地震信号倒谱分解技术及其在超深层碳酸盐岩储层烃类检测中的应用

doi:10.11720/wtyht.2024.1481

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Abstract

The cepstrum decomposition technology for seismic signals,recently developed for hydrocarbon detection,can highlight weak fluid information in some specific frequency bands of broadband seismic signals.This study explored the cepstrum decomposition technology for seismic signals using Fourier transform(FT)- and wavelet packet transform (WPT)-based cepstrum.Moreover,the technology was applied to the ultradeep carbonate reservoirs in the Shunbei area for hydrocarbon detection.A comparative analysis was conducted on the characteristics of common cepstrum profiles and conventional common frequency profiles.Furthermore,a detailed comparative analysis was conducted on the characteristics of the first- and second-order common cepstrum profiles of FT- and WPT-based cepstra.On this basis,the hydrocarbon detection effects were compared between FT- and WPT-based cepstra.The processing results of actual seismic data show that compared to the conventional spectral decomposition technology based on wavelet transform,the cepstrum decomposition technology manifested higher spatio-temporal resolution,providing more detailed information. Contrasting with FT-based cepstrum decomposition,WPT-based cepstrum decomposition provided a more accurate interpretation of gas-bearing properties through the seismic amplitude anomaly profiles.

Key words： cepstrum decomposition Fourier transform-based cepstrum wavelet packet transform-based cepstrum ultradeep carbonate reservoir

Received: 11 February 2024 Published: 08 January 2025

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	Articles by authors
	Yong-Sheng ZHANG
	Chao HUANG
	Jun LIU
	Yong-Heng ZHANG
	Xing-Jian WANG
	Ya-Juan XUE

Cite this article:

Yong-Sheng ZHANG,Chao HUANG,Jun LIU, et al. Cepstrum decomposition of seismic signals and its application in hydrocarbon detection of ultradeep carbonate reservoirs[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1618-1625.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1481 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1618

Flow chart of seismic data cepstrum decomposition technology based on Fourier-based cepstrum

Flow chart of seismic data cepstrum decomposition technology based on wavelet-based cepstrum

Geological model(a) and its seismic response profile(b)

层号	V_p $/$ (m·s^-1)	$ρ$ /(g·cm^-3)	$ζ$ /Hz	$η$ /(m²·s^-1)	$Q$
①	5000	2.500	1.0	1.0	200
②	5260	2.539	1.0	1.0	200
③	5320	2.548	1.0	1.0	200
④	5100	2.515	5	400	5
⑤	5550	2.583	1.0	1.0	200
⑥	5800	2.620	1.0	1.0	200

Parameters for the geological model

Seismic amplitude anomaly section
a—Fourier-based cepstrum;b—wavelet-based cepstrum

The seismic section intersecting a known gas well

First-order common quefrency and common frequency sections of the seismic section intersecting the known well
a—8 Hz common frequency section extracted by the CWT,Morlet wavelet is used in wavelet transform;b—first-order common quefrency section extracted by Fourier-based ceptrum;c—first-order common quefrency section extracted by the wavelet-based cepstrum

First and second-order common quefrency sections extracted from Fourier-based cepstrum and wavelet-based cepstrum
a—first-order common quefrency section extracted by Fourier-based cepstrum;b—second-order common quefrency section extracted by Fourier-based cepstrum;c—first-order common quefrency section extracted from wavelet-based cepstrum;d—second-order common quefrency section extracted from wavelet-based cepstrum

Seismic amplitude anomaly section
a—Fourier-based cepstrum;b—wavelet-based cepstrum

Seismic amplitude anomaly slice
a—Fourier-based cepstrum;b—wavelet-based cepstrum

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