TY - JOUR
T1 - Improved seismic image by Q-compensated reverse time migration
T2 - Application to crosswell field data, west Texas
AU - Zhu, Tieyuan
AU - Harris, Jerry M.
N1 - Publisher Copyright:
© 2015 Society of Exploration Geophysicists.
PY - 2015/3/4
Y1 - 2015/3/4
N2 - To test the effectiveness of the Q-compensated reverse time migration (Q-RTM) method, we applied it to crosswell seismic data from western Texas. This crosswell field survey was aimed at determining the boundaries and even the internal features of the reservoir. In this area, the reservoir geologic body exhibits strong attenuation that reduces high frequencies more rapidly. Thus, conventional acoustic RTM produces a dimmed image (reduced amplitude and low resolution) of the reservoir area and structures underneath. In contrast, Q-RTM is able to compensate for the attenuation effects during imaging. The VP and QP profiles needed for Q-RTM were produced by joint traveltime and frequency shift tomography. Preprocessing of the data was carried out to reduce noise, remove tube waves, and to separate up- and downgoing wavefields. Along with recovered high wavenumbers, the final Q-RTM image provided many details about geologic layers and structures. The lateral and vertical extent and internal structures within the reservoir unit were clearly determined. These geologic features were also correlated to the velocity profile and sonic logs. We concluded that Q-RTM imaging practically improved the image resolution in attenuating geologic media.
AB - To test the effectiveness of the Q-compensated reverse time migration (Q-RTM) method, we applied it to crosswell seismic data from western Texas. This crosswell field survey was aimed at determining the boundaries and even the internal features of the reservoir. In this area, the reservoir geologic body exhibits strong attenuation that reduces high frequencies more rapidly. Thus, conventional acoustic RTM produces a dimmed image (reduced amplitude and low resolution) of the reservoir area and structures underneath. In contrast, Q-RTM is able to compensate for the attenuation effects during imaging. The VP and QP profiles needed for Q-RTM were produced by joint traveltime and frequency shift tomography. Preprocessing of the data was carried out to reduce noise, remove tube waves, and to separate up- and downgoing wavefields. Along with recovered high wavenumbers, the final Q-RTM image provided many details about geologic layers and structures. The lateral and vertical extent and internal structures within the reservoir unit were clearly determined. These geologic features were also correlated to the velocity profile and sonic logs. We concluded that Q-RTM imaging practically improved the image resolution in attenuating geologic media.
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U2 - 10.1190/GEO2014-0463.1
DO - 10.1190/GEO2014-0463.1
M3 - Article
AN - SCOPUS:84924232761
VL - 80
SP - B61-B67
JO - Geophysics
JF - Geophysics
SN - 0016-8033
IS - 2
ER -