公开(公告)号：US20240411042A1

公开(公告)日：2024-12-12

申请号：US18331102

申请日：2023-06-07

Applicant: Chevron U.S.A. Inc.

Inventor： Alexei Olegovich Bolshakov ,  Kristoffer Thomas Walker

IPC: G01V1/48

Abstract: A method is described for method of processing seismic data including obtaining seismic data, wherein the seismic data was acquired with a plurality of azimuthal receiver elements of a logging-while-drilling tool while a drill bit is drilling a wellbore; decomposing the seismic data into monopole and dipole modes; cross-correlating each receiver pair of the monopole mode and of the dipole mode to generate monopole and dipole waveforms; identifying a time of direct arrival of acoustic energy from the drill bit and applying bulk time shift for the waveforms; stacking corresponding waveforms from the bulk time shift to improve signal-to-noise ratio; processing the stacked monopole and dipole waveform to isolate reflected arrivals; performing migration to obtain a monopole migrated image and a dipole migrated image; and classifying the interface as either a fracture or an impedance contrast. The method is executed by a computer system.