应用包裹体技术恢复气藏古压力

施伟军; 席斌斌

doi:10.11781/sysydz201601128

应用包裹体技术恢复气藏古压力

doi: 10.11781/sysydz201601128

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

基金项目: 中国石化科技部项目(P06002,P09058,P10027)资助。

详细信息

作者简介:
施伟军(1964-),女,高级工程师,从事油气包裹体实验技术开发和石油地质勘探研究。E-mail:shiwj.syky@sinopec.com。

中图分类号: TE122.3
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出版历程
- 收稿日期: 2015-04-15
- 修回日期: 2015-11-27
- 刊出日期: 2016-01-28

Calculation of paleo-pressure in gas reservoirs using fluid inclusions

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

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。
- 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
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.
- H₂O-NaCl-CH₄ 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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