公开(公告)号：US20250004153A1

公开(公告)日：2025-01-02

申请号：US18343668

申请日：2023-06-28

Applicant: ARAMCO SERVICES COMPANY

Inventor： Vladimir Kazei ,  Aleksei Titov ,  Andrey Bakulin

IPC: G01V1/22 ,  E21B7/04 ,  E21B44/00 ,  E21B49/00 ,  G01V1/50

Abstract: Systems and methods are presented for determining a calibrated vertical seismic profile (VSP) with a distributed acoustic sensing (DAS) system in a borehole. The methods include obtaining a density log and an acoustic slowness log for the borehole; determining a first impedance, a DAS impedance from well log (DIL) curve, from the density log and the acoustic slowness log; obtaining a VSP dataset in the borehole; for each of the plurality of gauge lengths: determining a second impedance, a DAS from vibrations (DIV) curve, from the VSP dataset for the plurality of gauge lengths, and determining a fit between the DIV curves and the DIL curve by using a misfit functional for each of a plurality of depth adjustments. The method further includes determining the calibrated VSP by applying a preferred depth adjustment to the VSP dataset.