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利用基于russell近似的弹性波阻抗反演进行储层描述和流体识别

Keywords: russell近似,弹性波阻抗,反演,流体因子,储层预测,流体识别

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Abstract:

?本文基于russell提出的多孔流体饱和弹性介质的佐普里兹方程形式的近似公式,借鉴弹性波阻抗的原理,推导了标准化的以流体因子f、拉梅常数μ和密度ρ表示的新的弹性波阻抗公式。通过反演可以直接从弹性波阻抗数据体中提取流体因子f和拉梅常数μ数据体,从而将弹性波阻抗与流体因子联系起来,兼顾了常规弹性波阻抗反演的高抗噪性以及利用流体因子识别流体的直观性,并且流体因子f的直接提取方法减少了间接计算的误差累积过程,为储层流体预测提供了一种新的途径。利用文中方法在sl油田y3工区提取的流体因子f可以有效地区分出不同的流体类型,流体因子f对流体类型的敏感程度要优于其他常规属性,对沙二段储层流体的识别更加准确可靠,在储层流体识别与寻找剩余油方面显示了较好的应用效果。

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