Variable Q value calculation method based on unsteady state deconvolution

An unsteady, deconvolution technology, applied in the field of geophysical exploration, can solve the problem of limiting the idea of ​​​​estimating the Q value of unsteady deconvolution, and achieve the effect of sufficient information and reliable estimation results

Inactive Publication Date: 2014-10-01
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

In fact, this feature also limits the idea of ​​using unsteady deconvolution to estimate Q value in academia to a certain extent.

Method used

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  • Variable Q value calculation method based on unsteady state deconvolution
  • Variable Q value calculation method based on unsteady state deconvolution
  • Variable Q value calculation method based on unsteady state deconvolution

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Embodiment Construction

[0057] Such as figure 1 shown. Here, a numerical model test is used to illustrate the process of dividing hyperbolic strips and iteratively suppressing the influence of wavelets to obtain true slope characteristics. There is a three-layer reflection coefficient model in the model, which is divided into three layers, and the reflection coefficient amplitude level of the middle layer is 1 / 3 of that of the upper and lower layers. In the model test, the source wavelet with the main frequency of 40hz and the minimum phase is used to synthesize the seismic trace with the reflection coefficient sequence, and then Q=32 is given to attenuate the seismic trace in the time-frequency domain, thereby obtaining the final synthetic seismic Record. figure 1 In a, 20 hyperbolic band divisions (i.e., contours of the product of time and frequency) are schematically shown. If the data mean characteristics under each hyperbolic strip are firstly counted, the attenuation curve is established as ...

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Abstract

The invention discloses a variable Q value calculation method based on unsteady state deconvolution. According to the method, energy relation in hyperbolic stripes is fully utilized, counted and analyzed in a logarithm domain, a basic technique idea of Q calculation is established by utilizing linear fitting slope information, adverse effects of seismic wavelet are suppressed constantly with the help of an iteration mechanism, and the longitudinal and transverse stability and practicability of estimation of Q value are improved. According to the method, the Q value is calculated by utilizing an energy statistic relation for the first time, compared with a traditional method, data of a whole time-frequency domain can be utilized fully, information amount is sufficient, estimation results are more reliable, and matching situation with geological background is better. The idea of utilizing iteration linear fitting for suppressing the influences of the seismic wavelet constantly is emphasized, and approximation to precision of the underground Q value is further achieved.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, in particular to a variable Q value calculation method based on unsteady deconvolution. Background technique [0002] Unsteady features are an important research aspect in the field of seismic data processing. Most of the current deconvolutions are based on the classic Robinson convolution model. However, this convolution model approximately considers that the seismic wavelet does not change with time, and has insufficient understanding of the inherent instability of seismic signals. Therefore, This type of deconvolution, also known as static deconvolution, is of largely limited practical value. Different from the static deconvolution technique, Gabor deconvolution is based on the unsteady convolution model, focusing on the influence of absorption attenuation. The non-stationary characteristics of the signal, so Gabor deconvolution is also called non-stationary deconvolution. In the past...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 孙学凯孙赞东韩剑发
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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