基于中子自屏蔽校正的氯氢比确定含油饱和度的改进方法
Journal of China University of Petroleum(Edition of Natural Science)（2023）
Abstract
提出用铁的俘获伽马射线标记中子自屏蔽校正因子并组合氯氢比确定含油饱和度的方法.利用蒙特卡罗方法建立井筒-地层模型,模拟不同孔隙度和地层水矿化度条件下的俘获伽马能谱,研究中子自屏蔽因子及含油饱和度测井响应,并通过模拟实例来验证该方法.结果表明:铁标记中子自屏蔽校正后的氯氢比随孔隙度增加而增大,孔隙度相同时与含水饱和度呈线性变化关系,相对灵敏度可提高到 1 倍以上,能够解决常规氯氢比确定含油饱和度灵敏度下降的问题;计算含油饱和度误差降低,为高矿化度水地层脉冲中子俘获测井定量评价含油饱和度提供一种新方法.
MoreKey words
capture gamma spectra,chlorine hydrogen ratio,neutron self-shielding,oil saturation,Monte Carlo simulation
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