PALEO-PRESSURE RESTORATION AND DYNAMIC MECHANISM FOR HYDROCARBON MIGRATION AND ACCUMULATION OF Es3 MEMBER IN NORTH DONGPU SAG
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摘要: 综合应用流体包裹体法和盆地模拟法, 恢复了东濮凹陷北部沙三段古压力, 并分析了成藏期油气运聚动力构成。研究结果表明, 沙三段超压分布受构造格局、沉降中心、生烃中心控制明显, 超压幅度表现为洼陷区大、中央隆起带次之、西部斜坡带最小, 受盐岩层发育影响, 濮卫-文留地区盐岩下部层系表现为压力系数高值区。成藏期超压和浮力是研究区沙三段油气运聚的主要动力, 压力过渡带和正常压力带是油气的主要聚集场所。研究区主要存在超压驱动、超压-浮力联合驱动和浮力驱动等3种类型的驱动机制, 其中斜坡带和洼陷带等超压带主要为超压驱动, 部分中央隆起带上的压力过渡带为超压-浮力联合驱动, 西部斜坡带和部分中央隆起带等正常压力带主要为浮力驱动。Abstract: With the application of fluid inclusions and basin simulation method, we restored the paleo-formation pressure of the third member of Shahejie formation (Es3) in North Dongpu sag, and analyzed the dynamic mechanism for hydrocarbon migration and accumulation. The results showed as follows:The formation pressure of Es3 during accumulation period was mainly controlled by the structural framework and the centers of subsidence and hydrocarbon generation, and the overpressure amplitude was largest in the sub-sag area with relatively larger in the central uplift belt and smallest in the west slope area. Controlled by the salt layer, the residual pressure of the lower formation was relatively high in Puwei and Wenliu. The overpressure and buoyancy were the main driving forces for the hydrocarbon accumulation of Es3, and the normal pressure zone and transitional zone were the main hydrocarbon accumulation places. There are three types of dynamic mechanism for hydrocarbon migration and accumulation in the study area including overpressure drive, overpressure-buoyancy drive and buoyancy drive. Overpressure zone including the slope zone and the sub-sag zone is mainly overpressure driven. Overpressure transition zone including part of the central uplift belt is mainly overpressure-buoyancy driven. And normal pressure zone including the west slop and part of the central uplift belt is mainly buoyancy driven.
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Key words:
- fluid inclusion /
- basin simulation /
- paleo-pressure restoration /
- dynamical mechanism /
- Dongpu sag
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图 1 东濮凹陷构造单元划分及油气分布
Figure 1. Structural units and oil and gas distribution of Dongpu sag
图 2 根据包裹体均一温度确定成藏期
Figure 2. The determination of accumulation period by homogenization temperature of fluid inclusions
图 3 流体包裹体计算压力进行过程约束校正示意图
Figure 3. Schematic diagram of the processing correction subject to the pressure calculated by fluid inclusions constraints
图 4 现今实测压力进行最终约束校正示意图
Figure 4. Schematic diagram of the final correction subject to the present measured pressure constraints
图 6 东濮凹陷北部地区地层压力演化曲线
Figure 6. The evolution of formation pressure in North Dongpu sag
图 7 沙三段压力系数与油气分布叠合图
Figure 7. The ouerlay of pressure coefficient and hydrocarbon distribution in Es3 member
图 8 胡78井—前2井剩余压力、油气分布及油气运聚动力构成关系
Figure 8. The relationship of residual pressure, oil-gas distribution and dynamic mechanism for oil-gas migration and accumulation from Well Hu78 to Well Qian2
表 1 东濮凹陷北部地区盐水包裹体古压力部分代表性计算结果
Table 1. The representative computation results of paleo-pressure of salt water inclusions in North Dongpu sag
构造位置 井号 现今埋深/m 层位 均一温度/℃ 含盐度/% 盐水溶液密度/(g·cm-3) 捕获温度/℃ 捕获压力/MPa 古埋深/m 古剩余压力/MPa 古压力系数 卫城 卫气1 2561 Es3上 125.9 14.57 1.04 140.9 41.33 2916 13.31 1.42 2658 116.8 5.11 0.98 131.8 39.30 2670 12.16 1.47 文96 2599 Es3上 108.2 23.05 1.12 123.2 45.11 2100 22.06 1.96 107.5 23.18 1.12 122.5 45.18 2080 22.35 1.98 文东 3443 Es3上 133.2 18.47 1.06 148.2 42.31 2730 13.95 1.49 134.5 15.57 1.04 149.5 41.17 2800 12.63 1.44 文13-85 134.6 2.41 0.95 149.6 37.06 2810 10.90 1.41 3442 Es3上 133.8 5.56 0.97 148.8 38.00 2800 11.38 1.42 134.3 5.11 0.97 149.3 37.83 2790 11.31 1.43 123.6 5.56 0.98 138.6 38.84 2900 10.99 1.37 文中 文95-17 2877 Es3中 124.3 7.02 0.99 139.3 39.18 2965 10.41 1.36 125.1 6.88 0.99 140.1 39.07 3025 6.07 1.33 文210 3920 Es3中 132.3 4.80 0.97 147.3 37.91 3089 7.95 1.27 文153 3779 Es3中 127.3 3.87 0.97 142.3 38.08 2980 9.75 1.35 文西 129.8 21.89 1.10 144.8 43.81 3020 11.25 1.35 文244 3483 Es3中 144.4 16.24 1.04 159.4 40.88 3416 5.39 1.15 141.5 15.27 1.03 156.5 40.66 2715 13.25 1.48 143.2 17.43 1.05 158.2 41.41 2785 12.75 1.45 东部洼陷 濮深4 3703 Es3上 141.7 15.07 1.03 156.7 40.58 2720 13.12 1.47 145.6 19.84 1.07 160.6 42.3 2806 12.88 1.44 143.5 18.04 1.05 158.5 41.64 2787 12.96 1.45 
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