Application of acoustic full waveform inversion for density estimation

TY – GEN

T1 – Application of acoustic full waveform inversion for density estimation

AU – Jeong, Woodon

AU – Min, Dong Joo

N1 – Publisher Copyright:
© 2012 SEG.

PY – 2012

Y1 – 2012

N2 – Although full waveform inversion (FWI) is a promising method to provide subsurface material properties and has been extensively studied, there are still needs to improve FWI particularly in case of multi-parameters. In this study, we propose a multi-parameter acoustic FWI strategy that can recover both velocity and density. The strategy is developed analyzing the characteristics of acoustic FWI based on a couple of parameterizations in acoustic wave equation for heterogeneous media. Our strategy consists of two stages. In the first stage, density is fixed at an arbitrary value, and velocity is only restored updating the bulk modulus based on the wave equation parameterized by bulk modulus and density. In this case, although the bulk modulus can be wrong, the inferred velocity can be reasonable. In the second stage, both velocity and density are inverted based on the wave equation parameterized by velocity and density. For the second stage, bulk modulus rather than velocity itself is updated, which is performed by using a chain rule to compute the gradient of bulk modulus. Our FWI uses the finite-element method and the back-propagation method. Numerical examples for synthetic data of the SEG/EAGE overthrust model show that our hierarchical strategy for acoustic FWI yields better results than the conventional method.

AB – Although full waveform inversion (FWI) is a promising method to provide subsurface material properties and has been extensively studied, there are still needs to improve FWI particularly in case of multi-parameters. In this study, we propose a multi-parameter acoustic FWI strategy that can recover both velocity and density. The strategy is developed analyzing the characteristics of acoustic FWI based on a couple of parameterizations in acoustic wave equation for heterogeneous media. Our strategy consists of two stages. In the first stage, density is fixed at an arbitrary value, and velocity is only restored updating the bulk modulus based on the wave equation parameterized by bulk modulus and density. In this case, although the bulk modulus can be wrong, the inferred velocity can be reasonable. In the second stage, both velocity and density are inverted based on the wave equation parameterized by velocity and density. For the second stage, bulk modulus rather than velocity itself is updated, which is performed by using a chain rule to compute the gradient of bulk modulus. Our FWI uses the finite-element method and the back-propagation method. Numerical examples for synthetic data of the SEG/EAGE overthrust model show that our hierarchical strategy for acoustic FWI yields better results than the conventional method.

UR – www.scopus.com/pages/publications/85051924990

U2 – 10.1190/segam2012-0196.1

DO – 10.1190/segam2012-0196.1

M3 – Conference contribution

AN – SCOPUS:85051924990

SN – 9781622769452

T3 – Society of Exploration Geophysicists International Exposition and 82nd Annual Meeting 2012, SEG 2012

SP – 2702

EP – 2706

BT – Society of Exploration Geophysicists International Exposition and 82nd Annual Meeting 2012, SEG 2012

PB – Society of Exploration Geophysicists

T2 – Society of Exploration Geophysicists International Exposition and 82nd Annual Meeting 2012, SEG 2012

Y2 – 4 November 2012 through 9 November 2012

ER –