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

Claim 0:
1. A system for obtaining a high SNR seismic while-drilling data received in response to a drilling device acting as a seismic source and using the high SNR seismic while-drilling data to construct a reliable velocity profile of a geological site, at which a main well is being drilled using the drilling device, the system comprising:
at least one additional well hole positioned in the vicinity of the main well that extends from a surface to a predetermined depth which exceeds 30 meters below the surface;
at least one distributed acoustic fiber optic cable deployed vertically in each well hole, at least a portion of the fiber optic cable being positioned at least at the predetermined depth;
a seismic data recording station positioned on the at least one fiber optic cable positioned at the predetermined depth;
wherein one or more of the at least one fiber optic cable includes a first recording station positioned at a first depth, and a second recording station positioned at a second depth of the cable; and
a processor configured to:
receive first seismic data sensed in response to the drilling device positioned at a first source depth and recorded at the first recording station, and second seismic data sensed in response to the drilling device at the first source depth and recorded at the second recording station; and
cross-correlate the first seismic data with the second seismic data to generate a first cross-correlation;
wherein the recording station on the at least one fiber optic cable is operative to record a high SNR seismic velocity profile obtained from analysis of the seismic data obtained using the at least one fiber optic cable from which near-surface hazards at the geological complexities can be assessed.