Practical Migration, deMigration, and Velocity Modeling
by J. Bee Bednar
Duration: Two to three days
Intended Audience: Entry and Intermediate level
Prerequisites (Knowledge/Experience/Education Required): The course is designed to be followed by anyone with a broad geoscience background: no specific detailed foreknowledge is required, although a familiarity with geophysical terminology will be useful. The average student should be at the level of a good interpreter. Someone who regularly interprets seismic data in the effort to find hydrocarbons - this would of course include seismic data processors and first year geophysical graduates.
Each issue in these chapters is discussed in a practical, data-focused manner. Conclusions are supported through examples using carefully crafted synthetic or real seismic data. Geometrical descriptions and explanations are given preference to precise mathematical analyses. To the extent possible, geometric images and case studies are used in place of complex and cryptic mathematical analysis.
The pros and cons of migration algorithms are evaluated. Deficiencies are illustrated through examples and practical understanding of why limitations are present. The proper use of specific algorithms in both land and marine environments is made plain.
Acquisition geometry is shown to have a profound effect on precisely what can and cannot be achieved. This results in immediate answers to questions concerning optimization of acquisition geometries. While the answers may not be economically feasible they are the only ones that are fully consistent with mathematical assumptions.
Emerging and concurrent velocity analysis techniques are explained, compared, and quantified. The impact of geology and its inclusion in the imaging process is discussed.
The course ends with a detailed looked at the impact of focused business principles on data acquisition, processing, and imaging.