Improvement of Seismic Images of Complex Tectonic Structure in Deep Water with Research-Level Processing Sequences
John Miller, Roland von Huene, 1986. "Improvement of Seismic Images of Complex Tectonic Structure in Deep Water with Research-Level Processing Sequences", Seismic Images of Modern Convergent Margin Tectonic Structure, Roland von Huene, Susan Vath, Christine Sperber, Bridgett Fulop, Lee Bailey, Monique Martin
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In multichannel seismic reflection record sections, clear imaging is accomplished largely by processing. The data acquired across ocean trenches, where water is from 5 to 8 km deep, the sea floor is irregular, and the geology is complex, must be processed with procedures not commonly used on data from the adjacent continental shelf. We have experimented to develop better processing with data from the eastern Aleutian Trench. One record is used here to illustrate the improvement possible. It contains a complex faulted fold at the base of the slope, and processing is made difficult by the opposing dips of faults and by the changing vergence of folds (Figure 2.1). Careful velocity analysis and a special processing sequence are needed to image the velocity-sensitive areas of these data. In our experience, clear imaging of complex structures is assured only when each step in the processing sequence is accompanied by an appropriate level of velocity analysis. Here we show the difference in imaging a complex structure in the spectrum between first-level or production processing and research-level processing.
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In 1980, A. W. Bally assembled and edited an innovative three-volume “picture and work” atlas of seismic reflection record sections. This compilation of more than 130 excellent seismic section reproductions provided much new data from the earth's subsurface. For petroleum geologists, academic scientists, and students, it is the field geologist's counterpart of outcrops and type sections. The smaller collection of seismic sections presented in this Studies 26 publication was inspired by Bally's atlas, and follows his general format and philosophy. The objective is to provide a reference series of sections for the earth sciences and a vehicle for continuing scientific dialogue relating to modern convergent margins. This publication's assembled sections represent a single facet of that dialogue by bringing together a series of exceptional seismic sections from the fronts of presently active convergent margins around the Pacific.