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Multi-frequency inversion of modal dispersions for estimating formation anisotropy constants
Multi-frequency inversion of modal dispersions for estimating formation anisotropy constants
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机译:模态频散的多频逆估计地层各向异性常数
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摘要
Systems and methods for the estimating a plurality of anisotropic elastic constants (Cij) using borehole dispersions and refracted compressional headwave velocity at a single logging depth in a vertical, deviated, or horizontal wellbore in a transversely-isotropic with a vertical axis of symmetry (“TIV”) formation. The estimated elastic constants can then be used to calculate near-wellbore stress distributions in the wellbore, which aids in an optimal completion design, such as for shale-gas production in the presence of shale heterogeneity.
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机译:用于在横观各向同性的垂直,偏斜或水平井眼中在单个测井深度使用井眼色散和折射压缩头波速度估算多个各向异性弹性常数(C ij Sub>)的系统和方法具有垂直对称轴(“ TIV”)的形式。然后,估计的弹性常数可用于计算井眼中的近井眼应力分布,这有助于优化完井设计,例如在存在页岩异质性的情况下生产页岩气。
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