A comparison between time domain and depth domain inversion to acoustic impedance

Letki, L.P.; Darke, Kevin; Borges, Yan Araujo

doi:10.1190/segam2015-5897069.1

Cited by 13 publications

(3 citation statements)

References 2 publications

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“…[From Letki et al, 2015a] This technique was applied in other complex salt environments, including the subsalt area of the Brazilian Santos Basin (Letki et al, 2015b). In this case, the benefits of depth-domain inversion over time-domain inversion were particularly visible in areas of large structural dip variations, such as in the layered salt.…”

Section: Figure 1 -Gulf Of Mexico Subsalt Rtm Example: Acoustic Impedance Volume Derived With Conventional Time-domain Inversion (Top) Anmentioning

confidence: 99%

Experiences of image-domain least-squares migration for quantitative interpretation

Cavalca¹,

Fletcher²,

Bloor³

2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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Contents of this paper were reviewed by the Technical Committee of the 16 th International Congress of the Brazilian Geophysical Society and do not necessarily represent any position of the SBGf, its officers or members. Electronic reproduction or storage of any part of this paper for commercial purposes without the written consent of the Brazilian Geophysical Society is prohibited. ____________________________________________________________________ Least-squares migration can help reduce non-geological amplitude variations caused by uneven illumination. Herein, we apply least-squares migration in the image domain to recover acoustic or elastic properties. Dipdependent illumination and wavelet stretch effects are captured using point spread functions and mitigated through inversion in the image domain. We show how this approach, also referred to as depth-domain inversion, can efficiently account for illumination variations induced by different geological and acquisition settings, leading to higher-resolution and more reliable earth property estimates. We also show how the approach can be used to reconcile seismic vintages associated with different acquisition geometries for time-lapse analysis.

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Section: Figure 1 -Gulf Of Mexico Subsalt Rtm Example: Acoustic Impedance Volume Derived With Conventional Time-domain Inversion (Top) Anmentioning

confidence: 99%

Experiences of image-domain least-squares migration for quantitative interpretation

Cavalca¹,

Fletcher²,

Bloor³

2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…Fletcher et al (2012Fletcher et al ( , 2016 replaced the 1D wavelet in conventional time-depth inversion with the point spread functions of depth imaging processing, attaining direct seismic inversion in the depth domain [21,22]. Then this idea was applied to complex subsalt environments [25][26][27][28], depth-domain Q compensation [29], depth-domain deghosting [30], pre-stack depth-domain elastic inversion [31][32][33], 4D inversion in the depth domain [34], and enhanced quantitative interpretation [35]. However, solving the point spread function requires a long computation time and large storage space, and the accuracy of the solution is highly dependent on the accuracy of the built depth-domain velocity model.…”

Section: Introductionmentioning

confidence: 99%

A Wavelet Extraction Method of Attenuation Media for Direct Acoustic Impedance Inversion in Depth Domain

Sun,

Cai,

Yao

2024

Applied Sciences

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The seismic image produced by pre-stack depth migration is more accurate and has clearer geological significance than the time image. However, the waveform of the depth-domain seismic image is affected not only by depth-dependent velocity variation but also by media attenuation, resulting in strong spectral variation of depth-domain seismic data. Therefore, depth-domain seismic inversion is still challenging. We propose a wavelet extraction method of attenuation media based on the generalized seismic wavelet, to address this issue. Then, the estimated depth-domain wavelets were applied to the direct acoustic impedance inversion. First, we investigated the effect of attenuation media on depth-domain source wavelets and derived an analytical formula for the depth-domain wavelets of attenuation media. Next, the time-domain generalized seismic wavelet was extended to the depth domain, which was utilized to study the feasibility of using the generalized seismic wavelet to characterize the seismic wavelet of the depth-domain attenuation media. Based on the orthogonal matching pursuit, we propose a method to extract the depth-domain generalized seismic wavelet directly from depth-domain seismic data. Finally, we applied this method to the depth-domain direct acoustic impedance inversion of a 3D field data example. Tests on the synthetic and 3D field datasets show that the proposed method can correctly extract the depth-domain seismic wavelet of attenuation media and attain direct inversion of the depth-domain acoustic impedance with high accuracy. Therefore, our method is effective and has robust potential in reservoir characterization, fluid prediction, and attribute extraction in the depth domain.

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“…He utilized the pseudo-depth transformation with constant velocities to handle the wavelet estimation. Letki [2015] also documented a formulation of seismic inversion in the depth domain by using the gird of practical methods of optimization to capture the dip dependent spatial wavelet. Although this method could estimate more balanced acoustic impedance compared to the results in the time domain, the practical methods of optimization are not valid anymore in presence of strong boundaries and the results will not be reliable.…”

Section: Introductionmentioning

confidence: 99%

Amplitude variation with incident angle inversion for fluid factor in the depth domain

Sun

Zong

2019

Annals of Geophysics

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The development of Pre−stack depth migration makes the imaging of the subsurface structure in the depth possible, which set a foun− dation for the study of amplitude variation with incident angle (AVA) inversion. This leads to the increasing demanding of the seismic inversion methods in the depth domain for guiding reservoir characterization. However, the conventional seismic inversion methods in the time domain are not suitable in the depth domain due to the seismic wavelet in the depth domain is depth−variant and depending on medium velocity. To address this issue, we proposed a pragmatic seismic inversion method for fluid factor in the depth domain with amplitude variation with incident angle gathers by using a true−depth wavelet on the process of seismic inversion. This wavelet is es− timated by converting the time wavelet to the depth wavelet with seismic velocity. To guide the fluid discrimination, the proposed method directly estimates the fluid factor from the pre−stack seismic data and all the process of the method is implemented in the depth domain. To deal with the weak nonlinearity induced by the velocity, the Bayesian inference, the prior information and model constraint are in− troduced in this seismic inversion method. Tests on synthetic data show that the fluid factor can be well estimated reasonably even with moderate noise. The field data example illustrates the feasibility and efficiency of the proposed method in application and the estimated fluid factor and shear modulus are in good agreement with the drilling results.

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A comparison between time domain and depth domain inversion to acoustic impedance

Cited by 13 publications

References 2 publications

Experiences of image-domain least-squares migration for quantitative interpretation

Experiences of image-domain least-squares migration for quantitative interpretation

A Wavelet Extraction Method of Attenuation Media for Direct Acoustic Impedance Inversion in Depth Domain

Amplitude variation with incident angle inversion for fluid factor in the depth domain

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