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1. (WO2014191427) HIGH RESOLUTION ESTIMATION OF ATTENUATION FROM VERTICAL SEISMIC PROFILES

Pub. No.:    WO/2014/191427    International Application No.:    PCT/EP2014/060988
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Wed May 28 01:59:59 CEST 2014
IPC: G01V 1/30
G01V 1/42
Applicants: STATOIL PETROLEUM AS
Inventors: CARTER, Andrew James
Title: HIGH RESOLUTION ESTIMATION OF ATTENUATION FROM VERTICAL SEISMIC PROFILES
Abstract:
Method of obtaining an attenuation model estimate for a vertical seismic profile (VSP), comprising: receiving a vertical seismic profile dataset, the VSP dataset having been generated by recording a wavefield at a plurality of depth levels; building an estimate of a plurality of transfer functions of the wavefield between respective pairs of depth levels based on the VSP dataset, where the transfer function is sensitive to attenuation; producing a plurality of corrected transfer functions between the respective pairs of depth levels by modeling local interference of the wavefield from interfaces near each of the depth levels using information comprising measured well log and/or borehole information and correcting the estimated transfer functions for this interference; choosing and fitting an attenuation law to the corrected transfer functions; outputting an attenuation model.