Eighth International Conference on Ground Penetrating Radar, 2000
ABSTRACT GPR surveys were conducted in the New Madrid seismic zone in central US -- an area used ... more ABSTRACT GPR surveys were conducted in the New Madrid seismic zone in central US -- an area used to be considered unsuitable for GPR applications. The purposes of these surveys are to correlate geological features revealed by trenching and GPR responses and consequently lending a roadway to search for subsurface paleoliquefaction features such as sand dikes and sand blows in a relatively silty and clayey country soil environment. GPR surveys using 400, 100 and 25 MHz antennas were conducted at three sites at Haynes, Arkansas, Dillarhunty, and Sikeston Ridge Missouri. Comparison with shallow shear-wave seismic surveys at the Sikeston Ridge site reveals similar subsurface features in different deformation features at different depths (10 m vs 100 m) along the western scarp of the Ridge. Detailed study to analyze GPR registration of subsurface liquefaction features will be reported at the conference.
SEG Technical Program Expanded Abstracts 2008, 2008
True geometry tomography for velocity model building with applications to WATS seismic data Chaog... more True geometry tomography for velocity model building with applications to WATS seismic data Chaoguang Zhou, Jaime Ramos-Martínez, Sonny Lin, Junru Jiao and ... At the tomography stage, a ray tracer is used to trace specular rays from the image points to the surface to set up ...
SEG Technical Program Expanded Abstracts 2009, 2009
Preview Automatically picking on 3D volumes and fast convergence to variable wavelength are two m... more Preview Automatically picking on 3D volumes and fast convergence to variable wavelength are two major challenges in grid-based reflection tomography. This paper discusses a multi-parameter controlled automatically picking method that, when integrated with a fast beam ...
SEG Technical Program Expanded Abstracts 2011, 2011
... John Sherwood, Junru Jiao*, Hans Tieman, Kevin Sherwood, Chaoguang Zhou, Sonny Lin and Sverre... more ... John Sherwood, Junru Jiao*, Hans Tieman, Kevin Sherwood, Chaoguang Zhou, Sonny Lin and Sverre Brandsberg-Dahl, Petroleum Geo-Services Summary ... The spatial dip components of the wavelet with respect to time enable very efficient ray tracing. ...
A nonlinear tomographic inversion method that uses first-arrival travel-time and amplitude-spectr... more A nonlinear tomographic inversion method that uses first-arrival travel-time and amplitude-spectra information from cross-hole radar measurements was developed to simultaneously reconstruct electromagnetic velocity and attenuation distribution in earth materials. Inversion methods were developed to analyze single cross-hole tomography surveys and differential tomography surveys. Assuming the earth behaves as a linear system, the inversion methods do not require estimation of source radiation pattern, receiver coupling, or geometrical spreading. The data analysis and tomographic inversion algorithm were applied to synthetic test data and to cross-hole radar field data provided by the US Geological Survey (USGS). The cross-hole radar field data were acquired at the USGS fractured-rock field research site at Mirror Lake near Thornton, New Hampshire, before and after injection of a saline tracer, to monitor the transport of electrically conductive fluids in the image plane.Results from the synthetic data test demonstrate the algorithm computational efficiency and indicate that the method robustly can reconstruct electromagnetic (EM) wave velocity and attenuation distribution in earth materials. The field test results outline zones of velocity and attenuation anomalies consistent with the finding of previous investigators; however, the tomograms appear to be quite smooth. Further work is needed to effectively find the optimal smoothness criterion in applying the Tikhonov regularization in the nonlinear inversion algorithms for cross-hole radar tomography.
SEG Technical Program Expanded Abstracts 2010, 2010
Velocity model building strategy for multi-azimuth surveys Junru Jiao*, Chaoguang Zhou, Sonny Lin... more Velocity model building strategy for multi-azimuth surveys Junru Jiao*, Chaoguang Zhou, Sonny Lin, Dennis van der Burg, and Sverre Brandsberg-Dahl, Petroleum Geo ... To set up the linear system, we trace many reflection ray pairs from a subsurface reflector to the surface. ...
Eighth International Conference on Ground Penetrating Radar, 2000
ABSTRACT GPR surveys were conducted in the New Madrid seismic zone in central US -- an area used ... more ABSTRACT GPR surveys were conducted in the New Madrid seismic zone in central US -- an area used to be considered unsuitable for GPR applications. The purposes of these surveys are to correlate geological features revealed by trenching and GPR responses and consequently lending a roadway to search for subsurface paleoliquefaction features such as sand dikes and sand blows in a relatively silty and clayey country soil environment. GPR surveys using 400, 100 and 25 MHz antennas were conducted at three sites at Haynes, Arkansas, Dillarhunty, and Sikeston Ridge Missouri. Comparison with shallow shear-wave seismic surveys at the Sikeston Ridge site reveals similar subsurface features in different deformation features at different depths (10 m vs 100 m) along the western scarp of the Ridge. Detailed study to analyze GPR registration of subsurface liquefaction features will be reported at the conference.
SEG Technical Program Expanded Abstracts 2008, 2008
True geometry tomography for velocity model building with applications to WATS seismic data Chaog... more True geometry tomography for velocity model building with applications to WATS seismic data Chaoguang Zhou, Jaime Ramos-Martínez, Sonny Lin, Junru Jiao and ... At the tomography stage, a ray tracer is used to trace specular rays from the image points to the surface to set up ...
SEG Technical Program Expanded Abstracts 2009, 2009
Preview Automatically picking on 3D volumes and fast convergence to variable wavelength are two m... more Preview Automatically picking on 3D volumes and fast convergence to variable wavelength are two major challenges in grid-based reflection tomography. This paper discusses a multi-parameter controlled automatically picking method that, when integrated with a fast beam ...
SEG Technical Program Expanded Abstracts 2011, 2011
... John Sherwood, Junru Jiao*, Hans Tieman, Kevin Sherwood, Chaoguang Zhou, Sonny Lin and Sverre... more ... John Sherwood, Junru Jiao*, Hans Tieman, Kevin Sherwood, Chaoguang Zhou, Sonny Lin and Sverre Brandsberg-Dahl, Petroleum Geo-Services Summary ... The spatial dip components of the wavelet with respect to time enable very efficient ray tracing. ...
A nonlinear tomographic inversion method that uses first-arrival travel-time and amplitude-spectr... more A nonlinear tomographic inversion method that uses first-arrival travel-time and amplitude-spectra information from cross-hole radar measurements was developed to simultaneously reconstruct electromagnetic velocity and attenuation distribution in earth materials. Inversion methods were developed to analyze single cross-hole tomography surveys and differential tomography surveys. Assuming the earth behaves as a linear system, the inversion methods do not require estimation of source radiation pattern, receiver coupling, or geometrical spreading. The data analysis and tomographic inversion algorithm were applied to synthetic test data and to cross-hole radar field data provided by the US Geological Survey (USGS). The cross-hole radar field data were acquired at the USGS fractured-rock field research site at Mirror Lake near Thornton, New Hampshire, before and after injection of a saline tracer, to monitor the transport of electrically conductive fluids in the image plane.Results from the synthetic data test demonstrate the algorithm computational efficiency and indicate that the method robustly can reconstruct electromagnetic (EM) wave velocity and attenuation distribution in earth materials. The field test results outline zones of velocity and attenuation anomalies consistent with the finding of previous investigators; however, the tomograms appear to be quite smooth. Further work is needed to effectively find the optimal smoothness criterion in applying the Tikhonov regularization in the nonlinear inversion algorithms for cross-hole radar tomography.
SEG Technical Program Expanded Abstracts 2010, 2010
Velocity model building strategy for multi-azimuth surveys Junru Jiao*, Chaoguang Zhou, Sonny Lin... more Velocity model building strategy for multi-azimuth surveys Junru Jiao*, Chaoguang Zhou, Sonny Lin, Dennis van der Burg, and Sverre Brandsberg-Dahl, Petroleum Geo ... To set up the linear system, we trace many reflection ray pairs from a subsurface reflector to the surface. ...
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