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An Estimation Method of Quality Factor q

A quality factor and variance technology, applied in the field of geophysical exploration, can solve problems such as inaccurate estimation, and achieve the effect of improving resolution and high precision of Q value

Active Publication Date: 2021-02-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating the quality factor Q, in order to solve the problem of inaccurate estimation of the existing quality factor estimation method

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  • An Estimation Method of Quality Factor q
  • An Estimation Method of Quality Factor q
  • An Estimation Method of Quality Factor q

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Embodiment Construction

[0029] Example of an estimation method for the quality factor Q:

[0030] The method for estimating the quality factor Q proposed in this embodiment includes the following steps:

[0031] 1) Extract the first arrival wave from the VSP data, and obtain the arrival time of the first arrival wave.

[0032] First, collect the VSP well data report, including the downgoing wave data of the VSP well and the interpretation horizon corresponding to the seismic data in the work area.

[0033] The downgoing wave data is separated from the VSP data, and then the first arrival wave is extracted from the downgoing wave data, and the arrival time of the first arrival wave is read from the VSP data at the same time. The arrival time of the first break can be read from the zero offset VSP logging time depth and velocity data table in the VSP well data report.

[0034] 2) Perform time-frequency transformation on the extracted first arrivals, and then calculate the first arrival amplitude spec...

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Abstract

The invention relates to a quality factor Q estimation method, and belongs to the technical field of geophysical exploration. The estimation method comprises the steps as follows: extracting a preliminary wave from VSP data, and obtaining the arrival time of the preliminary wave; calculating preliminary wave amplitude spectrums, which comprise preliminary wave amplitude spectrums before and afterattenuation; determining an effective frequency band, and determining a weight corresponding to each effective frequency in the effective frequency band range by utilizing a Gaussian function; obtaining weighted centroid frequencies of the preliminary wave amplitude spectrums before and after attenuation and a weighted variance before attenuation; and finally, obtaining a quality factor of a corresponding stratum. According to the invention, the frequency spectrum of the original data is not changed or fitted, only different weights are applied to the amplitude spectrums of different frequencies, the frequency spectrum information of the original data is fully and effectively utilized, the estimated quality factor Q value is high in precision, more accurate input is provided for subsequentQ value compensation, the resolution of seismic exploration processing data can be improved, and subsequent oil reservoir description, description and development are facilitated.

Description

technical field [0001] The invention relates to a method for estimating quality factor Q, which belongs to the technical field of geophysical exploration. Background technique [0002] Due to formation absorption attenuation and dispersion effect, seismic data amplitude attenuation and frequency loss are caused. In order to eliminate the influence of formation absorption attenuation on seismic data, it is necessary to perform inverse Q (quality factor) filtering on seismic data to compensate seismic data amplitude and broaden frequency. , the more accurate estimation of Q value can effectively improve the accuracy of seismic data. [0003] With the further in-depth research and application of geological exploration, the application of VSP data in lithology exploration has been paid more and more attention by geophysicists. Vertical Seismic Profiling (VSP) technology is a new seismic observation method corresponding to the conventional surface seismic observation technology....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 曾静凤胡小波赵平詹凤林江富贵杨梦娟
Owner CHINA PETROLEUM & CHEM CORP
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