HR: 16:00h
AN: S44A-03 INVITED     [Abstracts]
TI: Seismic Inversion for Hydrocarbon Exploration, Crustal Structure and Whole Earth Modeling
AU: * Sen, M K
EM: mrinal@ig.utexas.edu
AF: University of Texas at Austin, UTIG 4412 Spicewood Springs Road, Building 600, Austin, Tx 78759 United States
AB: Seismic inversion employing travel time, amplitudes and full waveform attributes is a challenging task. In order to maintain accuracy and computational speed, it is important to make judicial choice of optimization methods, onstraints, a priori information, forward modeling operator and data. We have applied seismic inversion to a variety of applications including (1) full waveform inversion for estimating rock properties within a hydrocarbon reservoir, (2) joint inversion of seismic travel time and gravity data for delineating plate boundaries and crustal structure offshore Taiwan, (3) crustal velocity structure from waveform inversion of shear-couple PL waves, and (4) anisotropic structure of the core-mantle transition zone. Although all these applications make use of the same forward modeling algorithms and optimization routines, they are carefully designed to address the disparate scale and data types. For example, a semi-analytic approach for differential seismogram calculation is used for full waveform inversion in the first application while arc-parameter basis functions are used to represent the subsurface in the joint inversion of seismic and gravity data. Forward caculation is tailored to rapidly compute the response of the crustal structure for the shear coupled PL waves. To model anisotropic D" layer, we pre-compute the respose of the crust and the mantle layers (without D") for use in each iteration of the waveform inversion. In addition to deriving best fit models we also estimate parameter uncertainty and tradeoff between different parametes using Bayesian statistics. Such results are interpreted in terms of the physics of the problem being investigated.
UR: http://www.ig.utexas.edu
DE: 3230 Numerical solutions
DE: 3260 Inverse theory
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2005 Joint Assembly