Error Correction of Vapour/Liquid Ratio of Hydrocarbon Inclusions Measured by Confocal Laser Scanning Microscope
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摘要:
通过烃类包裹体PVT模拟可以重建捕获温度和捕获压力, 气液比是影响PVT模拟结果的重要参数, 然而由于缺少烃类包裹体标准样品, 一直未能深入研究激光共聚焦显微镜气液比测定精度的问题。本文利用人工合成包裹体技术合成了一种用于校正激光共聚焦扫描显微镜(LSCM)测定气液比的烃类包裹体标准样品, 根据已知的合成烃类包裹体的油气组成、捕获温度和捕获压力计算出烃类包裹体的理论气液比, 并利用LSCM测定烃类包裹体的实际气液比, 通过计算实际测试值与理论值的差值以分析实际测定气液比的误差, 实现对激光共聚焦扫描显微镜的误差标定。实验结果证实, 高分辨率的LSCM测定烃类包裹体气液比的绝对误差小于0.5%, 可以为包裹体PVT模拟提供精确参数。本研究肯定了LSCM测定烃类包裹体气液比方法的准确性, 进一步证实了烃类包裹体的PVT模拟结果可以为油气成藏研究提供可靠数据。
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关键词:
- 烃类包裹体标准样品合成 /
- 气液比 /
- PVT模拟 /
- 激光共聚焦扫描显微镜 /
- 误差校正
Abstract:PVT simulation of hydrocarbon inclusions can be used to reconstruct trapping temperature and pressure. Vapour/liquid ratio is an important parameter affecting PVT simulation. However, due to the lack of a hydrocarbon inclusion standard, the accuracy of the vapour/liquid ratio measured by Confocal Laser Scanning Microscope (CLSM) has not been investigated. In this paper it is proposed that a synthetic hydrocarbon inclusion standard can be used for correcting CLSM and the theoretical vapour/liquid ratio of hydrocarbon inclusions can be calculated based on the known hydrocarbon composition, trapping temperature and pressure. The actual vapour/liquid ratio can be obtained by CLSM. The differences between the actual values and theoretical values can be used to calculate the error of actual vapour/liquid ratio, so as to complete the error calibration of CLSM. Experimental results confirm that the absolute error of CLSM with high resolution is less than 0.5%, and thus CLSM can provide accurate parameters for the PVT simulation of inclusions. This study affirms the accuracy of CLSM for determining the vapour/liquid ratio of hydrocarbon inclusions, and further confirms that PVT simulation of hydrocarbon inclusions can provide reliable data for hydrocarbon accumulation.
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表 1 原油组成和含量
Table 1. The composition and content of crude oil
原油组成 含量(%) 原油组成 含量(%) 王102井 王斜731井 王102井 王斜731井 丙烷 0.001 0.001 正十九烷 3.417 3.141 异丁烷 0.008 0.005 正二十烷 3.555 3.674 正丁烷 0.100 0.021 正二十一烷 2.834 2.825 异戊烷 0.627 0.094 正二十二烷 3.395 3.478 正戊烷 1.139 0.109 正二十三烷 3.605 3.970 己烷 7.190 1.623 正二十四烷 3.534 4.068 苯 0.984 0.016 正二十五烷 2.677 3.310 正庚烷 6.503 2.552 正二十六烷 2.564 3.109 正辛烷 1.930 0.759 正二十七烷 1.916 2.609 正壬烷 2.010 1.025 正二十八烷 2.190 2.856 正葵烷 2.259 1.119 正二十九烷 1.680 2.434 正十一烷 2.390 1.305 正三十烷 1.983 3.500 正十二烷 2.326 1.531 正三十一烷 1.200 2.011 正十三烷 3.137 2.526 正三十二烷 1.047 1.459 正十四烷 3.437 2.975 正三十三烷 1.027 1.816 正十五烷 3.634 3.375 正三十四烷 0.625 0.934 正十六烷 3.880 3.504 正三十五烷 0.390 0.566 正十七烷 3.706 3.716 正三十六烷 0.305 0.445 姥鲛烷 3.330 4.999 正三十七烷 0.558 0.964 正十八烷 4.004 3.945 正三十八烷 0.311 0.628 植烷 8.594 17.004 表 2 烃类包裹体气液比的实验测试值与理论值比较
Table 2. A comparison of theoretical and actual vapour/liquid ratio of hydrocarbon inclusions
样品井名 实验测试值 理论计算值 气液比测试值与理论值的比较 气相直径
(μm)气相体积
(μm3)液相体积
(μm3)气液比
(%)20℃密度
(g/cm3)80℃密度
(g/cm3)气液比
(%)绝对误差
(%)相对误差
(%)王102 7.81 249.431 6015 4.15 0.7844 0.7498 4.41 0.26 5.89 王斜731 3.56 23.623 788.8 2.99 0.8105 0.7789 3.07 0.08 2.60 -
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