Diffraction and Specular Imaging for High-Resolution Seismic Interpretation
|Presented by: Bruno de Ribet, Technical Global Director, Paradigm
Featured Domain: Seismic Processing and Imaging
Featured Technologies: EarthStudy 360®
|Structural Dip Partial Stack (15-30 degrees) Barnett Shale depth slice 4500 ft.
Acquiring rich seismic data with wide azimuth and long offset is now a leading strategy for E&P companies seeking higher subsurface image quality, in order to gain a more accurate definition of prospects and existing reservoirs. This is particularly true from a structural framework perspective, as the accurate spatial identification of high-resolution geologic features like faults, natural fractures, and small scale subsurface heterogeneities can provide a pathway to higher permeability; therefore, they need to be characterized and mapped.
These features act as scattering sources for the wavefield propagating through the subsurface. The wavefield generated by these source points is identified as diffraction energy; their associated amplitude is much smaller than the amplitude of the actual interfaces between geological layers.
Although this type of energy is recorded during data acquisition, it is suppressed by conventional processing and standard imaging algorithms, where summations and averaging processes are applied and the structural information is lost. Current processing workflows focus on high specular amplitudes in order to enhance the continuity of seismic reflection events, thus improving the structural mapping of the subsurface. Consequently, in a traditional seismic interpretation workflow, some derived discontinuity attributes (e.g. coherence curvature or fault likelihood), may carry only partial information.
This presentation describes the decomposition of the wavefield into reflection and diffraction energy, and illustrates its benefits when complementing a traditional structural interpretation workflow, leading to an accurate, high-resolution, and high-certainty structural framework for risk-managed field development.
In this session, we will review the benefits of decomposing and separating the full wavefield into reflection and diffraction energy fields, providing interpreters with high-resolution subsurface images containing different types and scales of discontinuous geometrical objects. Our goal is to complement the traditional seismic interpretation workflow by integrating information relative to diffraction energy as another attribute to be interpreted.
In this session, you will learn about:
- A high-resolution interpretation workflow that delivers accurate delineation of faults and geologic features
- The benefits of using specular and diffraction imaging in your interpretation workflows
Bruno de Ribet is Technical Global Director at Paradigm. As a key subject matter expert, Dr. de Ribet advises on developing interpretation and reservoir characterization workflows that increase efficiency and take full advantage of the Paradigm suite of geophysical and geological innovations. He has more than 20 years of experience in the upstream oil and gas industry. Dr. de Ribet holds a Ph.D. in geophysics from the Institute du Physique du Globe, Paris University.