Yunfeng Li’s research while affiliated with CGG and other places

... Poole et al. (2013) proposed a global directional designature to address the signature variation from shot to shot by using an improved τ − p transform. To avoid these problems involving the transforms, Lee et al. (2014) estimated directivity directly from the source ghost-delay time and then applied the directional filters in the shot gather. ...

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Inversion-based directional deconvolution to remove the effect of a geophone array on seismic signal

... The 3D effect and severe aliasing expected in the Crossline direction must be addressed in order to fully utilize the side gun data. While 3D de-ghosting for side-gun data is not a new topic, especially in deep water regions (Wu et al. 2014, and, shallow water depths pose additional issues and challenges for side-gun data de-ghosting. Refraction energy arrives early with abnormally strong amplitudes and mixes with the shallow primary reflections, leading to substantially inaccurate p estimations for the primary energy. ...

Reference:

Improved Deep Target Reservoir Imaging with Broadband WATS Data in the East China Sea

... The acquisition using OBN and OBS can easily achieve wide azimuth, which is critical for improving the quality of prestack migration (Beaudoin and Ross, 2007). The full azimuth RTM can better image challenging targets such as subsalt structures (Li et al., 2014). ...

Reference:

Reverse time migration: A prospect of seismic imaging methodology

... In an ideal case of RTM, seismic data free of surface reflection are extrapolated from receivers, and purely downgoing waves are directly extrapolated from the source. This pre-processing procedure is also referred to as the deghost processing (Zhang et al., 2018), which can be implemented in various ways, for example the deghost processing in τ-p domain (Wang et al., 2013). On the other hand, as the development of advanced acquisition technology, the dual-sensor streamers can record both acoustic pressures and vertical particle velocities at the same location, as well as 4C datasets are available with ocean-bottom cables or nodes. ...

Reference:

The effect of free‐surface reflections on depth images for acquisition with buried sources and receivers: Investigation through the point spread function