Acoustic logging anisotropic scale device and method

Abstract

The present invention relates to an acoustic logging anisotropic scale device and method. The device comprises a scale device and a logging instrument, wherein the scale device is composed of four materials of two types having different longitudinal and transverse wave propagation speeds, each two of the four materials of two types are firmly stuck and placed at intervals and the adjacent materials are different from each other; a well hole is formed at the center of the scale device, and the logging instrument is placed in the well hole of the scale device; each time for the logging instrument to rotate in the well hole of the scale device, an orthogonal dipole source emits an acoustic wave, which is transmitted to an orthogonal dipole receiver after passing through the scale device, one-time orthogonal dipole acoustic wave measurement is carried out, a group of four-component waveform is obtained and the azimuthal angle for the rotation of the logging instrument is recorded; then, the azimuthal angle and anisotropy of the fast and slow shear waves are obtained through a cross dipole logging anisotropic inversion method. According to the acoustic logging anisotropic scale device and method in the invention, a simple and feasible equivalent anisotropic model well setting and construction method is realized through a special design of the scale device, and the performance of thelogging instrument and the scale instrument can be verified.

Description

technical field [0001] The invention relates to the fields of petroleum geophysical exploration and acoustic logging, in particular to an anisotropic calibration device and method for acoustic logging. Background technique [0002] With the continuous deepening of my country's oil and gas exploration and development, all oilfields are carrying out research on the exploration and development of complex oil and gas reservoirs. In the field of geophysical logging, the formation properties to be measured are becoming more and more complex, and the requirements for instrument performance are getting higher and higher. test. The measurement of formation anisotropy has always been a difficult point in geophysical exploration research. The orthogonal dipole acoustic logging method can be used to invert the lateral The magnitude and orientation of anisotropy in vertical wells in isotropic (HTI) formations or horizontal wells in VTI formations, and this information is of great signifi...

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Problems solved by technology

Although mudstone is a natural anisotropic medium, it is easy to break, and the anisotropy cannot be adjusted artificially, so it is difficult to form intervals with different anisotropy

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