TY - GEN
T1 - Full Wavefield Redatuming: Accurate Velocity Modelling for Imaging Beneath Complex Overburden
AU - Dzulkefli, Farah Syazana
AU - Xin, Kefeng
AU - Ghazali, Ahmad Riza
AU - Qiang, Guo
AU - Alkhalifah, Tariq Ali
N1 - KAUST Repository Item: Exported on 2021-03-30
Acknowledgements: We would like to thank PETRONAS management for giving permission to publish this work and to KAUST for the successful collaboration and to our colleagues for their unconditional support.
Bakulin, A., & Calvert, R. (2004). Virtual source: new method for imaging and 4D below complex overburden. In SEG Technical Program Expanded Abstracts2004 (pp. 2477–2480). Society of Exploration Geophysicists.
PY - 2021/3/16
Y1 - 2021/3/16
N2 - Salt is known for having a generally low density and higher velocity compared with the surrounding rock layers which causes the energy to scatter once the seismic wavefield hits the salt body and relatively less energy is transmitted through the salt to the deeper subsurface. As a result, most of imaging approaches are unable to image the base of the salt and the reservoir below the salt. Even the velocity model building such as FWI often fails to illuminate the deeper parts of salt area. In this paper, we show that Full Wavefield Redatuming (FWR) is used to retrieved and enhance the seismic data below the salt area, leading to a better seismic image quality and allowing us to focus on updating the velocity in target area below the salt. However, this redatuming approach requires a good overburden velocity model to retrieved good redatumed data. Thus, by using synthetic SEAM model, our objective is to study on the accuracy of the overburden velocity model required for imaging beneath complex overburden. The results show that the kinematic components of wave propagation are preserved through redatuming even with heavily smoothed overburden velocity model.
AB - Salt is known for having a generally low density and higher velocity compared with the surrounding rock layers which causes the energy to scatter once the seismic wavefield hits the salt body and relatively less energy is transmitted through the salt to the deeper subsurface. As a result, most of imaging approaches are unable to image the base of the salt and the reservoir below the salt. Even the velocity model building such as FWI often fails to illuminate the deeper parts of salt area. In this paper, we show that Full Wavefield Redatuming (FWR) is used to retrieved and enhance the seismic data below the salt area, leading to a better seismic image quality and allowing us to focus on updating the velocity in target area below the salt. However, this redatuming approach requires a good overburden velocity model to retrieved good redatumed data. Thus, by using synthetic SEAM model, our objective is to study on the accuracy of the overburden velocity model required for imaging beneath complex overburden. The results show that the kinematic components of wave propagation are preserved through redatuming even with heavily smoothed overburden velocity model.
UR - http://hdl.handle.net/10754/668340
UR - https://onepetro.org/IPTCONF/proceedings/21IPTC/4-21IPTC/Virtual/460722
U2 - 10.2523/iptc-21771-ms
DO - 10.2523/iptc-21771-ms
M3 - Conference contribution
BT - Day 4 Fri, March 26, 2021
PB - IPTC
ER -