See more from this Division: General Discipline Sessions
See more from this Session: Geophysics/Tectonophysics/Seismology
Abstract:
Acquisition of surface-based seismic data is important in subsurface characterization. Seismic data are highly desirable for determining subsurface suitability of a proposed site, building conceptual and numerical reservoir models, and for time-lapse monitoring of injected CO2. Traditional surface seismic methods have had little success in obtaining usable data within basalt layers, as a consequence of severe energy scattering and interferring wave modes that degrade image quality or misplace geologic features. An innovative multicomponent (3C) 2D seismic swath experiment at the Wallula site is providing a long-sought breakthrough in improving seismic signal/noise and in imaging subsurface basalt geology. Processing of the 6.5 km, 5 line 3C swath included building an elastic wavefield model and identifying and separating seismic wave modes. The resulting P-P seismic images demonstrate a succession of unfaulted basalt layers suitable for wellbore characterization and testing. Our 3C2D seismic experiment produced successful surface-based seismic imaging of intra-basalt geology and provides a critical key for development of seismic technologies for sequestration of greenhouse CO2 in basalts.
See more from this Division: General Discipline Sessions
See more from this Session: Geophysics/Tectonophysics/Seismology