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渗透率是储层特征和评价的重要参数之一,地层渗透性的好坏决定储层的产液能力。斯通利波在渗透性(或裂缝性)地层传播时会被衰减和反射,同时还发生频散,这些变化与地层的弹性、渗透率、裂缝等有关。本文利用单极子阵列声波测井资料提取出低频斯通利波,再经波场分离提取直达斯通利波、上行和下行反射斯通利波,计算斯通利波中心频率偏移和时间延迟。利用中心频率偏移和时间延迟来估算地层的渗透率,并结合横波各向异性对比压裂改造前后渗透率变化情况,取得了良好的应用效果。
Permeability is one of the important parameters of reservoir characteristics and evaluation. The permeability of the formation determines the production ability of the reservoir. Stoneley waves are attenuated and reflected as they propagate through the permeable (or fractured) formations, with dispersion also occurring. These changes are related to the formation’s elasticity, permeability, and fractures. In this paper, monopole array acoustic logging data extraction of low-frequency Stoneley wave, and then separated by the wave field extraction Stoneley wave, up and down reflection Stoneley wave, calculate the Stoneley wave center frequency offset and time delay. The center frequency offset and time delay are used to estimate the permeability of the formation, and the shear anisotropy is compared with that of the permeability before and after the fracturing reformation to obtain the good application effect.