TY - GEN

T1 - Inversion of vertical wavefield variation to obtain a velocity model through integration

AU - Choi, Yun Seok

AU - Alkhalifah, Tariq Ali

N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We are grateful to King Abdullah University of Science and Technology for financial supports. For computer time, this research used the resources of the Super Computing Laboratory at KAUST in Thuwal, Saudi Arabia.

PY - 2018/10/16

Y1 - 2018/10/16

N2 - One of the main weaknesses of the Born approximation is its limited accuracy for large size perturbations. Thus, in FWI, our Born approximated gradients tend to capture only the edges of such perturbations if low frequencies are missing. In this new rendition of an FWI algorithm, we update vertical velocity variations by inverting the vertical wavefield variations. The resulting vertical variation of the velocity induces long wavelength updates of the velocity through integration, and thus, low frequencies are not needed. We calculate the vertical wavefield variation by downward continuation using the double-square-root equation. We employ the adjoint-state method to derive the gradient for vertical velocity variation. Examples validate the feasibility of the proposed FWI method for data missing low frequencies.

AB - One of the main weaknesses of the Born approximation is its limited accuracy for large size perturbations. Thus, in FWI, our Born approximated gradients tend to capture only the edges of such perturbations if low frequencies are missing. In this new rendition of an FWI algorithm, we update vertical velocity variations by inverting the vertical wavefield variations. The resulting vertical variation of the velocity induces long wavelength updates of the velocity through integration, and thus, low frequencies are not needed. We calculate the vertical wavefield variation by downward continuation using the double-square-root equation. We employ the adjoint-state method to derive the gradient for vertical velocity variation. Examples validate the feasibility of the proposed FWI method for data missing low frequencies.

UR - http://hdl.handle.net/10754/663450

UR - http://www.earthdoc.org/publication/publicationdetails/?publication=92274

UR - http://www.scopus.com/inward/record.url?scp=85083938308&partnerID=8YFLogxK

U2 - 10.3997/2214-4609.201800893

DO - 10.3997/2214-4609.201800893

M3 - Conference contribution

SN - 9789462822542

BT - 80th EAGE Conference and Exhibition 2018

PB - EAGE Publications BV

ER -