P1s
6.24
1.41
0.876
138.0
0.096
0.172
0.276
-
1.10
14.29
8.33
9.09
0.40
D32
P1s
6.96
1.75
0.677
134.2
-
-
0.180
-
1.10
15.85
7.23
9.85
0.43
D33
P1s
9.75
1.22
0.537
130.7
0.036
0.044
0.232
-
1.14
12.87
7.87
5.16
0.25
D34
P1s
7.79
1.32
0.840
137.4
0.058
0.080
0.206
-
1.08
14.43
8.62
7.90
0.34
D35
C3t
9.79
2.01
0.745
135.6
0.252
0.330
0.275
-
1.10
17.87
7.09
9.55
0.38
D36
C3t
10.62
1.99
0.805
136.7
0.123
0.187
0.341
0.004
1.08
18.69
7.00
10.67
0.42
D37
C3t
9.74
2.22
0.700
134.6
0.432
0.481
0.250
0.015
1.07
17.71
6.52
9.19
0.38
D38
C3t
10.12
2.28
1.308
144.0
0.305
0.324
0.285
0.008
1.07
22.50
7.50
7.50
0.25
D39
C3t
9.31
1.99
0.644
133.4
0.762
0.587
0.252
0.007
1.10
17.79
6.90
8.89
0.36
D40
C3t
6.98
1.95
0.788
136.4
0.055
0.067
0.192
0.016
1.05
17.59
7.07
9.62
0.39
D41
C3t
6.32
1.90
0.781
136.3
0.047
0.069
0.176
0.027
1.09
16.75
7.26
10.22
0.43
D42
C3t
6.87
1.79
0.799
136.6
-
-
0.184
0.007
1.04
16.68
7.41
8.79
0.36
D43
C3t
6.01
1.93
0.774
136.2
0.094
0.106
0.148
0.014
1.07
16.25
6.76
8.79
0.38
D44
C3t
8.74
2.35
0.625
133.0
0.076
0.079
0.232
-
1.11
18.69
7.06
11.10
0.43
D45
C3t
7.12
1.60
0.742
135.5
0.035
0.059
0.239
-
1.10
16.10
7.66
12.42
0.52
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