| 摘要 |
A method and system for acoustic well logging for obtaining an indirect measure of shear wave velocities for earth formations surrounding a well borehole. The method and system relate to an indirect technique for inverting Stoneley wave velocity data to obtain an estimate of shear wave velocities of formations surrounding the borehole substantially concurrent with the logging operation. A subassembly adapted to be connected to an acoustic well logging sonde and form a part thereof provides measures of fluid density and velocity, and borehole radius as well as formation density and impedance. By combining the output of the well logging sonde and subassembly with the aid of a processor, one is able to obtain a measure of formation shear wave velocities, by constraining the inversion of measured Stoneley wave velocity data, substantially in real-time. This method is especially useful in slow formations where direct shear wave velocities cannot be obtained or where shear wave velocities are difficult to obtain.
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