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Method and sonic tool apparatus for investigating properties of earth formations transversed by a borehole

机译:用于调查井眼横穿的地层特性的方法和声波工具设备

摘要

Methods are provided which utilize a sonic tool for quantitatively determining parameters of a velocity profile of an altered zone in a rock formation traversed by a borehole. Synthetic amplitude information for the formation is generated by a computer model, by providing the computer with a proposed velocity profile for the formation, including values for parameters such as the radius of the altered zone and the acoustic velocities in the altered zone. The synthetic amplitude information is then compared with amplitude information (e.g. peak or total energy) of a compressional headwave as measured by the array sonic tool. If the comparison provides differences exceeding predetermined thresholds, the values for the parameters of the model are adjusted according to a least squares fit procedure until suitable values are found. The suitable values are then taken as the parameter values.
机译:提供了利用声波工具来定量确定井眼横穿的岩层中变化区域的速度分布参数的方法。地层的合成振幅信息是由计算机模型生成的,方法是为计算机提供建议的地层速度分布图,其中包括参数值,例如更改区域的半径和更改区域中的声速。然后将合成幅度信息与由阵列声波工具测量的压缩头波的幅度信息(例如峰值或总能量)进行比较。如果比较提供的差异超过预定阈值,则根据最小二乘拟合程序调整模型参数的值,直到找到合适的值为止。然后将合适的值用作参数值。

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