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| Estimation of pre-stack Q-values in the radial trace transform domain |
TANG Chuan-Zhang1( ), WANG Jin-Kuan1, WEI Tao1, HUANG Xin-Ya1, CHENG Wan-Li2,3,4, WANG Shou-Dong2,3, LI Ying2,3 |
1. Huabei Oilfield Company, PetroChina, Renqiu 062552, China
2. College of Geophysics, China University of Petroleum(Beijing), Beijing 102249, China
3. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China
4. CNOOC(China) Limited Hainan Branch, Haikou 570100, China |
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Abstract Accurate estimation of the quality factor(Q) is essential for enhancing seismic data resolution and reservoir characterization.Conventional Q estimation methods generally utilize post-stack data, which neglect the impacts of raypaths.Moreover,the average effect of stacking alters the attenuation of seismic data,reducing the accuracy of Q estimation.Compared to post-stack data,the pre-stack data more faithfully preserve the attenuation properties of subsurface media,enabling more accurate Q estimation.Therefore,this study converted pre-stack data into the apparent velocity and travel time(R-T) domain,using the radial trace(RT) transform.Combined with the logarithmic spectral area double difference(LSADD) method,a pre-stack Q estimation method named QVAV_LSADD was proposed.This method accounted for the impacts of raypaths under imprecise interval velocities.Its high accuracy and strong noise resistance were validated through the processing of both synthetic and real data.
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Received: 15 June 2025
Published: 30 December 2025
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The three-layer model with parameters
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A synthetic CMP gather in the X-T domain(a) and transformed into the R-T domain(b)
Points A and B on the radial ray(red line) of the X-T domain are maps of points C and D on the same apparent velocity(1 000 m/s) of the R-T domain
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Q-value estimation diagram in RT transform domain
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The five-layer model with parameters
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A synthetic CMP gather in the X-T domain(a) and transformed into the R-T domain(b)
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Variation curves of Q values with offset estimated by different methods(LSADD, LSR, and PFS) for different layers
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Comparison of Q values estimated by different methods from the CMP gather
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A field CMP gather in the (a) X-T domain and (b) transformed into the R-T domain
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Estimated interval-Q and average-Q using the QVAV_LSADD method(a) and QVAV method(b)
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