seismic; imaging; laboratory; modeling; waveform; inversion; anisotropy
van Manen Dirk-Jan, Vasmel Marlies, Greenhalgh Stewart, Robertsson Johan (2015), Broadband cloaking and holography using exact boundary conditions, in Journal of the Acoustical Society of America
, 137(6), EL415.
Maurer Hansruedi, Nuber Andre, Manukyan Edgar, Greenhalgh Stewart (2015), Seismic full waveform inversion for characterizing near-surface structures: a review of potential problems and possible solutions, in 77th EAGE Conference and Exhibition, Workshop 10 "Full Waveform Inversion for Near Surface Character
Mo Yike, Greenhalgh Stewart, Robertsson Johan, Karaman Hakki (2015), The devleopment and testing of a 2D laboratory seismic modelling system for heterogeneous structure investigations, in Journal of Applied Geophysics
, 116, 224-235.
Bai Chao-ying, Li Xiao-Ling, Huang Guo-Jiau, Greenhalgh Stewart (2014), 3-D simultaneous inversion for velocity and refelctor geometry using multi-phase Fresnel volume rays, in Pure and Applied Geophysics
, 171, 1089-1105.
Huang Guo-Jiau, Bai Chao-ying, Li Xiao-Ling, Greenhalgh Stewart (2014), 3-D simultaneous inversion for velocity and reflector geometry using multiple classes of arrivals in a spherical co-ordinate frame, in Journal of Seismology
, 18(1), 123-135.
Greenhalgh Stewart, Liu Xu, Zhou Bing (2014), A model for determination of effective permeability from acoustic wavespeed and attenuation in a rigid two-phase porous medium, in Near Surface Geophysics
, 12, 391-404.
Mo Yike, Greenhalgh Stewart, Robertsson Johan, Karaman Hakki (2014), Distorting effects of the near-surface layer on seismic imaging - physical model investigations, in EAGE Near Surface 2014
Liu Xu, Greenhalgh Stewart (2014), Reflection and transmission coefficients for an incident plane shear wave at an interface separating two dissimilar poroelastic solids, in Pure and Applied Geophysics
, 171, 2111-2127.
Auer Ludwig, Nuber Andre, Greenhalgh Stewart, Maurer Hansruedi, Marelli Stefano (2013), A critical appraisal of asymptotic 3D-to-2D data transformation in seismic full waveform inversion, in Geophysics
, 78(6), R235-R247.
Vasmel Marlies, Maurer Hansruedi, Greenhalgh Stewart (2013), Evaluation of anelastic effects on seismic full waveform inversion, in 75th EAGE Conference
Meles Giovanni, Greenhalgh Stewart, Maurer Hansruedi, Green Alan (2013), Image appraisal of full waveform inverted GPR data, in PIERS 2013
Bai Chao-ying, Huang Guo-Jiau, Li Xiao-Ling, Greenhalgh Stewart (2013), Ray tracing of multiple transmitted/reflected/converted waves in 2D/3D layered anisotropic TTI media and application to crosswell traveltime tomography, in Geophysical Journal International
, 195, 1068-1087.
Meles Giovanni, Greenhalgh Stewart, Maurer Hansruedi, Green Alan (2013), Some ideas yet unattempted in georadar full waveform inversion, in PIERS 2013
Meles Giovanni, Greenhalgh Stewart, Green Alan, Maurer Hansruedi, van der Kruk Jan (2012), GPR full waveform sensitivity and resolution analysis using an FDTD adjoint method, in IEEE Transactions on Geoscience and Remote Sensing
, 50(5), 1881-1896.
Greenhalgh Stewart, Liu Xu, Zhou Bing (2012), Velocity and attenuation dispersion relations for the effective Biot model: total field formulation, in Near Surface Geophysics
, 10, 197-206.
This project has as its primary goal the development of the next generation of seismic imaging capability for mapping the subsurface remotely. The application is mainly towards resource exploration and development where material anisotropy and poroelasticity are prevalent, but often overlooked in current seismic imaging strategies. The plan is to utilize the full waveform information contained in the seismograms so as to obtain high resolution images of complete elastic properties. For reasons of computational tractability the full waveform inversion algorithms to be devised will be 2.5D, which means the geological structure is assumed to be two dimensional but the wave propagation is three dimensional. The project will build on our considerable past experience and accomplishments in seismic exploration, which include contributions to modelling, inversion, imaging, instrumentation and field procedures. A distinguishing feature of this proposal is to construct a two-dimensional ultrasonic laboratory model facility, which can be used to simulate a variety of interesting and relevant geological structures. The data obtained from the model experiments will be analysed and inverted to assess the resolution limits and reliability of the new algorithms. The scale model system will also be used (along with numerical modelling) to investigate a variety of problems in seismic wave propagation, especially the waveguiding effects of low velocity layers such as gas reservoirs and coal seams. The goal is to exploit such characteristics and build low cost, novel imaging systems for fault delineation, which is critical in petroleum field development and coal mining. The new full waveform elastic anisotropic inversion code will also be applied to field data to be supplied by collaborators from industry, as well as to data we have collected ourselves in the recent past in connection with near surface investigations for engineering and environmental projects. Supporting theoretical and numerical model studies will be undertaken to help interpret the field data and to compare with the laboratory experiments.Given the challenge and scope of the project, it will be necessary to hire two PhD students and one postdoctoral fellow. One student will have primary responsibility, along with a technician and the postdoctoral researcher, for assembling the laboratory modelling system and electronics and performing the physical model experiments. The other student, along with the postdoc, will concentrate on developing the full waveform anisotropic inversion scheme and testing it against the laboratory models and other simplified algorithms. The two students, together with the postdoctoral fellow, will perform the field data inversions. The project has the potential to revolutionize the way the subsurface can be visualized with sound and the resulting images interpreted in a more meaningful manner.