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Results for “geophysical monitoring”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Camera with a view of an instrument field (a1-level)
Camera with a view of an instrument field
Camera to view southeast scene at BNF tower site from 4m height, processed into a movie (a1-level)
Camera to view southeast scene at BNF tower site from 4m height, processed into a movie
Camera to view southwest scene at BNF tower site from 4m height (a1-level)
Camera to view southwest scene at BNF tower site from 4m height
Camera to view southeast scene at BNF tower site from 4m height (a1-level)
Camera to view southeast scene at BNF tower site from 4m height
Camera to view southwest scene at BNF tower site from 4m height, processed into a movie (a1-level)
Camera to view southwest scene at BNF tower site from 4m height, processed into a movie
Camera facing SW to monitor ocean from AERI at kcg:M1 (a1-level)
Camera facing SW to monitor ocean from AERI at kcg:M1
Camera facing NW to monitor ocean from AERI at kcg:M1 (a1-level)
Camera facing NW to monitor ocean from AERI at kcg:M1
Stress analysis using direct-S wavelets produced by a vertical vibrator
We have determined how to extract the azimuth of maximum horizontal stress (SHmax) in deep rocks by doing a simple 360° mathematical rotation of a downgoing direct-S wavelet generated at the baseplate of a surface-based vertical vibrator. We worked with direct-S wavelets that travel through stressed rocks to a deep horizontal vertical seismic profile (VSP) geophone. We find that the azimuth where a polarity reversal occurs in mathematical rotations of this downgoing direct-S wavelet defines the azimuth of the SHmax in the overlying rocks. We tested this direct-S wavelet rotation method for determining the SHmax azimuth at a site in the Illinois Basin using legacy VSP data acquired in 2013. SHmax azimuths indicated by this simple wavelet-rotation method were determined when vertical vibrators were stationed at zero offset, at far offset, and at different azimuths around a VSP receiver well. These VSP-based SHmax azimuths agreed with the azimuth of the SHmax found by traditional minifrac tests in the VSP receiver well. This simple VSP data analysis procedure for detecting the azimuth of maximum horizontal stress has never, to our knowledge, been reported or discussed in the geophysical literature. This technical finding should be of interest to the worldwide geophysical community, especially to people who need to monitor how stress fields shift when fluids are injected into, or extracted from, deep porous reservoirs.