Individual Oil Inclusion Composition Prediction and Its Application in Oil and Gas Accumulation Studies
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摘要: 了解单个石油包裹体详细的组分信息不仅有助于微观上定量认识油气充注过程中其成熟度的演化,还对精细刻画油气成藏过程中动力演化具有重要意义.根据石油包裹体热动力学原理,利用10个成熟度依次增大的已知组分的原油在匹配其饱和压力和改进气、液相摩尔体积计算前提下,建立了捕获不同组分原油的包裹体均一温度(Thoil)与其在室温下(20 ℃)气泡充填度(Fv)关系的标准图版,从而通过对比实测的Thoil和其室温下Fv与标准Thoil-Fv图版,反推出油包裹体近似等效流体组分.对东营凹陷北带民丰深层油包裹体进行系统荧光分析、显微测温和包裹体体积3D重构等一系列的测定.结果表明丰8井和丰深1井各发生过两幕油气充注,其中丰8井第一幕油气充注(甲烷摩尔含量位于31%~35%之间)对其油气成藏贡献最大;而丰深1井第二幕充注的油气(甲烷摩尔含量大于60%)控制丰深1井凝析油藏成藏.从而为进一步厘定北带深层油气充注PVTxt史奠定基础.Abstract: The composition information of individual oil inclusion is not only important for quantitatively understanding the maturity evolution of petroleum during the petroleum charging, but also significant for the precise depiction of the dynamic evolution during petroleum accumulation. However, it is very difficult to obtain the detailed composition of individual petroleum inclusion directly by experimental methods. Petroleum inclusions thermodynamics method is an easy and fast indirect method for obtaining the individual petroleum inclusion composition which has been well developed in last ten years. Ten oil composition data with different maturity are used to build the standard relation diagram of oil inclusions homogenization temperature (Thoil) and the degree of gaseous filling (Fv) at room temperature (20 ℃) using petroleum inclusions thermodynamics method on condition that firstly, match the saturation pressure and improvement of the gas and liquid mole volume calculations, then the equivalent composition can be determined by comparing the measured homogenization temperature and the degree of gaseous filling at room temperature (20 ℃) with the standard Thoil-Fv diagram. The compositions of petroleum inclusions with different maturity are quantified by a series of measurements on oil inclusions in the deeply buried reservoir in Minfeng area in North Dongying depression including fluorescence analysis, microthermometry and 3D reconstruction of the oil inclusions volume. The results show that both of the well Feng 8 and well Fengshen 1 happened two episodes of petroleum charging events. The first episode oil charging whose methane mole percent content is between 31%-35% contributed to the petroleum accumulation of well Feng 8, and the second episode oil whose methane mole percent content is more than 60% controlled the gas condensate accumulation of well Fengshen 1. The composition prediction results facilitates further establishing the oil and gas charging PVTxt history in the deeply buried reservoir in Minfeng area in North Dongying depression.
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Key words:
- inclusions /
- homogenization temperature /
- thermodynamics /
- Dongying depression /
- petroleum geology
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图 1 石油包裹体组分预测原理示意(据Bourdet et al., 2008修改)
a.黑油的P-T相图及5个不同的等容路径(Th1、Th2、Th3、Th4和Th5)和所对应的室温下(20 ℃)气/液相体积比(Fv1、Fv2、Fv3、Fv4和Fv5);b.虚拟的黑油包裹体不同均一温度与室温下(20 ℃)气泡充填度(Fv)关系
Fig. 1. The schematic diagram of petroleum inclusion composition prediction
图 2 东营凹陷北带民丰地区丰8井和丰深1井石油包裹体荧光照片
a,a'和e'为透射光,其他为荧光.丰8井,3 943.0 m,泥岩裂缝充填方解石脉中见大量淡黄-白色荧光油包裹体(a~d);丰8井,4 195.12 m,石英颗粒加大边中见大量淡黄-白色荧光油包裹体(e~f);丰深1井,4 321.7 m,在穿石英颗粒裂纹中见大量淡黄色荧光油包裹体(a'~b')、蓝白色荧光油包裹体(c'~d')及富气相蓝色荧光凝析油包裹体(e'~f')
Fig. 2. Photomicrographs of petroleum inclusions from well Feng 8 and well Fengshen 1 in Minfeng area in North Dongying depression
表 1 用于石油包裹体热动力学计算的最初流体组分
Table 1. The untuned crude oil composition using for petroleum inclusions thermodynamics
No. F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 N2 0.24 0.29 0.25 0.53 0.00 0.00 0.41 0.32 0.74 1.67 CO2 0.39 0.46 2.19 0.12 2.13 0.77 0.44 2.80 2.01 2.18 H2S 0.00 0.49 1.16 0.00 0.00 0.00 0.00 1.49 0.00 0.00 C1 5.82 10.75 16.33 22.80 31.28 36.20 40.48 45.29 51.30 60.51 C2 0.84 1.11 6.29 6.45 7.51 9.74 7.74 9.11 10.67 7.52 C3 0.43 1.58 7.48 8.51 6.93 6.75 8.20 5.50 7.12 4.74 C4 1.14 3.68 6.09 6.60 6.26 4.96 5.45 4.13 3.61 4.12 C5 3.01 4.03 4.36 4.71 4.74 3.89 3.64 3.06 2.20 2.97 C6 4.92 4.75 3.58 4.24 4.37 3.29 2.83 2.38 1.83 0.00 C7+ 83.20 72.86 52.27 46.04 36.78 34.40 31.42 25.92 20.52 16.29 GR.C7+ 942.00 861.00 880.00 864.00 851.05 849.18 845.00 838.06 805.00 789.00 MW.C7+ 304.00 261.00 249.00 242.00 232.88 216.89 210.00 215.89 192.35 181.00 注:F1据Elsharkawy(2003);F2和F4据Wu and Rosenegger(1999);F3据Moharam and Fahim(1995);F5、F6和F8据 Jaubert et al.(2002) ;F7据Pedersen et al.(1988) ;F9据Neau et al.(1993) ;F10据Jacopy and Berry(1958).GR.C7+为C7+组分比重;MW.C7+为C7+组分分子量(kg/mol).表 2 用于石油包裹体热动力学计算的调整后的流体组分
Table 2. The tuned crude oil composition using for petroleum inclusions thermodynamics
No. F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 N2 0.23 0.29 0.25 0.53 0.00 0.00 0.41 0.32 0.74 1.66 CO2 0.37 0.46 2.21 0.12 2.12 0.77 0.44 2.83 2.02 2.17 H2S 0.00 0.49 1.17 0.00 0.00 0.00 0.00 1.51 0.00 0.00 C1 5.55 10.74 16.46 22.76 31.14 35.84 40.33 45.80 51.53 60.13 C2 0.80 1.11 6.34 6.44 7.48 9.64 7.71 9.21 10.72 7.47 C3 0.41 1.58 7.54 8.49 6.90 6.68 8.17 5.56 7.15 4.71 C4 1.09 3.68 6.14 6.59 6.23 4.91 5.43 4.18 3.63 4.09 C5 2.87 4.03 4.40 4.70 4.72 3.86 3.63 3.09 2.21 2.95 C6 4.69 4.75 3.61 4.23 4.35 3.26 2.82 2.41 1.84 0.00 C7+ 83.99 72.89 51.89 46.14 37.06 35.05 31.07 25.08 20.16 16.81 GR.C7+ 898.06 860.15 887.08 862.36 847.33 840.70 846.96 847.55 808.64 784.09 MW.C7+ 287.12 260.65 252.86 241.01 230.14 210.71 211.57 225.64 196.66 174.30 表 3 表 1中流体匹配饱和压力后的组分变化
Table 3. The composition change of petroleum fluids in table 1 after match of the saturation pressure
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 AAD% AD% N2 4.17 - 0.00 - - - - - - 0.60 1.59 CO2 5.13 - 0.91 - 0.47 - - 1.07 0.50 0.46 1.42 H2S - - 0.86 - - - - 1.34 - - - C1 4.64 0.09 0.80 0.18 0.45 0.99 0.37 1.13 0.45 0.63 0.97 C2 4.76 0.00 0.79 0.16 0.40 1.03 0.39 1.10 0.47 0.66 0.98 C3 4.65 0.00 0.80 0.24 0.43 1.04 0.37 1.09 0.42 0.63 0.97 C4 4.39 0.00 0.82 0.15 0.48 1.01 0.37 1.21 0.55 0.73 0.97 C5 4.65 0.00 0.92 0.21 0.42 0.77 0.27 0.98 0.45 0.67 0.94 C6 4.67 0.00 0.84 0.24 0.46 0.91 0.35 1.26 0.55 - 1.03 C7+ 0.95 0.04 0.73 0.22 0.76 1.89 1.11 3.24 1.75 3.19 1.39 GR.C7+ 4.66 0.10 0.80 0.19 0.44 1.00 0.23 1.13 0.45 0.62 0.96 MW.C7+ 5.55 0.13 1.55 0.41 1.18 2.85 0.75 4.52 2.24 3.70 2.29 注:$ AD = \left| {\frac{{{x^{{\rm{tun}}}} - {x^{{\rm{exp}}}}}}{{{x^{\exp }}}}} \right|;AAD = \frac{1}{N}\sum\limits_{i = 1}^N {\left| {\frac{{{x^{{\rm{tun}}}} - {x^{{\rm{exp}}}}}}{{{x^{\exp }}}}} \right|} $,其中xexp和xtun分为调整前和调整后的组分或者分子量和密度,N为个数. 表 4 根据表 2中调整后组分计算的石油包裹体不同均一温度对应室温下(20 ℃)气泡充填度值(Fv)
Table 4. The degree of gaseous filling (Fv) under room temperature (20 ℃) calculated according to the tuned fluid composition shown in table 2 under different homogenization temperatures of petroleum inclusion
No. F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 Thoil(℃) Fv (20 ℃) (%) 20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 30 0.21 0.38 0.58 0.68 0.96 1.20 1.42 1.93 3.15 6.05 40 0.63 0.85 1.21 1.45 1.98 2.40 2.80 3.75 5.96 10.39 50 0.97 1.25 1.84 2.23 2.95 3.61 4.22 5.47 8.47 13.97 60 1.29 1.77 2.49 3.03 4.02 4.85 5.65 7.09 10.82 16.95 70 1.79 2.30 3.16 3.78 5.03 6.06 7.01 8.66 12.97 19.71 80 2.13 2.71 3.84 4.64 6.13 7.37 8.43 10.20 14.97 22.19 90 2.49 3.27 4.65 5.51 7.18 8.64 9.83 11.67 16.91 24.61 100 3.24 3.85 5.37 6.42 8.33 9.93 11.22 13.08 18.74 26.95 110 3.43 4.44 6.11 7.26 9.43 11.26 12.60 14.48 20.56 29.01 120 3.82 5.05 6.87 8.24 10.63 12.54 14.01 15.82 22.35 31.13 130 4.43 5.68 7.78 9.14 11.78 13.93 15.41 17.18 24.04 33.39 140 4.85 6.36 8.58 10.15 12.94 15.27 16.84 18.57 25.76 35.67 150 5.35 7.03 9.40 11.19 14.22 16.64 18.26 19.95 27.50 37.89 160 5.81 7.72 10.37 12.17 15.45 18.06 19.70 21.27 29.25 40.11 170 6.52 8.43 11.23 13.27 16.69 19.48 21.12 22.66 30.98 42.33 180 7.05 9.16 12.25 14.40 17.96 20.94 22.56 24.05 32.71 44.55 190 7.56 9.91 13.15 15.45 19.25 22.34 23.98 25.41 34.44 46.77 200 8.35 10.68 14.22 16.64 20.56 23.85 25.42 26.78 36.17 48.99 表 5 东营凹陷北带深层油包裹体均一温度(Thoil)与室温下(20 ℃)气泡充填度(Fv)数据
Table 5. The data of homogenization temperature (Thoil) and the degree of gaseous filling (Fv) under room temperature (20 ℃) of petroleum inclusions in the deep reservoir in North Dongying depression
包裹体编号 井号 深度(m) 产状 成因 荧光颜色 API° Thoil Fv(%) Thaqu 幕次 包裹体类型 1 丰8 3 943.0 方解石脉 原生 淡黄-白色 33.8 47.5 3.1 134.3 第一幕 油 2 丰8 3 943.0 方解石脉 原生 淡黄-白色 36.1 76.0 6.2 145.9 第一幕 油 3 丰8 4 195.1 石英加大边 原生 淡黄-白色 37.3 102.5 10.5 156.7 第一幕 油 4 丰深1 4 321.7 穿石英颗粒裂纹 次生 淡黄色 38.7 128.6 16.9 151.6 第一幕 油 5 丰深1 4 321.7 穿石英颗粒裂纹 次生 蓝白色 42.4 139.3 25.6 156.7 第一幕 油 6 丰深1 4 321.7 穿石英颗粒裂纹 次生 蓝色 49.0 150.3 72.5 178.7 第二幕 凝析油 7 丰深1 4 321.7 穿石英颗粒裂纹 次生 不发荧光 161.0~176.0 第三幕 天然气 -
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