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Formation quality factor determination method, device and system

A technology of formation quality factor and weight factor, applied in seismic signal processing and other directions, can solve problems such as poor robustness and inability to make full use of full-frequency attenuation information, and achieve the effect of improving accuracy and reducing high-frequency noise

Active Publication Date: 2018-08-10
PETROCHINA CO LTD
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Problems solved by technology

However, the spectral ratio method only uses amplitude spectrum information, which is less robust
Then the logarithmic spectrum area difference method proposed on this basis can suppress the noise to a certain extent, but it cannot make full use of the attenuation information of the whole frequency band.

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  • Formation quality factor determination method, device and system
  • Formation quality factor determination method, device and system
  • Formation quality factor determination method, device and system

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Embodiment Construction

[0056] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below in conjunction with the drawings in one or more embodiments of this specification Obviously, the described embodiments are only some of the embodiments in the description, not all of them. Based on one or more embodiments in the description, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the embodiments of the description.

[0057] The absorption and attenuation of the formation is an important factor affecting the resolution of seismic data. The absorption and attenuation of the formation is mainly manifested in the attenuation of the amplitude of the seismic wave with the increase of the propagation distance or time, and the phase is distorted. ...

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Abstract

The embodiment of the invention discloses a formation quality factor determination method, device and system. The method comprises the steps that spectral analysis is performed on the intrinsic attenuation seismic data so as to acquire the seismic wave amplitude spectrum; the amplitude spectrum ratio log function is calculated according to the extracted seismic wave amplitude spectrum before and after attenuation; the generalized spectral ratio function is constructed according to the amplitude spectrum ratio log function, including the steps that the amplitude spectrum ratio log function is discretized, and a weight factor is added to the discretized amplitude spectrum ratio log function so as to acquire the generalized spectral ratio function, wherein the weight factor includes the discretized seismic wave amplitude spectrum; and the formation quality factor is determined according to the generalized spectral ratio function. With application of the formation quality factor determination method, device and system, the accuracy of formation quality factor determination can be enhanced.

Description

technical field [0001] The invention relates to the technical field of oil and gas seismic exploration data processing, in particular, to a method, device and system for determining formation quality factors. Background technique [0002] In the process of continuous and in-depth development of seismic exploration, a large number of seismic data are used for the fine description of oil and gas reservoirs and the monitoring of instantaneous changes in reservoirs during production. Get more and more demanding. The absorption and attenuation of formation is an important factor affecting the resolution of seismic data. Studying the propagation of seismic waves in the attenuating formation, accurately extracting the formation quality factor Q value, and then performing inverse Q filter attenuation compensation on the seismic records can make the shallow, middle and deep reflection wave waveforms of the seismic section basically consistent, and make the shallow and middle layers ...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 高建虎邓智勇李胜军刘炳杨袁三一王尚旭
Owner PETROCHINA CO LTD
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