Seismic wave attenuation in carbonates

Adam, Ludmila; Batzle, Michael; Lewallen, Kyle; Wijk, Kasper van

doi:10.1029/2008jb005890

Cited by 155 publications

(113 citation statements)

References 49 publications

(78 reference statements)

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“…P-wave amplitude anisotropy is more difficult to measure than velocity anisotropy, but it is shown here to be stronger than velocity anisotropy. In it lies a growing realization that amplitude information has strong potential in understanding the subsurface (Adam et al, 2009), even though reliable amplitude information is typically harder to obtain.…”

Section: Discussionmentioning

confidence: 99%

Noncontacting benchtop measurements of the elastic properties of shales

2013

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We evaluated a laser-based noncontacting method to measure the elastic anisotropy of horizontal shale cores. Whereas conventional transducer data contained an ambiguity between phase and group velocity measurements, small laser source and receiver footprints on typical core samples ensured group velocity information in our laboratory measurements. With a single dense acquisition of group velocity versus group angle on a horizontal core, we estimated the elastic constants c 11 , c 33 , and c 55 directly from ultrasonic waveforms, and c 13 from a least-squares fit of modeled to measured group velocities. The observed significant P-wave velocity and attenuation anisotropy in these dry shales were almost surely exaggerated by delamination of clay platelets and microfracturing, but provided an illustration of the new laboratory measurement technique. Although challenges lay ahead to measure preserved shales at in situ conditions in the lab, we evaluated the fundamental advantages of the proposed method over conventional transducer measurements.

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Section: Discussionmentioning

confidence: 99%

Noncontacting benchtop measurements of the elastic properties of shales

2013

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“…When these methods are applied to surface seismic data, with a much lower S/N than that in VSP data, only limited success would be expected (Dasgupta and Clark, 1998). Nevertheless, fit-forpurpose Q values are used routinely for lithological interpretation (Adam et al, 2009;Reine et al, 2009Reine et al, , 2012. The review papers by Campbell et al (2005) and Kaderali et al (2007) amply demonstrate the capacity of VSPs to deliver satisfactory results in an appropriate circumstance.…”

Section: Introductionmentioning

confidence: 99%

Stable Q analysis on vertical seismic profiling data

Wang

2014

GEOPHYSICS

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Vertical seismic profiling (VSP) provides a direct observation of seismic waveforms propagating to various depths within the earth's subsurface. The Q analysis or attenuation (1∕Q) analysis based on direct comparison between individual waveforms at different depths, however, suffers from the problem of instability commonly due to fluctuations inherent in the frequency spectrum of each waveform. To improve the stability, we considered frequency and time variations and conducted Q analysis on an integrated observation. First, we transformed the time-(or depth-) frequency-domain spectrum to a 1D attenuation measurement with respect to a single variable, the product of time and frequency. Although this 1D measurement has a higher signal-to-noise ratio than the 2D spectrum in the time-frequency domain, it can also be used to further generate a stabilized compensation function. Then, we implemented two Q-analysis methods by data fitting (in a least-squares sense) to either the attenuation measurement or the data-driven gain function. These two methods are theoretically consistent and practically robust for conducting Q analysis on field VSP data.

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“…Previous theoretical and experimental studies (e.g., Winkler and Nur, 1982;Akbar et al, 1993;Batzle et al, 2006;Adam et al, 2009) revealed a very strong sensitivity of the seismic waves to pore fluid properties in reservoir rocks. All of these papers conclude that seismic data have a great potential in determining these key physical parameters.…”

Section: Introductionmentioning

confidence: 99%

Fluid mobility in reservoir rocks from integrated VSP and openhole data

Zhubayev

Ghose

Jihai³

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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SUMMARYIn this study, we first estimate seismic velocity and attenuation dispersion from a comprehensive zero-offset vertical seismic profile (VSP) data acquired in China. These results, combined with openhole data acquired at the same location, provide experimental evidence that the seismic attenuation in rocks is dominated by a fluid-flow mechanism. The loss mechanism due to multiple scattering is found to be negligible. This implies that extraction of fluid mobility (permeability to viscosity ratio) in reservoir rocks using low frequency (10 to 150 Hz) seismic data should be possible. We present a methodology, based on poroelastic inversion using a rotated coordinate system and simulated annealing, to extract fluid mobility from combined VSP and openhole data. Finally, we compare layerspecific fluid mobility values, obtained using this approach, with independent fluid mobility measurements and estimates based on wireline openhole data.

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Seismic wave attenuation in carbonates

Cited by 155 publications

References 49 publications

Noncontacting benchtop measurements of the elastic properties of shales

Noncontacting benchtop measurements of the elastic properties of shales

Stable Q analysis on vertical seismic profiling data

Fluid mobility in reservoir rocks from integrated VSP and openhole data

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