Patent ID: 11880007
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A method of obtaining high SNR seismic while-drilling data and retrieving a velocity profile of a geological site having a main well and at least one additional well hole located in the vicinity of the main well, the seismic profile being obtained from seismic waves generated by a drilling device located at the main well, the method comprising:
deploying at least one distributed acoustic fiber optic cable vertically in the at least one additional well hole, at least a portion of the fiber optic cable being positioned at a predetermined depth exceeding 30 meters below the surface;
receiving seismic data at a recording station positioned on the at least one fiber optic cable at at least the predetermined depth;
recording seismic data at first and second recording depths on the fiber optic cable; and
at a processor:
generating a high SNR seismic while-drilling data from which a velocity profile is constructed;
determining a presence of near surface hazards from the generated high SNR seismic while-drilling data;
receiving first seismic data sensed in response to the drilling device positioned at a first source depth and recorded at a first recording depth, and second seismic data sensed in response to the drilling device at the first source depth and recorded at the second recording depth; and
cross-correlating the first and second seismic data, generating a first cross-correlation.