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Nonlinear effect in vibroseis data; Vibroseis kiroku ni oite mitomerareru hisenkei koka

Abstract

This paper describes nonlinear effect recognized in Vibroseis data. Harmonics is a wave of frequency in integer factors generated in association with basic sweep vibrated by Vibroseis. Harmonics is generated because vibration in the vicinity of seismic source contains nonlinear terms. Seismic exploration using the reflection method often discusses propagation of seismic waves hypothesized as a linear phenomenon. Vibroseis data analysis, however, requires evaluation of the effect of the harmonics on accuracy. Vibroseis investigation measures may be taken by eliminating n-order harmonics by using the phase control method, and generating seismic source sweep in which the phase is shifted by 180/(n-1) each time in order to leave the basic sweep. Methods to increase the sweep length include a method to expel strain to a location outside the range of the subject travel time. Up-sweep (a sweep changing from low frequencies to higher frequencies) is also a means capable of avoiding harmonics effects. Vibroseis investigations currently performed adopt this method frequently because of it having little technological and economic problems. 10 refs., 3 figs.
Authors:
Saeki, T [1] 
  1. Japan National Oil Corp., Tokyo (Japan)
Publication Date:
May 27, 1997
Product Type:
Conference
Report Number:
CONF-9705167-
Reference Number:
SCA: 440700; 150301; 580000; PA: NEDO-97:912213; EDB-97:120313; SN: 97001846505
Resource Relation:
Conference: 96. SEGJ conference, Butsuri tansa gakkai dai 96 kai (1997 nendo shunki) gakujutsu koenkai, Tokyo (Japan), 27-29 May 1997; Other Information: PBD: 27 May 1997; Related Information: Is Part Of Proceeding of the 96th (spring, fiscal 1997) SEGJ Conference; PB: 502 p.; Butsuri tansa gakkai dai 96 kai (1997 nendo shunki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; SEISMIC SURVEYS; REFLECTION; SEISMIC SOURCES; HARMONIC GENERATION; NONLINEAR PROBLEMS; WAVE FORMS; FREQUENCY DEPENDENCE; SEISMIC WAVES; WAVE PROPAGATION; ACCURACY; CONTROL; POWER FACTOR; WAVELENGTHS; COST
OSTI ID:
522614
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97770262; TRN: 97:912213
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97770262
Submitting Site:
NEDO
Size:
pp. 56-59
Announcement Date:
Sep 29, 1997

Citation Formats

Saeki, T. Nonlinear effect in vibroseis data; Vibroseis kiroku ni oite mitomerareru hisenkei koka. Japan: N. p., 1997. Web.
Saeki, T. Nonlinear effect in vibroseis data; Vibroseis kiroku ni oite mitomerareru hisenkei koka. Japan.
Saeki, T. 1997. "Nonlinear effect in vibroseis data; Vibroseis kiroku ni oite mitomerareru hisenkei koka." Japan.
@misc{etde_522614,
title = {Nonlinear effect in vibroseis data; Vibroseis kiroku ni oite mitomerareru hisenkei koka}
author = {Saeki, T}
abstractNote = {This paper describes nonlinear effect recognized in Vibroseis data. Harmonics is a wave of frequency in integer factors generated in association with basic sweep vibrated by Vibroseis. Harmonics is generated because vibration in the vicinity of seismic source contains nonlinear terms. Seismic exploration using the reflection method often discusses propagation of seismic waves hypothesized as a linear phenomenon. Vibroseis data analysis, however, requires evaluation of the effect of the harmonics on accuracy. Vibroseis investigation measures may be taken by eliminating n-order harmonics by using the phase control method, and generating seismic source sweep in which the phase is shifted by 180/(n-1) each time in order to leave the basic sweep. Methods to increase the sweep length include a method to expel strain to a location outside the range of the subject travel time. Up-sweep (a sweep changing from low frequencies to higher frequencies) is also a means capable of avoiding harmonics effects. Vibroseis investigations currently performed adopt this method frequently because of it having little technological and economic problems. 10 refs., 3 figs.}
place = {Japan}
year = {1997}
month = {May}
}