Interpretation value of diffractions and sub-specular reflections – applications on the Zhao Dong field

Abstract

We provide an overview of integrated pre-stack depth migration and diffraction imaging for the Zhao Dong field, Bohai Bay, China. This field is highly compartmentalized by complex faulting and further characterized by channel systems, fractures and volcanic features. The objective of the diffraction imaging is to better define these small-scale features. Tools to facilitate interpretation include displays with pre-stack depth migration and diffraction images overlain in different colour scales, as well as a weighted blending of them into a single volume. An important concept is that of the sub-specular reflection, which is obtained alongside the pure diffraction image by applying ultra-weak specularity tapers. Tuning properties of elementary diffractor images together with sub-specular reflectors provide a decisive uplift of diffraction imaging for the interpreter.

Adaptive hybrid diffusion model using variational mode decomposition for edge preserving noise attenuation

“…Temporal and spatial random processes are always applied to describe seismic noise. After analysing the characteristics of seismic noise records in different environments and understanding the reason for its generation and regularity, researchers have proposed various methods for noise attenuation (Shen and Li, 2010; Cai et al ., 2011; Wang and Gao, 2014; Li et al ., 2016; Chen et al ., 2017; Pelissier et al ., 2017).…”