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Method and device for determining shear-wave attenuation factor in multi-pole array acoustic logging

An array acoustic wave logging and attenuation factor technology, which is applied in the field of reservoir exploration, can solve the problems of many shear wave attenuation calculation limitations and difficult waveform extraction, saving time and labor costs, improving accuracy and reliability, and improving efficiency. Effects of Sexuality and Accuracy

Active Publication Date: 2019-10-01
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

However, the calculation of shear wave attenuation has many limitations. In hard formations, shear waves and high-amplitude pseudo-Rayleigh waves are mixed together, and the waveform is difficult to extract; in soft formations, shear waves and pseudo-Rayleigh waves do not exist.

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  • Method and device for determining shear-wave attenuation factor in multi-pole array acoustic logging

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Embodiment Construction

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0054] Aiming at the problem that the existing technology cannot accurately obtain or estimate the shear wave attenuation factor of multipole subarray acoustic logging, the applicant started from the reliability of the evaluation method of shear wave attenuation, and learned through a large amount of data analysis and experiments: a reliable evaluation The met...

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Abstract

The present invention provides a method and a device for determining a shear-wave attenuation factor in multi-pole array acoustic logging. The method comprises the following steps: acquiring multi-pole array acoustic logging data of a target stratum; according to the multi-pole array acoustic logging data of the target stratum, determining a corresponding flexural-wave attenuation factor; and determining the shear-wave attenuation factor at preset frequency by applying the flexural-wave attenuation factor, and evaluating the target stratum according to the shear-wave attenuation factor. By theadoption of the method provided by the invention, the shear-wave attenuation factor in multi-pole array acoustic logging can be effectively and accurately acquired, and then the evaluating accuracy of a target reservoir as well as the accuracy and the reliability of a reservoir exploration-development scheme can be effectively improved.

Description

technical field [0001] The application relates to the technical field of reservoir exploration, in particular to a method and device for determining shear wave attenuation factors in multipole subarray acoustic logging. Background technique [0002] The elastic wave attenuates when propagating in the underground medium, and the attenuation coefficient of the wave is of great significance to the evaluation of the gas-bearing property, pore fluid saturation, lithology and permeability of the underground medium. The attenuation factor is widely used in conventional logging reservoir evaluation, and the formation can be evaluated by combining the attenuation factors of P- and S-waves. [0003] The attenuation factor of P-wave is generally obtained by using the spectrum ratio method or centroid shift method from the array acoustic logging data measured by the monopole. In 1974, M. Bath proposed the spectral ratio method. The principle of this method is to take the time-domain wa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/14E21B49/00
CPCE21B47/14E21B49/00
Inventor 王兵叶正伟李卓
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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