Source and migration direction of oil and gas in Kongqueting area, Xihu Sag, East China Sea Shelf Basin
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摘要:
孔雀亭区是西湖凹陷油气勘探重点区带，油气来源及运移方向不清限制了勘探的进一步拓展。基于油气特征及分布研究，通过开展烃源岩及原油生物标志化合物特征对比分析、天然气成熟度计算，综合厘定了油气来源；结合油气运移效应分析明确了原油及天然气运移方向。结果表明，孔雀亭区原油主要来自平湖组下段和宝石组烃源岩，平湖组中段及上段少量贡献，原油自斜坡内生油次洼向高部位运移，是原油优势运聚方向；天然气具有斜坡带本地烃源岩及西次凹双重来源，以西次凹贡献为主，天然气自斜坡低带向高带侧向运移，并沿断层与斜坡带烃源岩自生天然气混合呈现垂向运移特征，斜坡低部位是天然气勘探有利区带。
Abstract:Kongqueting is a key exploration area in the Xihu sag of the East China Sea Shelf Basin. The ambiguity in source and migration direction of oil and gas has brought difficulties in efficient oil and gas exploration. This time, the source of oil and gas is jointly determined by the study of oil and gas characteristics and distribution patterns, the correlation of the biomarkers between source rocks and crude oil, and the calculation of the maturity of natural gas. In combination with the migration effect of oil and gas, the migration direction of crude oil and natural gas are discussed. The results suggest that the crude oil in Kongqueting area mainly comes from the source rocks of the Lower Pinghu Formation and Baoshi Formation, with a little from the Middle Pinghu Formation. Crude oil migrates mainly from the secondary depressions to the higher part of the slope for oil accumulation. In terms of natural gas, there are dual sources, one local source and one the source from the Western Subsag. The natural gas generated from the Western Subsag migrates from low zone to high zone along the slope, and mixed with natural gas generated by local source rock of the slope zone on the way, suggesting a pattern of vertical migration. Therefore, the low part of the slope is a potential area for natural gas exploration.
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Key words:
- source of oil and gas /
- oil and gas migration /
- Xihu Sag /
- Kongqueting area /
- East China Sea Shelf Basin
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表 1 西湖凹陷孔雀亭区原油物性统计
Table 1. Oil parameters from Kongqueting area
井名 深度/m 密度/ （g/cm3） 凝固点/℃ 硫含量/% 蜡含量/% G2 4150 0.8422 9 0.10 2.11 Z2 4107.5 0.8248 15 0.06 3.14 Z2 4186 0.8152 14 0.07 3.08 Z1 4183 0.8167 5 0.04 3.27 Z1 4548.7 0.8606 29 0.07 10.54 G1 3542.6 0.8345 14 0.04 17.91 G1 3565.6 0.8239 17 0.06 19.53 G1 3810.2 0.7487 −30 0.06 0.07 D2 3949 0.8380 −34 0 0 D2 4317.4 0.8443 12 0.04 9.50 D2 4333 0.8390 −32 0.07 0 G3 2647 0.8315 5 0.02 12.00 G3 3099 0.8105 −1 0.01 7.70 
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表 2 西湖凹陷孔雀亭区天然气组分及同位素统计
Table 2. Natural gas parameters from Kongqueting area
井号 深度/m 组分/% 同位素/‰ iC4H10/nC4H10 N2/C2H6 成熟度% CH4 C2H6 C3H8 iC4H10 nC4H10 iC5H12 nC5H12 N2 CO2 CH4 C2H6 C3H8 C4H10 G1 3542 83.52 7.61 2.42 0.49 0.37 0.11 0.04 2.98 2.45 − − − − 1.32 0.39 − G1 3565 79.03 8.68 3.54 0.96 0.58 0.23 0.07 4.19 2.72 − − − − 1.66 0.48 − G1 3810 75.96 10.33 5.70 1.80 0.70 0.25 0.12 1.70 3.40 − − − − 2.57 0.16 − G2 4150 89.1 4.48 0.63 0.16 0.10 0.05 0.03 0.36 5.00 −37.1 −22.7 −20.8 −21.7 1.60 0.08 0.79 G4 4093 79.43 8.38 2.84 1.04 0.65 0.28 0.20 0.59 6.29 −34.6 −25.3 −24.5 −25.4 1.60 0.07 1.02 Z2 4111 81.02 7.35 3.03 0.74 0.64 0.22 0.16 0.45 6.19 −37.8 −27.2 −25.4 −24.6 1.16 0.06 0.73 Z2 4186 81.42 7.29 2.97 0.72 0.62 0.22 0.16 0.18 6.19 −28.2 −23.8 −23.7 −23.3 1.16 0.02 1.97 Z1 4183 85.51 6.28 2.30 0.59 0.51 0.18 0.13 0.20 4.11 −35.4 −25.7 −24.4 −24.8 1.16 0.03 0.94 Z1 4548 73.20 8.43 5.83 1.68 1.40 0.49 0.31 0.57 7.79 −37.7 −27.6 −26.3 −26.2 1.20 0.07 0.74 D1 4198 89.82 5.51 1.66 0.44 0.33 0.14 0.09 0 1.99 −33.4 −26.3 −24.3 −23.1 1.32 0 1.16 D1 4810 92.05 5.38 1.51 0.36 0.36 0.17 0.12 0.02 0 −33.6 −28.4 −27.1 −22.7 1.01 0 1.14
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表 3 孔雀亭区烃源岩与原油生标参数统计
Table 3. Biomarker of source rock and oil from Kongqueting area
样品类型 甾烷C27/
C29ααα20RTs/Tm 伽马蜡烷/
C30藿烷C29/C30
藿烷C29重排甾
烷/C29规
则甾烷C24四环萜/
C23三环萜C29甾烷ββ/
（αα+ββ）C29甾烷20S/20
（R+S）C31藿烷S/
（S+R）运移效应 烃源岩 平上段 0.79(14)
0.25～2.010.96(13)
0.01～2.660.18(13)
0.01～0.830.7(12)
0.26～2.170.12(14)
0.01～0.240.75(6)
0.24～1.500.39(14)
0.25～0.500.38(14)
0.17～0.500.53(14)
0.36～0.57— 平中段 0.24(16)
0.01～0.540.37(16)
0.05～1.490.07(16)
0.01～0.200.78(16)
0.46～1.220.18(16)
0.12～0.260.95(13)
0.36～3.440.36(16)
0.24～0.530.42(16)
0.28～0.490.56(16)
0.52～0.59— 平下段 0.39(4)
0.15～0.710.33(4)
0.15～0.560.05(2)
0.09～0.100.65(4)
0.61～0.690.16(4)
0.12～0.211.03(2)
0.43～1.680.45(4)
0.43～0.480.46(4)
0.45～0.470.56(4)
0.54～0.57— 宝石组 0.83(2)
0.70～0.950.82(2)
0.76～0.880.14(2)
0.12～0.150.56(2)
0.55～0.570.19(2)
0.19～0.200.25(2)
0.27～0.240.43(2)
0.42～0.430.45(2)
0.46～0.440.5(2)
0.48～0.52— 原油 G2 — 0.31(1) 0.08(1) 0.62(1) — — — — 0.53(1) — Z2 0.91(2)
0.89～0.941.16(2)
1.16～1.160.08(2)
0.08～0.080.63(2)
0.61～0.650.17(2)
0.16～0.17— 0.56(2)
0.56～0.560.45(2)
0.44～0.460.55(2)
0.55～0.5526.19(2)
23.22～29.31Z1 0.65(2)
0.54～0.770.86(2)
0.77～0.940.08(2)
0.07～0.090.61(2)
0.55～0.670.17(2)
0.16～0.18— 0.55(2)
0.54～0.560.44(2)
0.44～0.450.55(2)
0.54～0.5624.05(2)
21.53～26.62D2 0.67(2)
0.65～0.690.51(2)
0.49～0.530.21(2)
0.21～0.210.68(2)
0.66～0.700.13(2)
0.12～0.130.21(2)
0.21～0.210.41(2)
0.39～0.420.41(2)
0.40～0.420.53(2)
0.53～0.54～0.59(2)
～1.89～0.64G3 0.74(3)
0.67～0.850.52(3)
0.36～0.700.08(3)
0.05～0.110.60(3)
0.55～0.650.21(3)
0.21～0.220.27(3)
0.15～0.500.53(3)
0.52～0.540.47(3)
0.45～0.490.56(3)
0.55～0.5611.39(3)
8.14～21.03注：运移效应=参数(C29甾烷ββ/(αα+ββ)−C29甾烷20S/20(R+S))×100/ C29甾烷20S/20(R+S)；数据格式: 平均值(样品数量)/最小值-最大值。
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