Up: Cole: A drill-bit source
Previous: SOURCE SIGNAL ESTIMATION AND
Direct arrivals from the drill bit can be seen clearly
in the data recorded during a ``quiet'' period, when
all pumps within the array were turned off.
Stacking these arrivals over the appropriate moveout
trajectory gives a source signal estimate that can
be used in crosscorrelation to enhance the drill-bit
signal. Searching the crosscorrelated data for
energy sources may reveal scattering of drill bit
energy off subsurface structure.
Stanford Exploration Project