Title:
【発明の名称】反響抑制のための改良された方法
Document Type and Number:
Japanese Patent JPH08501395
Kind Code:
A
Abstract:
A method for reducing the effects of reverberation on noisy seismic wavefields recorded from within a moisture-laden environment. The wavefield manifests itself as a pressure signature and a velocity signature that contains an embedded nose signature. The pressure signature is adaptively filtered and subtractively combined with the velocity signature to isolate a nearly pure noise signature. The nearly pure noise signature is added back to the original velocity signature with opposite sign to clear away the embedded noise, leaving a refined velocity signature. The refined velocity signature iteratively is scaled and summed with the pressure signature, incrementing the scale factor at each iteration and autocorrelating the sum. A coefficient of convergence is calculated after each summation. The coefficient of convergence that most closely approaches unity identifies the preferred scale factor.
Inventors:
Drago set, William, Etch., Junior
Application Number:
JP50641395A
Publication Date:
February 13, 1996
Filing Date:
July 13, 1994
Export Citation:
Assignee:
WESTERN ATLAS INT INC (US)
International Classes:
G01V1/28; G01P3/42; G01S7/527; G01S7/536; G01V1/36; G01V1/38; G06F17/00; G10K11/178; (IPC1-7): G01V1/38; G01V1/36
Attorney, Agent or Firm:
Masao Okabe (9 others)