Utilisation Combinee Des Ondes Longitudinales Et Transversales en Sismique Reflexion*

Polškov, M.K.; Brodov, L.Ju.; Mironova, L.V.; Michon, D.; Garotta, Robert; Layotte, P. C.; Coppens, F.

doi:10.1111/j.1365-2478.1980.tb01220.x

Cited by 18 publications

(7 citation statements)

References 4 publications

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“…5). In this experiment, the observation of The study of many t-d curves for waves reflected from the top and bottom of the lowvelocity layer revealed a significant difference between the velocities obtained in a borehole, VsL, and SH velocities determined from the reflection t-d curves (Polshkov et al 1980). Note that velocities determined from t-d curves agree, in the case of an elliptical characteristic of ray velocities, with Vli in an anisotropic medium (Gurvich 1940).…”

Section: Anisotropy In Clay Embedded In Carbonatesmentioning

confidence: 77%

Some results of the experimental study of seismic anisotropy of sedimentary rocks using different types of waves

Brodov¹,

Evstifeyev²,

Karus³

et al. 1984

Geophysical Journal International

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The presence of anisotropy has been established and its parameters have been estimated by the combined use of compressional and shear, SHand SV-waves. Anisotropy has been studied in argillaceous and carbonate rocks to a depth of 2 km by combined surface and borehole observations along longitudinal and non-longitudinal vertical lines with linear shot lines. Anisotropy in carbonate rocks has been found to be a function of their heterogeneity, ordered fracturing and the amount of clay. The highest' anisotropy has been found in argillaceous rocks irrespective of their depth and degree of heterogeneity.

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Section: Anisotropy In Clay Embedded In Carbonatesmentioning

confidence: 77%

Some results of the experimental study of seismic anisotropy of sedimentary rocks using different types of waves

Brodov¹,

Evstifeyev²,

Karus³

et al. 1984

Geophysical Journal International

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“…Rocks are expected to be anisotropic for seismic waves (i.e., have propagation velocities that depend on direction) for several reasons: layering on a scale that is small in comparison to the wavelength (e.g., , Helbig, 1981, oriented cracks under tectonic loads (e.g., , orientation of grains or crystals and schistosity (to name just some of the possible agents). One of the first well-documented observations regarding P-waves and SH-waves showed discrepancies that could be explained as effects of anisotropy•the depths of key reflectors estimated on the basis of S-wave reflections differed from those estimated on the basis of P-wave reflections (Polskov et al, 1980). Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ 36 K. Helb[g clusive use of P-waves that show much smaller anisotropy effects than S-waves.…”

Section: Why Observe Shear Waves?mentioning

confidence: 98%

Shear-Wave Exploration

Danbom¹,

Domenico²

1987

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253 255 Index 271 Downloaded 06/25/14 to 134.153.184.170. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ COEDITORS FOREWORD Publication of a monograph composed of papers on seismic shear waves and their application to petroleum exploration was proposed by W. E. Laing in an October 19, 1983 letter to $. H. Ward, then the SEG Editor. Mr. Laing's stated objective for the mom)graph was to develop interest in shear-wave exploration by exposing geologists and geophysicists engaged in seismic data interpretation to its potential for determining lithology and discovering stratigraphic traps. Following SEG Executive Committee approval, the assigned coeditors solicited submittals from authors of pertinent papers presented at a Shear-wave Exploration Symposium in Midland, Texas on March 31 and April 1, 1984 and at the 1984 S EG Annual Meeting in Atlanta, Georgia, December 2-6. Most presentations at the symposium were expanded versions of those given at the 1983 SEG Annual Meeting in Las Vegas, Nevada, September 11-15. From 17 papers solicited, 14 are in the monograph. Of the included papers, eight were presented at the Shearwave Exploration Symposium and six were presented at the 1984 SEG Annual Meeting. Two additional papers were prepared especially for the monograph: an introductory paper by the coeditors and a comprehensive classified bibliography of papers concerning shear-wave exploration seismology compiled by R. A. Ensley. This monograph is the first volume under Geophysical Developments series, one of seven SEG special publication series. The seven series, proposed by the SEG Publications Committee, were accepted in principle by the SEG Executive Committee in February, 1986. Volumes in the Geophysical Developments series summarize recent advances in specific areas of geophysical exploration. They are intended to provide the status of technology in developing exploration methods that are of immediate interest to geophysicists.The coeditors express their gratitude to the authors for preparing and submitting papers and for their patience and diligence in making revisions resulting from manuscript reviews. In addition, the coeditors are grateful for the support and assistance provided by the Publication Staff at the Tulsa SEG Headquarters. In particular, we wish to acknowledge the substantial effort by Lynn Griffin, ABSTRACT Applicati{)n ()1' shear (S)-waves in seismic pe-tr{)lcum expl{)rati{)n is in a critical stage of devcl(•pment. Pr()pagati•)n ()f these waves and of the hist()rically applied c()mpressional (P)-waves in a sedimentary secti(•n are affected differently by r(•ck physical pr(•perties. Principally, propagati()n vcl(>city and, in turn, reflection amplitude ()t' P-waves is affected by b{)th rock incompressibility and rigidity, whereas, that of S-waves isat'l'ccted by r(>ck rigidity only. Because of this difference it is p()ssible, for example, to verify P-wave reflection amplitude variation due to pore fluid change (e.g., brine to a gas-brine mixture), that a...

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“…For SH-waves the zero-offset limit of the stacking velocity yields the velocity (or an rms version thereof) in a horizontal direction, which is always larger than the corresponding velocity in a vertical direction (see Levin 1978, Helbig 1979. Consequently, depths determined with arrival time and zero-offset limit of the stacking velocity are different for P-and SH-waves, and always larger for the latter (compare Polskov et al 1980). This effect is sometimes referred to as the "P-S event tie problem".…”

Section: Anisotropy Effectsmentioning

confidence: 99%

“…If the free vertical surface were confined to near-field dimensions (about one wavelength, for instance in the form of a vertical slit), a point source generating waves of all three polarizations could be obtained. This configuration is simulated in the technique described by Polskov, Brodov, Mironova, Michon, Garotta, Layotte and Coppens (1980), where the vertical slit is approximated by a sequence of cavities created by subsurface explosions. The method has withstood field tests, but no theoretical description of an explosive source close to a vertical slit exists yet so that one is forced to reason by analogy.…”

Section: Generation Of Shear Wavesmentioning

confidence: 99%

The Potential of Shear‐wave Observations*

Helbig

Mesdag²

1982

Geophysical Prospecting

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HELBIG, K. and MESDAG, C.S. 1982, The Potential of Shear-Wave Observations, Geophysical Prospecting 30, 41 3-43 1.Shear waves can today be generated and observed, though not with the flexibility and the technical standard of compressional waves, and they can be identified in seismograms by various means. Their potential lies not so much in their lower velocity (corresponding-for the same frequency-to shorter wavelength and higher resolution) but in the fact that they probe the earth with stresses and strains that differ from those of compressional waves. Full utilization of the information potential of shear waves, therefore, requires combined use of Pand S-waves.Complications in the combined use of different wave types should be regarded as opportunities to obtain additional information. A typical example is the observation that the depth of one and the same interface estimated on the bases of P-and SH-reflections, respectively, can differ significantly. This discrepancy may be due to the anisotropy of a finely layered medium. Under favorable circumstances some of the parameters describing this anisotropy can be deduced from the different depth estimates and the curvature of the squared-offset/squared-time representation of the different reflections. Since in anisotropic media vertically polarized shear waves are significantly different from horizontally polarized ones, the combined observation of all three waves opens up additional possibilities.

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Utilisation Combinee Des Ondes Longitudinales Et Transversales en Sismique Reflexion*

Cited by 18 publications

References 4 publications

Some results of the experimental study of seismic anisotropy of sedimentary rocks using different types of waves

Some results of the experimental study of seismic anisotropy of sedimentary rocks using different types of waves

Shear-Wave Exploration

The Potential of Shear‐wave Observations*

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