Hydrocarbon Migration of Silurian Paleo-pools in Tazhong and Tabei Areas of Tarim Basin
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摘要: 运用含氮化合物咔唑类探讨塔中、塔北地区在第一期成藏时志留系油气藏的烃类的运移方向, 为建立古油藏成藏模式, 预测原生油气藏分布提供依据.研究表明, 塔中志留系古油藏的油气主要来源于满加尔凹陷的中、下寒武统烃源岩, 向西南—南的方向首先进入塔中志留系, 然后沿不整合面或顺储层从北西向南东和从北东向南西2个方向向志留系在塔中地区的尖灭线附近运移.塔北志留系古油藏的油气也主要来自满加尔凹陷的中、下寒武统烃源岩, 首先向北西方向进入塔北隆起的志留系, 然后在志留系储层内或不整合面沿上倾方向继续向北西方向运移进入圈闭.Abstract: In order to establish the formation models of the Silurian paleo-pools and predict the distribution of the original hydrocarbon pools, hydrocarbon migration directions during the first Silurian pools filling stage in Tazhong and Tabei areas of the Tarim basin have been studied based on analysis of carbazole compounds. The results indicate that hydrocarbons in the Silurian paleo-pools of the Tazhong uplift mainly originated from the Lower and Middle Cambrian source rocks in the Manjiaer sag. These hydrocarbons flowed firstly southwest-southward into the Silurian reservoir beds in the Tazhong area. Then, they further migrated southeastward and southwestward, respectively, to the Silurian pinchouting zone in the Tazhong through unconformable surfaces or the reservoir beds. Hydrocarbons in Silurian pools in the Tabei uplift were also from the Lower and Middle Cambrian source rocks in the Manjiaer sag. They migrated northwestward firstly into the Silurian reservoir beds in the Tabei uplift, and then continued to flow into the traps in high positions in the same direction through the Silurian reservoirs or unconformable surfaces.
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Key words:
- nitrogen compound /
- carbazole /
- hydrocarbon migration /
- paleo-pools /
- Silurian /
- Tarim basin
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图 1 塔中(a) 及塔北(b) 地区采样井位置及志留系古油藏第一期成藏油气运移方向
Ⅰ.第1地带(巴东2井—塔中47井—塔中67井地带); Ⅱ.第2地带(塔中11井地带); Ⅲ.第3地带(塔中31井地带); Ⅳ.第4地带(塔中15井—塔中30井—塔中44井地带); Ⅴ.第5地带(塔中32井地带)
Fig. 1. Sample location and hydrocarbon migration directions of the first-stage hydrocarbon reservoir of the Silurian paleo-pools in Tazhong (a) and Tabei (b) area
图 3 塔北地区羊屋2井志留系沥青砂(7号样, 5 467.90 m) 的烷基咔唑(a)和苯并咔唑(b) 质量色谱图
a: 1.咔唑; 2.1—甲基咔唑; 3.3—甲基咔唑; 4.2—甲基咔唑; 5.4—甲基咔唑; 6.1, 8—二甲基咔唑; 7.1—乙基咔唑; 8.1, 3—二甲基咔唑; 9.1, 6—二甲基咔唑; 10.1, 7—二甲基咔唑; 11.1, 4—二甲基咔唑; 12.1, 5—二甲基咔唑; 13.二甲基咔唑; 14.2, 6—二甲基咔唑; 15.2, 7—二甲基咔唑; 16.1, 2—二甲基咔唑; 17.2, 4—二甲基咔唑; 18.2, 5—二甲基咔唑; 19.2, 3—二甲基咔唑; 20.3, 4—二甲基咔唑; 21.三甲基咔唑(A); 22.三甲基咔唑(B); 23.三甲基咔唑(C).b: 1.苯并咔唑[a]; 2.苯并咔唑[b]; 3.苯并咔唑[c]
Fig. 3. Mass chromatograms of alkylcarbazoles of the Silurian asphaltic sandstones of Yangwu 2 well in Tabei area (No.7, 5 467.90 m)
图 4 塔中地区各井的志留系干沥青中咔唑类化合物含量的平均值分布
Fig. 4. Average distribution of carbazole compound contents of the Silurian dry asphalts in different wells of Tazhong area
图 5 塔中地区各井的志留系干沥青中三甲基咔唑(A)/三甲基咔唑(C) 比值的平均值分布
Fig. 5. Average distribution of 3-methylcarbazoles (A)/3-methylcarbazoles (C) of the Silurian dry asphalts in different wells of Tazhong area
图 6 塔中地区构造单元划分及志留系古油藏第一期成藏时的油气运移方向
Fig. 6. Division of structural units and hydrocarbon migration directions of the first-stage hydrocarbon reservoir of the Silurian paleo-pools in Tazhong area
图 7 塔中地区各井的志留系干沥青中咔唑类化合物含量随深度变化
Fig. 7. Carbazole compound contents of the Silurian dry asphalts with depth change in different wells of Tazhong area
图 8 塔北地区各井的志留系干沥青中咔唑类化合物含量随深度变化
Fig. 8. Carbazole compound contents of the Silurian dry asphalts with depth change in different wells of Tabei area
表 1 塔里木盆地志留系干沥青中咔唑类含氮化合物含量
Table 1. Contents of carbazole compounds of the Silurian dry asphalts in Tarim basin
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