Journal
GEOPHYSICAL PROSPECTING
Volume 60, Issue 1, Pages 1-17Publisher
WILEY
DOI: 10.1111/j.1365-2478.2011.00957.x
Keywords
Mining; Passive method; Time reversal mirrors
Categories
Funding
- American Chemical Society
- King Abdullah University of Science and Technology
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Time reversal mirrors can be used to backpropagate and refocus incident wavefields to their actual source location, with the subsequent benefits of imaging with high-resolution and super-stacking properties. These benefits of time reversal mirrors have been previously verified with computer simulations and laboratory experiments but not with exploration-scale seismic data. We now demonstrate the high-resolution and the super-stacking properties in locating seismic sources with field seismic data that include multiple scattering. Tests on both synthetic data and field data show that a time reversal mirror has the potential to exceed the Rayleigh resolution limit by factors of 4 or more. Results also show that a time reversal mirror has a significant resilience to strong Gaussian noise and that accurate imaging of source locations from passive seismic data can be accomplished with traces having signal-to-noise ratios as low as 0.001. Synthetic tests also demonstrate that time reversal mirrors can sometimes enhance the signal by a factor proportional to the square root of the product of the number of traces, denoted as N and the number of events in the traces. This enhancement property is denoted as super-stacking and greatly exceeds the classical signal-to-noise enhancement factor of . High-resolution and super-stacking are properties also enjoyed by seismic interferometry and reverse-time migration with the exact velocity model.
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