基于相对熵准则的CMP道集<i>Q</i>扫描

doi:10.13810/j.cnki.issn.1000-7210.2023.04.002

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Abstract The geodetic filtering effects(mainly thin layer overlapping effect, scattering effect, and inelastic effect) of underground media will attenuate seismic signal amplitudes, narrow frequency bands, reduce the main frequency, and distort phases, and they can be represented by the effect caused by equivalent Q value. It is very important to estimate the equivalent Q value reasonably and make the corresponding Q compensation to improve the seismic data resolution. The absorption attenuation is a cumulative effect. When the Q value of the stratum is constant, the attenuation of seismic wavelet becomes more and more obvious with the increase in the propagation distance/time and frequency. In other words, the amplitude and high-frequency components of deep and far offset reflection wavelets are attenuated more seriously. In this paper, it is assumed that the stratum is horizontally layered, and the reflection events conform to the hyperbolic law;the underground root mean square velocity model is known, and a single attenuation wavelet can be extracted along the time window of the hyperbolic trajectory by using the CMP gather. Then a set of Q values is selected to compensate for the amplitude spectrum of the attenuation wavelet in the frequency domain by Q values. According to the principle of optimum consistency of amplitude spectrum of compensated seismic wavelet at different offsets, the equivalent Q value of horizontal strata is estimated. This method needs an excellent measurement criterion. Therefore, the measurement criteria, such as similarity coefficient, centroid frequency, KL divergence, and JS divergence are compared. Experimental results show that the JS divergence criterion is more sensitive to the normalized amplitude spectrum consistency measurement and has a stronger anti-noise ability when the appropriate frequency band range(e. g., 0~60 Hz) is selected. The quality factor estimation method by CMP gather scanning based on relative entropy criterion can obtain relatively stable equivalent Q value estimation results when the signal-to-noise ratio is suitable.

Key words： absorption attenuation CMP gather amplitude spectrum consistency Q scanning relative entropy JS diver gence equivalent Q value

Received: 15 November 2022

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P631

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	LI Penghui
	WANG Huazhong

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LI Penghui,WANG Huazhong. CMP gather Q scanning based on relative entropy criterion[J]. OGP, 2023, 58(4): 801-811.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.04.002 OR http://www.ogp-cn.com/EN/Y2023/V58/I4/801

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