Hydrocarbon origin and reservoir forming model of Wuyunting structure in Xihu Depression, East China Sea Basin
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摘要: 近年来，东海盆地西湖凹陷平湖斜坡带武云亭构造油气勘探获得了较好的商业发现，但已钻探的A井与B井流体性质差异较大，A井为气井、B井为油井。通过生物标志化合物对比、碳同位素分析及流体包裹体分析，对武云亭构造油气来源、充注期次及成藏模式进行了分析，结果表明武云亭构造油为正常成熟原油，主要来源于本地宁波19洼平湖组煤系烃源岩；天然气有两种，一种为高成熟天然气，主要来源于东侧主洼宁波27洼平湖组烃源岩，另一种为正常成熟天然气，主要来源于本地次洼宁波19洼烃源岩。包裹体荧光呈现为淡黄色油气包裹体和无色气包裹体，均一温度表明武云亭构造主要经历两期油气充注，时间为2 Ma和现今。武云亭构造油气来源丰富，成藏过程复杂，基于油气来源及成藏特征划分为"双源侧向晚期次生型"和"单源垂向晚期原生型"两种成藏模式。Abstract: In recent years, the oil and gas exploration of the Wuyunting structure in the Pinghu slope belt of Xihu Depression of the East China Sea Basin has reported good commercial discoveries, but the fluid properties of wells A and B that have been drilled are quite different. Well A is a gas reservoir and well B is a reservoir. The hydrocarbon source, filling period and accumulation model of Wuyunting structure were analyzed by biomarker compound comparison, carbon isotope analysis and fluid inclusion analysis. It is believed that the Wuyunting structural oil is a normal mature crude oil, mainly derived from the local Ningbo 19 sub-sag, Pinghu Formation coal-series source rock. The upper part of Pinghu Formation is high-mature natural gas, mainly from the main source of the eastern main shoal of Ningbo 19 sub-sag, Pinghu Formation, and the middle section of Pinghu Formation. It is a normal mature natural gas, mainly derived from local source rocks. The fluorescence of the inclusions is light yellow oil and gas inclusions and colorless gas inclusions. The uniform temperature indicates that the Wuyunting structure mainly undergoes two phases of hydrocarbon charging, 2 Ma and nowadays. The Wuyunting structure is rich in oil and gas resources, and the accumulation process is complex. Based on the hydrocarbon supply mode and the transport system, it is divided into two accumulation models: "dual-source lateral late secondary type" and "single-source vertical transport late native type".
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Key words:
- Xihu Depression /
- hydrocarbon origin /
- organic inclusion /
- accumulation model
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图 1 西湖凹陷构造位置示意图(A)及武云亭构造位置图(B)(据文献[4]修改)
A.西湖凹陷构造区划; B.武云亭构造及断裂
Figure 1. Structural position of Xihu Depression (A) and location map of Wuyunting structure (B)
图 3 武云亭构造天然气成因划分(底图据文献[12])
Ⅰ.煤成气区; Ⅱ.油型气区; Ⅲ.碳同位素系列倒转混合气区; Ⅳ.煤成气和油型气区; Ⅴ.煤成气、油型气和混合气区; Ⅵ.生物气和亚生物气区
Figure 3. Genetic classification of natural gas in Wuyunting structure
图 5 武云亭构造Vandre天然气成熟度计算分布图(底图据文献[15])
Figure 5. Vandre natural gas maturity calculation distribution in Wuyunting structure
图 8 武云亭构造油-源生物标志特征
Figure 8. Crude oil and source rock biomarkers characteristic in Wuyunting structure
图 9 武云亭构造油-源生物标志参数交会图
Figure 9. Parameters of oil-source biomarker intersection in Wuyunting structure
图 11 武云亭构造正构烷烃摩尔浓度分布和碳数关系
Figure 11. Relationship between molar concentration of n-alkanes and its carbon number for the oils in Wuyunting structure
图 12 A井P8砂层，4 362 m储层残余重质油照片
Figure 12. Photo of P8 layer reservoir residual heavy oil in well A
图 13 武云亭构造储层流体包裹体显微照片
a.石英颗粒微裂隙中气相包裹体，透射光下呈灰色(无色)，A井P8砂层，4 384 m; b.石英颗粒微裂隙中气液两相包裹体，透射光下呈灰色(偏光)，A井P8砂层，4 384 m; c.石英颗粒裂纹中气液两相包裹体，呈蓝色荧光(UV激发荧光)，A井P8砂层，4 384 m
Figure 13. Photomicrograph of reservoir fluid inclusion in Wuyunting structure
图 14 武云亭构造流体包裹体均一温度分布
Figure 14. Uniform temperature distribution of reservoir fluid inclusion in Wuyunting structure
图 15 武云亭构造埋藏史与油气充注史
Figure 15. Burial history and hydrocarbon charging history of Wuyunting structure
图 16 武云亭油气成藏模式(剖面位置见图 1)
Figure 16. Hydrocarbon accumulation model in Wuyunting structure
表 1 武云亭构造天然气组分
Table 1. Natural gas components in Wuyunting structure
井 组段 砂层 组分摩尔分数/% C1 C2 C3 iC4 nC4 iC5 nC5 C6+ N2 CO2 A 平湖组中段 P8 84.40 7.05 2.60 0.54 0.55 0.19 0.14 0.28 0.12 4.13 P10 74.15 12.21 6.72 1.36 1.18 0.27 0.17 0.18 0.44 3.30 B 平湖组中段 P5 76.73 10.98 5.71 1.21 1.06 0.30 0.18 0.02 0.20 3.60 P8 76.30 9.74 6.14 1.83 1.27 0.44 0.24 0.02 0.48 3.53 
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表 2 武云亭构造天然气碳同位素
Table 2. Natural gas carbon isotope in Wuyunting structure
类型 井 组段 砂层 δ13C/‰ C1 C2 C3 nC4 气藏凝析气 A 平湖组中段 P8 -32.2 -24.9 -24.5 -25.5 P10 -36.9 -27.1 -25.1 -26.7 油藏溶解气 B 平湖组中段 P5 -36.5 -28.5 -25.9 -24.6 气藏凝析气 P8 -39.9 -29.5 -27.3 -26.2
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表 3 武云亭构造原油物性
Table 3. Physocal properties of crude oil in Wuyunting structure
原油类型 井 组段 砂层 密度/(g·cm-3) 气油比/(m3·m-3) 凝固点/℃ 运动黏度/(50℃mm2·s-1) 含硫量/% 含蜡量/% 气藏凝析油 A 平湖组中段 P8 0.836 7597 16 1.37 0.06 8.18 P10 0.795 1170 3 2.23 0.047 3.36 油藏黑油 B 平湖组上段 P4 0.869 110 18 4.95 0.078 13.2 P4 0.856 102 18 3.84 0.064 13.7 气藏凝析油 平湖组中段 P5 0.845 273 19 5.68 0.074 12.7 P8 0.775 2039 11 1.25 0.028 5.5
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表 4 武云亭构造油-源芳烃成熟度对比
Table 4. Oil-source aromatics maturity comparison in Wuyunting structure
井 组段 砂层 样品类型 4-MDBT/1-MDBT MPI1 计算Rc/% 实测Ro/% A 平湖组中段 P6 泥岩 4.60 0.54 0.72 0.72 P8 油 10.57 1.15 0.96 \ P10 油 8.48 1.01 0.91 \ B 平湖组中段 P8 煤 1.30 0.39 0.65 0.60 P8 泥岩 3.66 0.51 0.70 0.66 平湖组上段 P4 油 12.00 1.09 0.94 \ 平湖组中段 P5 油 8.01 1.03 0.91 \ 注：拟合关系：Rc=0.4×MPI1+0.5
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