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**Conference**

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**Concept Tag**

- acoustic wave equation (1)
- acquisition (1)
- acquisition system (1)
- ADR (1)
- ADR map (1)
- algorithm (2)
- amplitude (2)
- Angle domain illumination analysis (1)
- anisotropic resverse-time migration (1)
- annual international meeting (2)
- annual meeting (2)
- application (1)
- Artificial Intelligence (1)
- CDP (1)
- Computation (1)
- computational (2)
- configuration (1)
- constant velocity (1)
- conventional rtm (1)
- convolution (1)
- CPU resource (1)
- deeper region (1)
- directional illumination (1)
- domain boundary (1)
- domain illumination (1)
- domain method (1)
- eikonal equation solver (1)
- equation (1)
- FDM (1)
- FFT interpolation (1)
- field data (1)
- frequency (1)
- frequency band (1)
- FWI (1)
- geophysics (2)
- GPU (3)
- gradient (2)
- grid (1)
- grid size (1)
- hardware (1)
- high performance tti-rtm (1)
- illumination (2)
- illumination analysis (1)
- Imaging (1)
- imaging condition (1)
- Implementation (1)
- impulse response (1)
- initial velocity (1)
- inverse (1)
- inversion (1)
- job configuration (1)
- layer-stripping tti rtm (1)
- linear interpolation (1)
- main menu (1)
- media (1)
- migration (3)
- modeling (1)
- performance (1)
- post-processed conventional rtm (1)
- propagation (1)
- receiver (1)
- redatumed data (1)
- reference list (1)
- Reservoir Characterization (8)
- reservoir description and dynamics (1)
- Reverse Time Migration (1)
- reverse-time migration (1)
- RTM (4)
- RTM image (1)
- rtm inverse (1)
- salt boundary (1)
- SEG (4)
- Seg Seg (1)
- segseg houston 2013 (1)
- seismic processing and interpretation (1)
- source wavefield (1)
- source wavelet (1)
- stability (1)
- subsalt velocity (1)
- subsurface (1)
- synthetic seismogram (1)
- target horizon (1)
- th annual international (1)
- throughput (1)
- time derivative (1)
- time domain FWI (1)
- traveltime (1)
- true velocity (1)
- TTI (1)
- Tti Rtm (2)
- tti rtm image (1)
- tti vti (1)
- Upstream Oil & Gas (8)
- velocity model (2)
- velocity model building (1)
- visco-acoustic effect (1)
- Wave (1)
- Wave Equation (1)
- wavefield (4)
- Zhang (1)

**File Type**

**Summary**

We develop an efficient scheme of illumination analysis along a target horizon. With this scheme, we can calculate the Directional Illumination (DI) from the sources and the Acquisition Dip Response (ADR) along a target horizon in very short turnaround time. Therefore, it can be a useful tool to study the influence of the model (e.g. salt body) and the acquisition system (e.g. shot distribution and aperture size). The result can be a guide for acquisition design and model building. With the illumination map along the target horizon, it also is helpful for the interpretation in areas where the image amplitudes are not reliable. Here, we use the wave-equation based migration and local plane wave decomposition method to get the frequency domain illumination in the local angle domain. We pre-calculated and saved the angle domain Green’s function along the target horizon. These Green’s functions are reusable so that we can save a lot of computational and I/O cost. We use the 3D SEG/EAGE salt model and a real model example to demonstrate the validity of our method.

acquisition, acquisition system, ADR, ADR map, amplitude, Angle domain illumination analysis, annual meeting, CDP, directional illumination, domain illumination, illumination, illumination analysis, receiver, Reservoir Characterization, segseg houston 2013, subsurface, target horizon, Upstream Oil & Gas

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.70)

**SUMMARY**

Reverse time migration (RTM) suffers from low wavenumber noise especially above strong reflectors such as salt boundaries. The traditional method of removing the noise is applying low cut filtering, which could destroy real events. The inverse scattering imaging condition selectively removes the backscattering noise. We introduce a method of computing the inverse scattering weighting coefficient. Synthetic and field examples show that the inverse scattering imaging improves salt boundary imaging compared to post-processed conventional RTM. The complicated imaging algorithm requires more computing time. The main overhead comes from the increased amount of source wavefield data. By redistributing some of the data compression process to the GPU’s, we were able to reduce the run time overhead by 10% of the conventional RTM.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

The technology of using Tilted Transverse Isotropic Reverse Time Migration (TTI RTM) for subsalt velocity model building has been playing an important role in the seismic industry. Since TTI RTM is a computationally expensive technique, improving the program efficiency to meet the project turnaround schedule becomes a critical topic. In this paper, we will present an algorithm called "GPU based Layer Stripping TTI RTM". In layer stripping RTM, the model will be decomposed into two or more regions, horizontally. The wavefield redatuming for the top region wavefield will be saved as an input to the bottom region for RTM. In this approach, we do not need to repeat the shallow wavefield extrapolation; the grid size of the deeper migration can be increased and TTI RTM can be replaced by Vertically Transverse Isotropic (VTI) RTM, due to the fact that the dip field is not as sensitive in the deep region. This is a key to improving the efficiency of the RTM. The super parallelism of the GPU RTM plays another important role in the efficiency of the algorithm. In practice the application of GPU based layer stripping TTI RTM reduces the computation time by two orders of magnitude. In this paper, we will discuss some practical issues such as how to manage balancing the computer resources and the 3D data explosion of the redatumed wavefields.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Technology:

- Information Technology > Hardware (1.00)
- Information Technology > Graphics (1.00)

Anelastic properties of the earth cause frequency dependent energy attenuation and phase distortion in seismic wave propagation. It is preferred that these unwanted effects be corrected in a prestack depth migration. Zhang et al (2010) introduced a visco-acoustic wave equation in the time domain for isotropic media. This paper extends the visco-acoustic wave equation for anisotropic case, and develops visco-acoustic reverse time migration algorithm for VTI medium. To validate the proposed wave equation, wave propagation is simulated on a homogeneous viscous VTI medium using a finite difference method. The wavefield snapshot shows predicted frequency dependent attenuation and dispersion. Synthetic and field data examples are also given.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Yoon, Kwangjin (TGS) | Suh, Sang (TGS) | Cai, James (TGS) | Wang, Bin (TGS)

In this abstract, we describe how to improve time domain full waveform inversion using source wavelet convolution, windowed back propagation and source side illumination. Instead of estimating the source wavelet from field data, a user defined source wavelet can be convolved to field data. This convolution makes waveform matching between modeled and field data easier. Increasing time window applied to residual enables top down velocity update and reduces the possibility of being stuck at a local minimum. The balance of gradient value can be improved by the illumination compensation using the square of source side wavefield. Well balanced gradient helps FWI restore the absolute value of velocity. We apply this method to estimate migration velocities using 2D and 3D synthetic and real data examples.

Technology:

- Information Technology > Hardware (0.81)
- Information Technology > Graphics (0.71)

Technology:

- Information Technology > Hardware (0.79)
- Information Technology > Graphics (0.63)

Yoon, Kwangjin (TGS) | Suh, Sang (TGS) | Ji, Jean (TGS) | Cai, James (TGS) | Wang, Bin (TGS)

acoustic wave equation, equation, FDM, FFT interpolation, geophysics, gradient, grid, Implementation, impulse response, linear interpolation, performance, Reservoir Characterization, reservoir description and dynamics, seismic processing and interpretation, stability, Tti Rtm, tti rtm image, Upstream Oil & Gas, Wave, wavefield

Thank you!