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Orderly coexistence and accumulation models of conventional and unconventional hydrocarbons in Lower Permian Fengcheng Formation, Mahu sag, Junggar Basin
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ZHI Dongming,TANG Yong,HE Wenjun,GUO Xuguang,ZHENG Menglin,HUANG Liliang
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Table 1 Geochemical parameters of hydrocarbon source rocks of different lithologies from the Fengcheng Formation of the Mahu sag, Junggar Basin.
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| Lithology | TOC/% | S1/(mg·g-1) | (S1+S2)/(mg·g-1) | HI/(mg·g-1) | Tmax/°C | Value
range | Proportion of
values larger than 0.6 | Value range | Proportion of values larger than 1 | Value
range | Proportion of values larger than 2 | Value
range | Proportion of values larger than 250 | | Mudstone | Dolomitic mudstone,
silty mudstone,
tuffaceous mudstone | 0.03-2.79
1.04(157) | 71.34% | 0.01-9.35
1.42(154) | 51.30% | 0.01-25.29
5.18(157) | 71.34% | 2.67-981.82
290.97(157) | 52.23% | 359-489
426(157) | | Dolomite | Silty dolomite,
argillaceous dolomite, tuffaceous dolomite | 0.12-3.11
0.99(48) | 68.75% | 0.01-3.79
0.77(47) | 25.53% | 0.01-23.58
4.82(48) | 68.75% | 3.33-817.05
331.61(48) | 66.67% | 311-579
430(48) | | Tuff | Silty tuff,
dolomitic tuff,
tuffite | 0.25-3.58
1.02(31) | 64.52% | 0.01-3.62
0.71(31) | 29.03% | 0.01-24.05
4.07(31) | 64.52% | 10.34-688.46
331.61(30) | 66.67% | 407-454
434(31) | | Siltstone | Dolomitic siltstone,
tuffaceous siltstone,
argillaceous siltstone | 0.20-4.08
1.96(31) | 96.77% | 0.05-3.93
2.45(31) | 96.77% | 0.27-14.13
8.23(31) | 96.77% | 110.00-490.40
310.75(31) | 74.19% | 411.0-430.0
421.7(31) |
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