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Technical Content

Technical Abstract
SEG - Society of Exploration Geophysicists | Can Peng, Xuhui Luo, Diancheng Wang, and Jeshurun Hembd, CGG © 2018 SEG | October

We propose a post-migration 3D Q compensation process in the depth domain that is accurate for complex geological structures, accommodates complex Q models, and also provides flexibility in noise handling and spectral control that is critical to AVA recovery.

Technical Abstract
SEG - Society of Exploration Geophysicists | Thomas Latter, Malgorzata Gregory, Andrew Ratcliffe, Graham Roberts, Bingmu Xiao, Rhea Sood and Chris Purcell, CGG © 2018 SEG | October

Amplitude attenuation and phase distortion of seismic data are byproducts of the Earth’s anelasticity (Q). These effects are exacerbated under regions of anomalously high absorption, such as shallow gas, causing uneven illumination and migration artifacts. We present a case study from the Norwegian North ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Chang-Chun Lee, Jing Yang, CGG; Robert Chrisman, Jean-Paul Van Gestel, Mark Benson, BP © 2018 SEG | October

To improve image resolution in the vicinity of the well, 3D VSP data was acquired at the Atlantis field in the Gulf of Mexico to complement the existing towed-streamer and OBN data. Two unique data challenges require special consideration and innovative techniques in order ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Adriano Gomes, Zhuocheng Yang, CGG © 2018 SEG | October

We investigate the benefits of considering the effects of the Hessian matrix in the reflection FWI (RFWI) reflectivity, i.e., using least-squares RTM (LSRTM) to estimate the short-wavelength component of the model. In addition, a more efficient approach using single-iteration LSRTM, more specifically, using curvelet-domain ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Zhigang Zhang, Jiawei Mei, Feng Lin, Rongxin Huang, and Ping Wang (CGG) © 2018 SEG | October

Using full-waveform inversion (FWI) to update velocity models that contain salt bodies with high velocity contrasts is challenging. It is even harder if erroneous salt geometry is part of the velocity model. Shen et al. (2017) showed a successful FWI application that corrected some ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Robert Shank, Shane Carley, and George Rhoads, Chevron; Zhao Wang, Ji Qi, Yi Xuan and Min Yang, CGG © 2018 SEG | October

Imaged based Q-compensation coupled with FWI can solve for significant frequency and amplitude losses below shallow overburden absorptive geologic bodies. Applying Q-compensation to both the baseline and monitor 4D surveys improves the consistency of the 4D response, leading to more reliable placement of development ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Robert To, Jain Cai, Fong Cheen Loh, Barry Hung (CGG); Simon Wolfarth (BP) © 2018 SEG | October

In previous publications, a hybrid deblending flow was proposed in which the last step of residual guided noise attenuation using the Noise to Signal Ratio (NSR) map was employed. This flow was proven to be effective and efficient for many OBS surveys. However, due ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Zongying Gong, Xiaodong Wu, Yunung Nina Lin, CGG; Nick Benfield, and Juan Pi Alperin, Shell © 2018 SEG | October

A new non-linear tomographic inversion based method is put forward to resolve large velocity errors associated with complex geology which can cause poor imaging or migration artifacts. We propose to first create a series of trial-velocities from initial velocity by varying the values inside ...

Technical Abstract
SEG - Society of Exploration Geophysicists | Feng Lin, Biniam Asmerom, Rongxin Huang (CGG); Brad Kuntz, Carter Gehman, Mehmet Tanis (Hess) © 2018 SEG | October

Reservoir imaging under the triangular Conger salt remains very challenging even after significant velocity model building efforts in recent years. Continuity and focusing of reservoir reflectors are sub-optimal due to the subtle velocity errors from the Conger salt and its neighboring carapace, which are ...