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
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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