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Dispersion analysis for waves propagated in fractured media

Abstract

Dispersion of velocity is defined as a variation of the phase velocity with frequency. This paper describes the dispersion analysis of compressional body waves propagated in the heterogeneous fractured media. The new method proposed and discussed here permitted the evaluation of the variation in P wave arrival with frequency. For this processing method, any information about the attenuation of the medium are not required, and only an assumption of weak heterogeneity is important. It was shown that different mechanisms of dispersion can be distinguished and its value can be quantitatively estimated. Although the frequency used in this study was lower than those in most previous experiments reported in literature, the evaluated dispersion was large. It was suggested that such a large dispersion may be caused by the velocity structure of the media studied and by frequency dependent processes in a highly fractured zone. It was demonstrated that the present method can be used in the evaluation of subsurface fracture systems or characterization of any kind of heterogeneities. 10 refs., 6 figs.
Authors:
Lesniak, A; Niitsuma, H [1] 
  1. Tohoku University, Sendai (Japan). Faculty of Engineering
Publication Date:
May 01, 1996
Product Type:
Conference
Report Number:
CONF-9605233-
Reference Number:
SCA: 150301; 440700; PA: NEDO-96:913519; EDB-96:170144; SN: 96001687126
Resource Relation:
Conference: 94. SEGJ (The Society of Exploration Geophysicists of Japan) Conference, Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai, Tokyo (Japan), 15-17 May 1996; Other Information: PBD: May 1996; Related Information: Is Part Of Proceedings of the 94th SEGJ (The Society of Exploration Geophysicists of Japan) Conference; PB: 475 p.; Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai koen ronbunshu
Subject:
15 GEOTHERMAL ENERGY; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; VELOCITY; DISPERSIONS; PHASE VELOCITY; FREQUENCY DEPENDENCE; P WAVES; GEOLOGIC FRACTURES; COMPRESSIBLE FLOW; WAVE PROPAGATION; GEOTHERMAL SYSTEMS; FRACTURED RESERVOIRS
OSTI ID:
395556
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE97709027; TRN: 96:913519
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97709027
Submitting Site:
NEDO
Size:
pp. 411-415
Announcement Date:
Dec 02, 1996

Citation Formats

Lesniak, A, and Niitsuma, H. Dispersion analysis for waves propagated in fractured media. Japan: N. p., 1996. Web.
Lesniak, A, & Niitsuma, H. Dispersion analysis for waves propagated in fractured media. Japan.
Lesniak, A, and Niitsuma, H. 1996. "Dispersion analysis for waves propagated in fractured media." Japan.
@misc{etde_395556,
title = {Dispersion analysis for waves propagated in fractured media}
author = {Lesniak, A, and Niitsuma, H}
abstractNote = {Dispersion of velocity is defined as a variation of the phase velocity with frequency. This paper describes the dispersion analysis of compressional body waves propagated in the heterogeneous fractured media. The new method proposed and discussed here permitted the evaluation of the variation in P wave arrival with frequency. For this processing method, any information about the attenuation of the medium are not required, and only an assumption of weak heterogeneity is important. It was shown that different mechanisms of dispersion can be distinguished and its value can be quantitatively estimated. Although the frequency used in this study was lower than those in most previous experiments reported in literature, the evaluated dispersion was large. It was suggested that such a large dispersion may be caused by the velocity structure of the media studied and by frequency dependent processes in a highly fractured zone. It was demonstrated that the present method can be used in the evaluation of subsurface fracture systems or characterization of any kind of heterogeneities. 10 refs., 6 figs.}
place = {Japan}
year = {1996}
month = {May}
}