Depth Domain Inversion Case Study in Complex Subsalt Area

Letki, L.P.; Tang, Jianming; Du, Xiaobo

doi:10.3997/2214-4609.201412915

Cited by 13 publications

(2 citation statements)

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“…Moving toward inversion using a 3D convolution operator for the modeling part is, however, now possible with RB (or FD) PSFs. Similarly, using a full-wavefield approach, Letki et al (2015) recently show that FD PSFs can compensate for illumination effects in a depth-domain inversion approach, giving better amplitudes leading to improved interpretation. In addition, turning the 1D inversion itself into a 3D RB-PSF constrained inversion, following the Buland and Omre (2003) inversion scheme, is also prototyped but not yet published because thorough testing toward benchmarked synthetics and actual PSDM data remain to be completed.…”

Section: Discussionmentioning

confidence: 98%

Ray-based seismic modeling of geologic models: Understanding and analyzing seismic images efficiently

et al. 2015

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Often, interpreters only have access to seismic sections and, at times, well data, when making an interpretation of structures and depositional features in the subsurface. The validity of the final interpretation is based on how well the seismic data are able to reproduce the actual geology, and seismic modeling can help constrain that. Ideally, modeling should create complete seismograms, which is often best achieved by finite-difference modeling with postprocessing to produce synthetic seismic sections for comparison purposes. Such extensive modeling is, however, not routinely affordable. A far more efficient option, using the simpler 1D convolution model with reflectivity logs extracted along verticals in velocity models, generates poor modeling results when lateral velocity variations are expected. A third and intermediate option is to use the various ray-based approaches available, which are efficient and flexible. However, standard ray methods, such as the normal-incidence point for unmigrated poststack sections or image rays for simulating time-migrated poststack results, cannot deal with complex and detailed targets, and will not reproduce the realistic (3D) resolution effects of seismic imaging. Nevertheless, ray methods can also be used to estimate 3D spatial prestack convolution operators, so-called point-spread functions. These are functions of the survey, velocity model, and wavelet, among others, and therefore they include 3D angle-dependent illumination and resolution effects. Prestack depth migration images are thus rapidly simulated by spatial convolution with detailed 3D reflectivity models, which goes far beyond the limits of 1D convolution modeling. This 3D convolution modeling should allow geologists to better assess their interpretations and draw more definitive conclusions.

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Section: Discussionmentioning

confidence: 98%

Ray-based seismic modeling of geologic models: Understanding and analyzing seismic images efficiently

et al. 2015

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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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Application of Seismic Motion Inversion Method in Depth Domain at the Early Stage of Development

Hao¹,

Zhang²,

Wang³

et al. 2022

Springer Series in Geomechanics and Geoengineering

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Depth Domain Inversion Case Study in Complex Subsalt Area

Cited by 13 publications

References 0 publications

Ray-based seismic modeling of geologic models: Understanding and analyzing seismic images efficiently

Ray-based seismic modeling of geologic models: Understanding and analyzing seismic images efficiently

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

Application of Seismic Motion Inversion Method in Depth Domain at the Early Stage of Development

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