KEGS Ottawa December Meeting

   

Full spectrum Falcon AGG and the FTG Plus 

 

Tianyou Chen, 
CGG 

Tuesday, December 20th 
4:30 p.m.

Harrison Hall
Room 177
601 Booth Street

 

Abstract  

The full spectrum airborne gravity system improves AGG data quality in both ends of the spectrum. Three major developments provide improvements in the spatial resolution, long wavelength response and noise reduction in airborne gravity gradiometer data. The world’s first commercial strap down gravimeter, sGrav, has achieved the same levels of data quality at long wavelengths as stabilized platform systems. With a repeatability of 0.71 mGal RMS at 300 s filtering, it is ideally suited to augment the long wavelength airborne gravity gradiometer data. The sGrav data is incorporated into the airborne gravity gradiometer processing stream, which has advantages for conforming gravity gradiometer data to any regional gravity data.  Processing gravity gradient data routinely involves low-pass filtering which limits the spatial resolution. A new processing method increases this resolution by splitting the acquisition noise from the geologic noise and then removing the acquisition noise. This method has reduced noise amplitude densities, in some cases by 50%. The FTG Plus has a sensitivity goal of  0.25 E2/Hz in a bandwidth from 0.0001 to 5Hz. This represents a factor of 20 improvement in sensitivity and 10 in bandwidth of the best currently operating gravity gradiometers (Dransfield, 2016). 0.25 E2/Hz

 

Biography 

Tianyou Chen is a senior research scientist at CGG in Toronto, Canada. He holds a PhD in geosciences from the University of Texas at Dallas and has more than 20 years of experience in geophysical exploration, of which more than 15 years in airborne geophysics. As a staff geophysicist in Micro-g LaCoste (2002 – 2006), he worked on 4D high accuracy absolute gravity surveys in water-flood monitoring and was involved in the development and testing of the first TAGS airborne gravity system. His research includes airborne time and frequency domain EM, airborne gravity and airborne gravity gradiometry. He worked on new techniques for ultra-broadband EM systems, the MULTIPULSE™ technology and airborne IP. His most recent works include Fourier Transform and Equivalent Source technology evaluation in transforming Falcon™ AGG gradient data into full tensor gravity gradients and vertical gravity; he also works on the data processing techniques related to the FTG Plus being developed.