THE FLUID INCLUSION PALEO PRESSURE CHARACTERISTICS AND GEOLOGICAL IMPLICATIONS OF GAOTAIZI TIGHT RESERVOIR IN QIJIA AREA OF SONGLIAO BASIN
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摘要: 流体包裹体热动力学（PVTx）模拟应用包裹体组分、均一温度和气液比，结合模拟软件可以恢复包裹体被捕获时的古流体压力，以松辽盆地齐家地区高台子致密油层为例，应用激光共聚焦扫描显微镜、显微荧光和显微测温等分析，划分了油气充注幕次并恢复了各幕次流体古压力，该应用有效区分了不同幕次流体古压力特征。研究结果表明：齐家地区高台子油层存在两期油气充注，第1期发生在晚白垩世嫩江晚期（79~75 Ma），主要充注发黄色荧光的原油，古流体压力为16.13~16.97 MPa；第2期发生在晚白垩世明水期（69~65 Ma），主要充注发黄绿色、蓝绿色荧光颜色的原油，古流体压力为22.14~26.13 MPa。研究结果有助于深化勘探区油气成藏规律的认识。Abstract: PVTx thermal dynamics simulation of reservoir fluid inclusions has been applied to restore trapping pressures by inclusion component, homogenization temperature and gas liquid ratio combined with simulation software. In Gaotaizi tight reservoir in Qijia area of Songliao Basin, the hydrocarbon charging events and the paleo fluid pressure are divided by CLSM, fluorescence microscopy and micro-thermometry, through which characteristics of different events of paleo fluid pressure are distinguished. The results indicate two stages of hydrocarbon charging in Qijia Area. The first charging occurred in upper Cretaceous Nenjiang late stage(79~75 Ma), with yellow fluorescence color. The second charging occurred in upper Cretaceous Mingshui stage(79~75 Ma), with yellow-green and blue-green fluorescence color. The paleo fluid pressures of two stages respectively are 16.13~16.97 MPa and 22.14~26.13 MPa.All the research findings are of great help to deepen the understanding of hydrocarbon accumulation patterns of the exploration area.
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Key words:
- fluid inclusion /
- PVTx simulation /
- paleo pressure /
- Qijia area /
- Gaotaizi reservoir
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表 1 齐家地区高台子油层油包裹体荧光参数
Table 1. The fluorescence parameters of oil inclusions in Gaotaizi reservoir in Qijia Area
烃类包裹体 荧光颜色 λmax/nm Q QF535 油包裹体 黄色 580.9~585.4 1.17~1.40 2.45~2.92 油包裹体 黄绿 520.6~545.4 0.37~0.77 1.25~1.77 油包裹体 蓝绿 489.3~519.7 0.12~0.50 0.50~1.24 
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表 2 共聚焦扫描显微镜精确测定的部分油包裹体气液比
Table 2. The gas-liquid ratios of part of the fluid inclusions by CLSM
井号 深度/m 层位 岩性 总体积/um3 气泡体/um3 气液比/% 齐平1 1952.69 高台子 粉砂岩 552.71 19.72 3.7 齐平1 1952.69 高台子 粉砂岩 651.25 47.12 7.8 齐平1 2071 高台子 粉砂岩 698.14 41.38 6.3 齐平1 2071 高台子 粉砂岩 889.56 40.74 4.8 金23 2205.3 高台子 细砂岩 519.56 27.55 5.6 金23 2205.3 高台子 细砂岩 700.74 39.67 6 英X53 2078 高台子 粉砂岩 1058.44 61.79 6.2 英X53 2078 高台子 粉砂岩 587.39 35.85 6.5 古94 2193.6 高台子 粉砂岩 696.48 40.04 6.1 古94 2193.6 高台子 粉砂岩 540.15 37.22 7.4 古94 2198.5 高台子 粉砂岩 575.14 39.13 7.4 金191 1839.7 高台子 细砂岩 758.13 40.20 5.6 金191 1854.5 高台子 粉砂岩 368.86 18.90 5.4 金34 2125 高台子 粉砂岩 324.02 22.61 7.5 金34 2135 高台子 粉砂岩 532.01 37.12 7.5 龙201 1935.07 高台子 粉砂岩 404.88 21.83 5.7 金28 2217.4 高台子 粉砂岩 528.13 28.48 5.7
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表 3 模拟过程中原油样品成分组成表
Table 3. The Composition of crude oil sample in simulation
组分 摩尔组成百分比/% 组分 摩尔组成百分比/% CO2 0.84 n-C5 3.920 N2 0 C6 1.760 C1 26.570 C7 4.257 C2 10.740 C8 3.790 C3 9.270 C9 3.375 i-C4 0.520 C10 5.680 n-C4 6.300 C11+ 21.718 i-C5 1.260 — —
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表 4 齐家地区高台子油层部分流体包裹体组合PVTx模拟参数和结果
Table 4. The PVTx simulation parameters and results of part fluid inclusion assemblages in Gaotaizi reservoir in Qijia Area
井号 层位 深度/m 第1幕 第2幕 第3幕 G/L/% Tho/Tha P/MPa Pc G/L/% Tho/Tha P/MPa Pc G/L/% Tho/Tha P/MPa Pc 齐平1 高台子 1952.69 3.7 68.2/86.3 16.97 1.29 7.8 89.5/101.0 23.86 1.28 齐平1 高台子 2071 6.3 85.9/107.1 24.75 1.37 4.8 95.7/133.4 24.02 1.33 金28 高台子 2205.3 5.6 80.6/106.2 25.54 1.34 6 105.3/137.3 24.93 1.35 英x58 高台子 2078 6.2 86.2/107.4 24.38 1.28 6.5 104.3/131.4 24.89 1.31 古94 高台子 2193.6 6.1 84.5/107.8 25.35 1.27 7.4 107.8/129.2 24.91 1.03 金191 高台子 1839.7 5.6 85.8/107.5 22.59 1.28 金34 高台子 2125 7.5 88.1/102.4 24.59 1.37 龙201 高台子 1935.07 3.2 62.7/81.5 16.13 1.21 金191 高台子 1854.5 5.2 82.1/106.1 22.94 1.31 古94 高台子 2198.50 7.4 104.0/127.9 25.98 1.26 金34 高台子 2135.0 7.5 79.3/107.0 24.96 1.30 金28 高台子 2217.40 5.7 102.0/137.9 26.13 1.25 注:G/L—气液比; Tho/Tha—油包裹体/同期盐水包裹体均一温度; Pc—古压力系数计算值; P—热动力学模拟获得的古压力
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