| 应用包裹体技术恢复气藏古压力 |
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| 引用本文： | 施伟军, 席斌斌. 应用包裹体技术恢复气藏古压力[J]. 石油实验地质, 2016, 38(1): 128-134. doi: 10.11781/sysydz201601128 |
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| 作者姓名： | 施伟军 席斌斌 |
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| 作者单位： | 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126 |
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| 基金项目： | 中国石化科技部项目(P06002,P09058,P10027)资助。 |
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| 摘 要： | 包裹体捕获时的温度和压力反映了油气藏形成时的古温度和古压力,是油气成藏过程研究的一个重要依据。富(CH4)气盐水包裹体是气藏中最主要的一种包裹体类型,对这类包裹体捕获温度和压力的恢复最大的技术难点是其中气体(CH4)含量的精确测定。通过建立CH4气体拉曼位移值与包裹体内压的相关曲线,根据包裹体总体积和成分保持恒定的原则构建迭代计算模型,可快速准确计算出含CH4盐水包裹体的捕获压力。该方法应用于川南隆32井中奥陶统宝塔组微晶灰岩中的包裹体古压力研究,计算结果显示包裹体的捕获压力为884.08~1249.32 bar,压力系数约为1.3~1.8,证明了包裹体捕获时地层流体为超压状态。
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| 关 键 词： | 含CH4盐水包裹体 包裹体内压 拉曼位移 均一温度 捕获压力 拉曼位移-密度迭代法 气藏古压力 |
| 收稿时间： | 2015-04-15 |
| 修稿时间： | 2015-11-27 |
Calculation of paleo-pressure in gas reservoirs using fluid inclusions |
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| Shi Weijun, Xi Binbin. Calculation of paleo-pressure in gas reservoirs using fluid inclusions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(1): 128-134. doi: 10.11781/sysydz201601128 |
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| Authors: | Shi Weijun Xi Binbin |
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| Affiliation: | Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China |
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| Abstract: | Trapping pressure and trapping temperature of fluid inclusions are important information for the research of petroleum charge history which represents the paleo-pressure and paleo-temperature of gas-oil reservoirs. Gas-bearing (e.g., CH4) inclusions are common in gas reservoirs. The difficulty for the determination of trapping pressure and temperature of inclusions is to accurately measure the concentration of methane. We propose a feasible and credible way to calculate inclusion trapping pressures by using an iteration calculation model based on the hypothesis of constant total volume and composition of intact inclusions and correlation curves of inclusion pressure at room temperature and the Raman shift of methane gas. The method was applied to paleo-pressure of fluid inclusions trapped in the Baota Formation limestones in well Long32 in the southern Sichuan. Results indicated that the trapping pressure is in the range of 884.08-1249.32 bar, which is an overpressure circumstance at a pressure factor of 1.3-1.8. |
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| Keywords: | H2< sub>O-NaCl-CH4< sub> inclusion inclusion pressure at room temperature Raman shift homogenization temperature trapping pressure Raman shift-density iteration method paleo-pressure of gas reservoirs |
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