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Method and device for compensating absorption and attenuation of stratum

A technology for absorbing attenuation and stratigraphy, applied in measuring devices, seismology, geophysical measurements, etc., can solve the problem of reducing the signal-to-noise ratio of amplitude compensation results, and achieve the effect of improving the signal-to-noise ratio

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0003] Hargreaves and Calvert (1991) proposed an algorithm to calculate the inverse Q filter in the frequency domain. He regarded the attenuation as the process of wave field extension, and the inverse Q filter is the reverse continuation process of the wave field. In the process of compensation, the compensation factor will increase exponentially with the frequency, and usually the effective signal is concentrated in the range of tens of Hz, such a compensation factor will over-amplify the noise with higher frequency, thereby reducing the amplitude compensation result. SNR

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  • Method and device for compensating absorption and attenuation of stratum
  • Method and device for compensating absorption and attenuation of stratum
  • Method and device for compensating absorption and attenuation of stratum

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[0038] In order to make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the schematic embodiments and descriptions of the embodiments of the present application are used to explain the embodiments of the present application, but are not intended to limit the embodiments of the present application.

[0039] In order to illustrate the technical solutions proposed in the embodiments of the present application more clearly, before introducing the embodiments of the present application, a brief introduction to the method of compensating formation absorption attenuation, ie, inverse Q filtering, is made.

[0040] Considering attenuation as the process of wave field extension, then inverse Q filtering is the reverse extension process of wave field. For the propagation of a ...

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Abstract

The embodiment of the invention provides a method and a device for compensating absorption and attenuation of a stratum. The method comprises the following steps of: obtaining a seismic signal subjected to phase compensation at a pre-set position of a target stratum and a stratum quality factor of the target stratum; determining an amplitude-compensated gain control coefficient according to a pre-set gain control threshold value; constructing an amplitude-compensated shaping matrix according to a pre-set finite difference matrix and the gain control coefficient; obtaining an amplitude compensation action matrix of the seismic signal according to the shaping matrix, the stratum quality factor and the gain control coefficient; and carrying out amplitude compensation on the seismic signal according to the amplitude compensation action matrix and obtaining an amplitude-compensated result of the seismic signal. According to the method and device provided by the embodiment of the invention, the amplification factor of the amplitude compensation of a noise section of the seismic signal can be limited, so that the signal-noise-ratio of seismic information is guaranteed when the resolution ratio is improved.

Description

technical field [0001] The present application relates to the technical field of seismic prospecting, in particular to a method and device for compensating formation absorption attenuation. Background technique [0002] During the process of seismic wave propagation in the stratum, the amplitude of the seismic wave will attenuate and the phase will be distorted. This absorption and attenuation effect of the stratum is called the Q value effect of the stratum, which will reduce the resolution of the seismic section. In the process of seismic data processing In , the inverse-Q filtering technique is usually used to compensate for this attenuation. [0003] Hargreaves and Calvert (1991) proposed an algorithm to calculate the inverse Q filter in the frequency domain. He regarded the attenuation as the process of wave field extension, and the inverse Q filter is the reverse continuation process of the wave field. In the process of compensation, the compensation factor will incre...

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/362
Inventor 陈双全魏庆李向阳
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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