US 12,461,266 B2
System and method for seismic imaging around wellbores
Alexei Olegovich Bolshakov, Pearland, TX (US); and Kristoffer Thomas Walker, Kingwood, TX (US)
Assigned to CHEVRON U.S.A. INC., San Ramon, CA (US)
Filed by Chevron U.S.A. Inc., San Ramon, CA (US)
Filed on Jun. 7, 2023, as Appl. No. 18/331,102.
Prior Publication US 2024/0411042 A1, Dec. 12, 2024
Int. Cl. G01V 1/48 (2006.01)
CPC G01V 1/48 (2013.01) [G01V 2200/16 (2013.01); G01V 2210/51 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of processing seismic data, the method comprising:
a. obtaining seismic data, wherein the seismic data was acquired throughout a region of interest with a plurality of azimuthal receiver elements of a logging-while-drilling tool while a drill bit is drilling a wellbore;
b. decomposing the seismic data into monopole and dipole modes to obtain a monopole mode and a dipole mode;
c. cross-correlating each receiver pair of the monopole mode and of the dipole mode to generate a monopole waveform and a dipole waveform;
d. identifying a time of direct arrival of acoustic energy from the drill bit and applying bulk time shift for each of the monopole waveform and the dipole waveform;
e. stacking corresponding waveforms from the bulk time shift to improve signal-to-noise ratio to generate a stacked monopole waveform and a stacked dipole waveform;
f. processing the stacked monopole waveform and the stacked dipole waveform to isolate reflected arrivals;
g. performing migration on the reflected arrivals to obtain a monopole migrated image and a dipole migrated image; and
h. classifying the interface as either a fracture or an impedance contrast using the monopole migrated image and the dipole migrated image.