Simultaneous travel time tomography for updating both velocity and reflector geometry in triangular/tetrahedral cell model

To conduct forward and simultaneous inversion in a complex geological model, including an irregular topography (or irregular reflector or velocity anomaly), we in this paper combined our previous multiphase arrival tracking method (referred as triangular shortest-path method, TSPM) in triangular (2D...

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Bibliographic Details
Published inJournal of seismology Vol. 22; no. 3; pp. 559 - 574
Main Authors Bai, Chao-ying, He, Lei-yu, Li, Xing-wang, Sun, Jia-yu
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.05.2018
Springer Nature B.V
Subjects
Banks (topography)
Computer applications
Computer simulation
Conjugate gradient method
Earth and Environmental Science
Earth Sciences
Geometry
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Mathematical models
Modelling
Multiphase
Norms
Numerical simulations
Original Article
Seismology
Shortest-path problems
Slope
Structural Geology
Three dimensional models
Tomography
Topography
Topography (geology)
Tracking
Travel
Travel time
Two dimensional models
Velocity
A tetrahedral cell model
Simultaneous travel time inversion
Complex velocity model
Triangular shortest-path method
A triangular cell model
Reflector geometry
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Summary:To conduct forward and simultaneous inversion in a complex geological model, including an irregular topography (or irregular reflector or velocity anomaly), we in this paper combined our previous multiphase arrival tracking method (referred as triangular shortest-path method, TSPM) in triangular (2D) or tetrahedral (3D) cell model and a linearized inversion solver (referred to as damped minimum norms and constrained least squares problem solved using the conjugate gradient method, DMNCLS-CG) to formulate a simultaneous travel time inversion method for updating both velocity and reflector geometry by using multiphase arrival times. In the triangular/tetrahedral cells, we deduced the partial derivative of velocity variation with respective to the depth change of reflector. The numerical simulation results show that the computational accuracy can be tuned to a high precision in forward modeling and the irregular velocity anomaly and reflector geometry can be accurately captured in the simultaneous inversion, because the triangular/tetrahedral cell can be easily used to stitch the irregular topography or subsurface interface.
ISSN:1383-4649
1573-157X
DOI:10.1007/s10950-017-9722-9