【摘要】 利用阻抗和泊松比等属性的交会分析来描述不同的岩石和流体类型,正日益成为常用研究方法。本文尝试将泊松阻抗属性用于油气检测。泊松阻抗被定义为泊松速度与密度的乘积,泊松速度与地震波的纵、横波速度(或泊松比)有关,因此泊松阻抗综合了泊松比和密度两种属性的特点,在检测气砂岩方面有其独特优势。对平湖油气田PH9井的应用结果表明,构建的泊松阻抗提高了平湖组下部水砂岩和气砂岩的分辨能力;同时在弹性阻抗反演的基础上,初步探讨了泊松阻抗在剖面上对气层的识别能力,见到了明显的效果。更多还原

【Abstract】 Using cross analysis of impedance and Poisson to describe different rock and fluid type becomes common-used study method day by day.The paper tried to use the attribute of Poisson impedance for oil/gas detection.The Poisson impedance is defined as multiplication of Poisson velocity and density,the former is relative to P-and S-wave velocity of seismic waves(or Poisson ratio),and Poisson impedance integrates the feature of two attributes: Poisson ratio and density,which has special superiority in detection of gas-bearing sandstone.The results of application in PH9 well of Pinghu Oil/Gas Field showed that the constructed Poisson impedance raises the ability identifying water-bearing sandstone and gas-bearing sandstone in lower part of Pinghu Formation;meanwhile,on the basis of elastic impedance inversion,preliminary discussion on the ability identifying the gas-bearing strata on the profile by Poisson impedance achieved clear effect.更多还原