深层致密砂岩微观孔喉结构对气水相渗的控制机理
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1.中国石油塔里木油田公司;2.中国石油勘探开发研究院;3.西安石油大学地球科学与工程学院;4.中国地质大学北京

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TE122

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盆地构造与油气成藏重点实验室开放课题(2023-KFKT-06);中石油塔里木油田科研项目(041021090128);中石油创新基金(2022DQ02-0202)


Control mechanism of micro-pore throat structure of deep tight sandstone on gas-water relative permeability curves
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Petrochina Tarim Oilfield Company

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    摘要:

    深层致密砂岩储层的孔隙结构复杂、非均质性强,孔隙微观参数对气水相渗特征的影响因素难以确定。本文以分形几何理论为基础,结合岩心压汞法、核磁共振T2谱测试及微米CT扫描结果获取了储层微观孔喉参数及各尺度分形维数,通过可动气体孔隙度和最大气相相对渗透率,讨论了分形维数、微观孔喉结构参数对气水相渗特征的控制机理。结果表明,压汞和核磁共振分形曲线具有明显的“三段式”特征,且储层总分形维数描述气水共存时渗流及可动流体分布状况更精细;最大进汞饱和度、平均孔喉半径、储层总分形维数及排驱压力对气体渗流时的可动气体孔隙度影响较为显著;平均孔喉半径对气体渗流时的最大有效气相相对渗透率影响较为显著。在明确微观孔喉结构对气水相渗的控制机理后,可以为产水气藏高效开发提供有力指导。

    Abstract:

    The pore structure of deep tight sandstone reservoir is complex and heterogeneous, and it is difficult to determine the influencing factors of pore microscopic parameters on the characteristics of gas-water phase permeability. In this paper, based on the fractal geometry theory, combined with the core Mercury intrusion porosimetry (MIP) method, nuclear magnetic resonance (NMR) T2 spectroscopy test and micron CT scanning results, the micro-pore throat parameters and various scale fractal dimensions of the reservoir are obtained. Through the mobile gas porosity and the maximum atmospheric phase relative permeability, the control mechanism of the fractal dimension and micro-pore throat structure parameters on the gas-water phase permeability characteristics is discussed. The results show that mercury injection and NMR fractal curves have obvious "three-stage" characteristics, and the total shape dimension of the reservoir describes the distribution of seepage and movable fluid more accurately when gas and water coexist. The maximum mercury saturation, average pore throat radius, total reservoir shape dimension and displacement pressure have significant effects on the mobile gas porosity during gas seepage. The average pore throat radius has a significant influence on the maximum effective gas phase relative permeability in gas seepage. The control mechanism of the micro-pore structure on the gas-water phase permeability can provide a powerful guide for the efficient development of water-producing gas reservoirs.

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周露,卓勤功,罗翔,等. 深层致密砂岩微观孔喉结构对气水相渗的控制机理[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-01
  • 最后修改日期:2024-05-27
  • 录用日期:2024-06-05
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