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Deabsorption PSTM Method and Application in Daqing Oilfield
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 7
Abstract
According to daqing oil field seismic data high resolution processing requirement, we have developed a migration scheme that can compensate absorption and dispersion caused by intrinsic attenuation in subsurface media. The scheme was developed by adapting prestack time migration (PSTM) in the frequency domain. Instead of applying a commonly used Q factor, we devised an effective Q parameter to compensate absorption and dispersion. The effective Q determines the frequency dependent traveltime and amplitude at one imaging location by only one value. As a result, the effective Q can be estimated by scanning technology. The proposed scheme can determine an effective Q model using surface seismic data during migration. Stabilization is achieved by introducing a smooth, maximum-limited gain function that matches the exact amplitude compensation factor when it is less than the user-specified gain limit. Higher-resolution imaging results of Daqing oilfield seismic data are obtained by application of the method.