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Pre-stack Q-value inversion method based on generalized S-transform and pre-stack Q-value inversion system thereof

An inversion and generalized technology, applied in the field of petroleum geophysical exploration, can solve problems such as difficult to accurately estimate seismic wave attenuation, and achieve the effect of improving accuracy and resolution

Inactive Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a pre-stack Q value inversion method and system based on generalized S transform, which is used to solve the problem that the current Q value inversion technology is not easy to accurately estimate the seismic wave attenuation

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  • Pre-stack Q-value inversion method based on generalized S-transform and pre-stack Q-value inversion system thereof
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  • Pre-stack Q-value inversion method based on generalized S-transform and pre-stack Q-value inversion system thereof

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[0031] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0032] Aiming at the shortcomings of the traditional Q value estimation technology based on post-stack seismic data or VSP data, this embodiment provides a pre-stack Q value inversion method based on generalized S-transform, such as figure 1 As shown, it includes the following steps: Obtain the pre-stack CMP gather of the seismic wave layer model; use the generalized S-transform to analyze the time-frequency of the pre-stack CMP gather track by track to obtain the amplitude spectrum of the target layer; based on the amplitude spectrum of the target layer Spectrum, calculate the spectral ratio slope of each seismic trace in the target layer; calculate the ray ave...

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Abstract

The invention relates to the technical field of geophysical prospecting for petroleum, and discloses a pre-stack Q-value inversion method based on generalized S-transform and a pre-stack Q-value inversion system thereof. The pre-stack Q-value inversion method comprises the steps that a pre-stack CMP gather of a seismic wave layer model is acquired; time frequency analysis s performed on the pre-stack CMP gather trace by trace by using generalized S-transform so that the amplitude spectrum of a target layer is obtained; the spectrum ratio slope of each seismic trace of the target layer is solved based on the amplitude spectrum of the target layer; a zero-offset ray average quality factor is solved according to the linear relation of the spectrum ratio slope and the offset; and the interlayer Q-value of the seismic wave layer model is estimated according to the zero-offset ray average quality factor. The accuracy of the inversion result can be greatly enhanced, reservoir prediction can be effectively guaranteed, and the method and the system can be applied to reservoir prediction, crack detection and inverse Q filtering of the field of oil and gas prospecting so that the resolution of seismic data can be enhanced.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a pre-stack Q value inversion method and system based on generalized S transform. Background technique [0002] In the field of petroleum geophysical exploration technology, accurate estimation of seismic wave attenuation plays a vital role in improving imaging resolution, reservoir identification and fracture prediction, and Q value inversion is a commonly used method for estimating seismic wave attenuation. [0003] Most of the current Q value inversion techniques are based on zero-offset vertical seismic profile (VSP) or post-stack seismic data. The amplitude and travel time information are partially distorted, so that these techniques cannot accurately reflect some subtle characteristics of the formation, and it is difficult to avoid the averaging effect in the process of calculating the quality factor. In addition, the signal-to-noise ratio of VSP ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 陈文爽郭全仕滕龙罗亨许凯
Owner CHINA PETROLEUM & CHEM CORP
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