Asymmetric remote detection logging method

Abstract

The invention belongs to the technical field of acoustic logging data processing and interpretation methods, and particularly relates to an asymmetric remote detection logging method. By means of theremote detection logging method, a shear wave can be effectively detected, and reflected signals of geological abnormal bodies in different directions can be finally sensitively distinguished, so thata new idea for circumferential borehole omnibearing reflected shear wave imaging is provided. According to the asymmetric measurement remote detection logging method, a symmetric dipole array is adopted as an emitting combination, n receiving electrodes are arranged for matching each emitting electrode correspondingly, and n is a natural number greater than or equal to 1; and the plane where thereceiving electrodes are located and the plane where the emitting electrodes are located are arranged in parallel, and an included angle other than zero exists between any one emitting electrode and the corresponding receiving electrodes matched with the emitting electrode.

Description

technical field [0001] The invention belongs to the technical field of acoustic logging data processing and interpretation methods, and in particular relates to an asymmetric remote detection logging method. Background technique [0002] As a commonly used logging method, acoustic logging uses the changes in acoustic properties such as velocity, amplitude, and frequency when sound waves propagate in different rock formations to measure the characteristics of the drilling geological section, and finally judge the cementing. quality. [0003] For example, if Figure 1-3 As shown, according to the basic principle of borehole acoustics, the wave equation and its displacement solution can be obtained as follows: [0004] (λ+μ)▽(▽·u)+μ▽ 2 u+ρω 2 u (1) [0005] [0006] Among them, Φ is the longitudinal wave displacement potential function; is the unit vector in the z direction; Γ is the SV shear wave displacement potential function; χ is the SH shear wave displacement pot...

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Problems solved by technology

[0031] Therefore the inventor finds that there are still following defects in the existing remote detection logging process: when using shear wave reflection signals to image geological anomalies in different orientations (using such as Figure 4 When the dipole and the receiving dipole are set in a symmetrical structure as shown), technicians cannot solve the problem of indistinguishable left and right detection of dipole reflected shear waves

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