Imaging earth's interior based on adjoint methods-seismic inverse problems from continental to exploration scales

Hejun Zhu, Yang Luo, Ebru Bozdag, Daniel Peter, Jeroen Tromp

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Harnessing high-performance computers and accurate numerical methods to better constrain physical properties of Earth's interior is becoming one of the most important research topics in structural and exploration seismology. We use spectral- element and adjoint methods to iteratively improve 3D subsurface images ranging from continental to exploration scales. The spectral-element method, a high-order finite-element method with the advantage of a diagonal mass matrix, is used to accurately calculate three-component synthetic seismograms in a complex 3D Earth model. An adjoint method is used to numerically compute Frechet derivatives of a misfit function based on the interaction between the wavefield for a reference Earth model and a wavefield obtained by using time-reversed differences between data and synthetics at all receivers as simultaneous sources. In combination with gradient-based optimization methods, such as a preconditioned conjugate gradient method, we are able to iteratively improve 3D images of Earth's interior and gradually minimize discrepancies between observed and simulated seismograms. Various misfit functions may be chosen to quantify these discrepancies, such as cross- correlation traveltime differences, frequency-dependent phase and amplitude anomalies as well as full-waveform differences. Various physical properties of the Earth are constrained based on this method, such as elastic wavespeeds, radial anisotropy, shear attenuation and impedance contrasts. We apply this method to study seismic inverse problems at various scales, from continental-scale seismic tomography to exploration-scale full-waveform inversion. Two examples are utilized to illustrate the applications of this method, namely, 1) application of adjoint tomography in improving 3D elastic wavespeeds of the European crust and upper mantle, and 2) application of the impedance gradient in elastic reverse-Time migration for a 2D salt dome model.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013
Subtitle of host publicationChallenging Technology and Economic Limits to Meet the Global Energy Demand
Pages1774-1777
Number of pages4
StatePublished - Sep 9 2013
EventInternational Petroleum Technology Conference 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand, IPTC 2013 - Beijing, China
Duration: Mar 26 2013Mar 28 2013

Publication series

NameSociety of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand
Volume3

Other

OtherInternational Petroleum Technology Conference 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand, IPTC 2013
CountryChina
CityBeijing
Period3/26/133/28/13

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

Fingerprint Dive into the research topics of 'Imaging earth's interior based on adjoint methods-seismic inverse problems from continental to exploration scales'. Together they form a unique fingerprint.

  • Cite this

    Zhu, H., Luo, Y., Bozdag, E., Peter, D., & Tromp, J. (2013). Imaging earth's interior based on adjoint methods-seismic inverse problems from continental to exploration scales. In Society of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand (pp. 1774-1777). (Society of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand; Vol. 3).